{"users":[{"id":1,"username":"Bharadwaj","name":"S Bharadwaj Reddy","avatar_template":"/user_avatar/ask.instrumentationtools.com/bharadwaj/{size}/9261_2.png","admin":true,"trust_level":4},{"id":2,"username":"santhosh","name":"santhosh","avatar_template":"/user_avatar/ask.instrumentationtools.com/santhosh/{size}/3558_2.png","moderator":true,"trust_level":3},{"id":6504,"username":"Khalil_BELGHIYATI","name":"Khalil BELGHIYATI","avatar_template":"/user_avatar/ask.instrumentationtools.com/khalil_belghiyati/{size}/8819_2.png","trust_level":0},{"id":18,"username":"vignesh","name":"vignesh","avatar_template":"/user_avatar/ask.instrumentationtools.com/vignesh/{size}/3557_2.png","moderator":true,"trust_level":2},{"id":1239,"username":"rao","name":"M Rao","avatar_template":"/user_avatar/ask.instrumentationtools.com/rao/{size}/3609_2.png","trust_level":1},{"id":6106,"username":"Ex0d1c","name":"Vasilis Sako","avatar_template":"/letter_avatar_proxy/v4/letter/e/47e85d/{size}.png","trust_level":0},{"id":5009,"username":"sivakavi_brao","name":"sivakavi brao","avatar_template":"/user_avatar/ask.instrumentationtools.com/sivakavi_brao/{size}/7836_2.png","trust_level":0},{"id":6240,"username":"Vasanth_R","name":"Vasanth R","avatar_template":"/user_avatar/ask.instrumentationtools.com/vasanth_r/{size}/8590_2.png","trust_level":0},{"id":6194,"username":"Sundhar","name":"Sundhar","avatar_template":"/user_avatar/ask.instrumentationtools.com/sundhar/{size}/8551_2.png","trust_level":0},{"id":6164,"username":"abdurrahmanahmad3738","name":"Abdurrahman Ahmad ","avatar_template":"/letter_avatar_proxy/v4/letter/a/858c86/{size}.png","trust_level":0},{"id":6122,"username":"Kaushal","name":"Kaushal","avatar_template":"/letter_avatar_proxy/v4/letter/k/a88e4f/{size}.png","trust_level":0},{"id":6140,"username":"Simba","name":"Simbarashe Dovi ","avatar_template":"/letter_avatar_proxy/v4/letter/s/7c8e57/{size}.png","trust_level":0},{"id":6110,"username":"Fandi_Razz","name":"Fandi Razz","avatar_template":"/user_avatar/ask.instrumentationtools.com/fandi_razz/{size}/8490_2.png","trust_level":0},{"id":6061,"username":"rajatdas","name":"rajat","avatar_template":"/letter_avatar_proxy/v4/letter/r/4af34b/{size}.png","trust_level":0},{"id":4843,"username":"Bensam","name":"Benard Mbugua ","avatar_template":"/user_avatar/ask.instrumentationtools.com/bensam/{size}/8369_2.png","trust_level":0},{"id":5902,"username":"Raul","name":"Villarreal Perez","avatar_template":"/user_avatar/ask.instrumentationtools.com/raul/{size}/8370_2.png","trust_level":0},{"id":5903,"username":"Ibrahimmj","name":"Ibrahim majnouni","avatar_template":"/user_avatar/ask.instrumentationtools.com/ibrahimmj/{size}/8371_2.png","trust_level":0},{"id":6005,"username":"Mohamed_Ashraf","name":"Mohamed Ashraf","avatar_template":"/user_avatar/ask.instrumentationtools.com/mohamed_ashraf/{size}/8364_2.png","trust_level":0},{"id":5936,"username":"Hasitha","name":"Hasitha umayanga","avatar_template":"/user_avatar/ask.instrumentationtools.com/hasitha/{size}/8388_2.png","trust_level":0},{"id":5848,"username":"Gunman","name":"Eugeniu Gangan","avatar_template":"/user_avatar/ask.instrumentationtools.com/gunman/{size}/8340_2.png","trust_level":0},{"id":5866,"username":"TD_Electronics","name":"TD Dran","avatar_template":"/user_avatar/ask.instrumentationtools.com/td_electronics/{size}/8351_2.png","trust_level":0},{"id":5115,"username":"AIS","name":"Kingsley Alexander","avatar_template":"/letter_avatar_proxy/v4/letter/a/58f4c7/{size}.png","trust_level":1},{"id":963,"username":"Mike","name":"Mike","avatar_template":"/user_avatar/ask.instrumentationtools.com/mike/{size}/3559_2.png","moderator":true,"trust_level":2}],"primary_groups":[],"flair_groups":[],"topic_list":{"can_create_topic":false,"more_topics_url":"/c/automation/plc/18?page=1","per_page":30,"top_tags":[{"id":56,"name":"siemens-plc","slug":"siemens-plc"},{"id":55,"name":"plc-questions","slug":"plc-questions"},{"id":3,"name":"formula","slug":"formula"}],"topics":[{"fancy_title":"Digital inputs vs Digital outputs","id":39598,"title":"Digital inputs vs Digital outputs","slug":"digital-inputs-vs-digital-outputs","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/0/035fdd6c2be00d983d49d9edffdb061b48501e56_2_824x1024.jpeg","created_at":"2026-05-19T01:33:14.103Z","last_posted_at":"2026-05-19T01:33:14.247Z","bumped":true,"bumped_at":"2026-05-19T01:33:14.247Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":":gear: Digital Inputs vs Digital Outputs — PLC Basics Every Engineer Must Know \nIn every PLC system, signals are divided into two main types :backhand_index_pointing_down: \n:green_circle: Inputs → Information coming INTO&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":125,"like_count":0,"has_summary":false,"last_poster_username":"Bharadwaj","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":1,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Analog vs digital inputs","id":39594,"title":"Analog vs digital inputs","slug":"analog-vs-digital-inputs","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/f/f773a48ce8d37fbe98766e5283bfe5e1fa2f3c84_2_824x1024.jpeg","created_at":"2026-05-16T02:53:44.520Z","last_posted_at":"2026-05-16T02:53:44.693Z","bumped":true,"bumped_at":"2026-05-16T02:53:44.693Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":":gear: Analog vs Digital Inputs — Basic but Very Important \nEvery PLC/DCS engineer must clearly understand this difference :backhand_index_pointing_down: \n\n:green_circle: Digital Input (DI)\n:right_arrow: Reads only 2 sta&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":59,"like_count":0,"has_summary":false,"last_poster_username":"Bharadwaj","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":1,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Types of PLCs — Quick Guide Every Engineer Should Know","id":39548,"title":"Types of PLCs — Quick Guide Every Engineer Should Know","slug":"types-of-plcs-quick-guide-every-engineer-should-know","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/d/d1d1ee6815dbd290be2a5440fcfd22cbdb8b1a5b_2_1024x571.jpeg","created_at":"2026-04-08T03:25:14.343Z","last_posted_at":"2026-04-08T03:25:14.506Z","bumped":true,"bumped_at":"2026-04-08T03:25:14.506Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":":gear: Types of PLCs — Quick Guide Every Engineer Should Know \nChoosing the right PLC is not about brand… \nIt’s about application, scalability, and architecture :backhand_index_pointing_down: \n:green_circle: Compact / Fi&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":77,"like_count":1,"has_summary":false,"last_poster_username":"Bharadwaj","category_id":18,"op_like_count":1,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":1,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Alarm keeps coming back after Acknowledged it","id":39546,"title":"Alarm keeps coming back after Acknowledged it","slug":"alarm-keeps-coming-back-after-acknowledged-it","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/1/169ca7dcfa916d23e4ab2d1ec43552d160e3a631_2_1024x571.jpeg","created_at":"2026-04-04T10:52:32.767Z","last_posted_at":"2026-04-04T10:52:32.918Z","bumped":true,"bumped_at":"2026-04-04T10:52:32.918Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":":police_car_light::warning: If an alarm keeps coming back after you’ve acknowledged it, :repeat_button: 9 times out of 10 the system is doing exactly what you told it to do :robot::check_mark: \nAlarm keeps coming back af&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":50,"like_count":0,"has_summary":false,"last_poster_username":"Bharadwaj","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":1,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Omron PLC &ldquo;INH &rdquo; LED is on and the output cards are not working","id":39337,"title":"Omron PLC \"INH \" LED is on and the output cards are not working","slug":"omron-plc-inh-led-is-on-and-the-output-cards-are-not-working","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":null,"created_at":"2025-12-17T05:05:04.089Z","last_posted_at":"2025-12-17T05:05:04.295Z","bumped":true,"bumped_at":"2025-12-17T05:05:04.295Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Let me explain why this happens and how to troubleshoot it step by step. \n\nWhat INH (Inhibit) Means in Omron PLC\nINH = Output Inhibit \nWhen INH is ON: \n\n\nPLC CPU is running \n\n\nProgram is executing \n\n\nAll or selected outp&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":146,"like_count":0,"has_summary":false,"last_poster_username":"santhosh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":2,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"4-20mA to 0-20mA in tiaportal","id":39315,"title":"4-20mA to 0-20mA in tiaportal","slug":"4-20ma-to-0-20ma-in-tiaportal","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":null,"created_at":"2025-11-13T05:34:36.427Z","last_posted_at":"2025-11-14T12:43:01.648Z","bumped":true,"bumped_at":"2025-11-14T12:43:01.648Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Hello, \nHow can I convert 4-20mA to 0-20mA in tiaportal?","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":131,"like_count":0,"has_summary":false,"last_poster_username":"santhosh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":6504,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":2,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"CompactLogix PLC went to Fault Mode","id":39266,"title":"CompactLogix PLC went to Fault Mode","slug":"compactlogix-plc-went-to-fault-mode","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":null,"created_at":"2025-10-28T04:56:58.117Z","last_posted_at":"2025-10-28T04:57:46.562Z","bumped":true,"bumped_at":"2025-10-28T04:57:46.562Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Rockwell PLC 1769-L19ER  went into fault mode. After clearing from the studio 5000, PLC came to run mode. But the digital inputs and outputs were not set. I.e., LED not turned ON. why?","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":131,"like_count":0,"has_summary":false,"last_poster_username":"santhosh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":2,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Siemens PLC Totalizer Program in Tia Portal","id":39253,"title":"Siemens PLC Totalizer Program in Tia Portal","slug":"siemens-plc-totalizer-program-in-tia-portal","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/original/2X/1/1294b6fb336e67a924a6559aa55e7f60ecdfff07.jpeg","created_at":"2025-10-22T04:02:34.609Z","last_posted_at":"2025-10-22T04:02:34.740Z","bumped":true,"bumped_at":"2025-10-22T04:02:34.740Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Developed a flow totalizer logic in TIA Portal using OB30 for precise time-based integration. \nThe analog input from the flow transmitter is first processed through Norm_X → Scale_X to obtain the flow rate, which is then&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":157,"like_count":0,"has_summary":false,"last_poster_username":"santhosh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":2,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"250 Ohm Resistor in PLC","id":39001,"title":"250 Ohm Resistor in PLC","slug":"250-ohm-resistor-in-plc","posts_count":3,"reply_count":0,"highest_post_number":3,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/2/24b3a65dee15426df4d99f43f8d1ab5a63d459e7_2_1024x690.jpeg","created_at":"2025-06-03T11:01:30.724Z","last_posted_at":"2025-08-27T13:28:19.549Z","bumped":true,"bumped_at":"2025-08-27T13:28:19.549Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Sir, is the 250 Ohm resistor typically inbuilt within the barriers located in the marshalling cabinet, or is it provided inside the PLC/DCS I/O modules? In cases where barriers are not used, where should the resistor be &hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":482,"like_count":3,"has_summary":false,"last_poster_username":"rao","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":18,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":1239,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"My thesis on &ldquo;Simulation of an Automated warehouse operation using PLC and SCADA &rdquo;","id":38484,"title":"My thesis on \"Simulation of an Automated warehouse operation using PLC and SCADA \"","slug":"my-thesis-on-simulation-of-an-automated-warehouse-operation-using-plc-and-scada","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/b/b15037982fde1044f5eaef6babdeab64e3cd0213_2_1024x576.jpeg","created_at":"2024-10-01T21:13:12.854Z","last_posted_at":"2025-08-27T13:19:11.815Z","bumped":true,"bumped_at":"2025-08-27T13:19:11.815Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"My thesis on &quot;Simulation of an Automated warehouse operation using PLC and SCADA &quot; with the use of TIA Portal and Factory IO. \nThe simulation includes: \nImporting the 3 types of boxes into the system in buckets on pallet&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":156,"like_count":1,"has_summary":false,"last_poster_username":"rao","category_id":18,"op_like_count":1,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":6106,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":1239,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Steps to Add CP 343-1 Lean to Your Existing PLC","id":38816,"title":"Steps to Add CP 343-1 Lean to Your Existing PLC","slug":"steps-to-add-cp-343-1-lean-to-your-existing-plc","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":null,"created_at":"2025-02-02T11:03:58.107Z","last_posted_at":"2025-02-02T11:03:58.200Z","bumped":true,"bumped_at":"2025-08-20T10:37:35.738Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Adding a CP 343-1 Lean to your existing Siemens S7-300 PLC system (with CPU 314) requires careful configuration and setup. Below is a step-by-step guide to help you integrate the CP 343-1 Lean module successfully: \n\nStep&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[{"id":56,"name":"siemens-plc","slug":"siemens-plc"}],"tags_descriptions":{},"views":234,"like_count":0,"has_summary":false,"last_poster_username":"vignesh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"What is minimum scan time in PLC?","id":9903,"title":"What is minimum scan time in PLC?","slug":"what-is-minimum-scan-time-in-plc","posts_count":3,"reply_count":0,"highest_post_number":3,"image_url":null,"created_at":"2020-02-08T16:07:35.773Z","last_posted_at":"2023-07-11T02:46:18.207Z","bumped":true,"bumped_at":"2025-05-23T04:33:32.183Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"PLC minimum scan time","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":1458,"like_count":1,"has_summary":false,"last_poster_username":"santhosh","category_id":18,"op_like_count":1,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":18,"primary_group_id":null,"flair_group_id":null},{"extras":null,"description":"Recent Poster","user_id":5009,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":2,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Want to know if your PLC program is secretly failing?","id":38957,"title":"Want to know if your PLC program is secretly failing?","slug":"want-to-know-if-your-plc-program-is-secretly-failing","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/2/2530a86afa77e3d84b38a8ec56d1b4daf86bf374_2_1024x534.jpeg","created_at":"2025-05-01T04:18:10.905Z","last_posted_at":"2025-05-01T04:18:10.995Z","bumped":true,"bumped_at":"2025-05-02T04:25:19.767Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Warning signs of poor PLC programming practices. \nAfter 15+ years of troubleshooting automation nightmares, \nI’ve seen countless PLC programs fail catastrophically. \n  \nHere’s what most engineers miss… \nMany believe \n“If&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":134,"like_count":0,"has_summary":false,"last_poster_username":"vignesh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"100 PLC interview questions with detailed answers","id":38754,"title":"100 PLC interview questions with detailed answers","slug":"100-plc-interview-questions-with-detailed-answers","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/b/be26e7ec7fc83af42dfe0c72581f0bf6e8d4132b_2_1024x597.jpeg","created_at":"2025-01-28T05:21:40.265Z","last_posted_at":"2025-01-28T05:21:40.308Z","bumped":true,"bumped_at":"2025-01-28T05:28:50.810Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Here are 100 PLC interview questions with detailed answers. These questions cover a wide range of topics, including basic concepts, programming, troubleshooting, and advanced applications. \nPLC interview questions\n  \n\nBa&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":635,"like_count":1,"has_summary":false,"last_poster_username":"vignesh","category_id":18,"op_like_count":1,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"25 MCQs on PLC","id":38753,"title":"25 MCQs on PLC","slug":"25-mcqs-on-plc","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":null,"created_at":"2025-01-28T05:17:24.428Z","last_posted_at":"2025-01-28T05:17:24.508Z","bumped":true,"bumped_at":"2025-01-28T05:17:24.508Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Here are 25 Multiple Choice Questions (MCQs) on Programmable Logic Controllers (PLCs). These questions cover basic concepts, programming, and applications of PLCs: \nMCQs on PLC\n\nBasic Concepts\n\n\nWhat does PLC stand for? \n&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":175,"like_count":0,"has_summary":false,"last_poster_username":"vignesh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Licence key","id":38745,"title":"Licence key","slug":"licence-key","posts_count":4,"reply_count":1,"highest_post_number":4,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/3/376ec96ab01924b91ea612c811f39102b6c983bc_2_1024x577.jpeg","created_at":"2025-01-24T17:54:20.757Z","last_posted_at":"2025-01-26T05:15:49.000Z","bumped":true,"bumped_at":"2025-01-26T05:15:49.000Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"I am trying to install the licence key for SIMATIC PCS7 and SIMATIC WINCC from EKB software. But, I couldn’t download the licence key.","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":218,"like_count":0,"has_summary":false,"last_poster_username":"Vasanth_R","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest","description":"Original Poster, Most Recent Poster","user_id":6240,"primary_group_id":null,"flair_group_id":null},{"extras":null,"description":"Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Control Variable Frequency Drive with Programmable Logic Controller","id":38703,"title":"Control Variable Frequency Drive with Programmable Logic Controller","slug":"control-variable-frequency-drive-with-programmable-logic-controller","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/original/2X/2/278326ea85c97f69ae1f62c4dd2ecdd4838235b2.jpeg","created_at":"2025-01-01T14:54:36.150Z","last_posted_at":"2025-01-01T14:54:36.207Z","bumped":true,"bumped_at":"2025-01-01T14:54:36.207Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"There are five ways to control a Variable Frequency Drive (VFD) with a Programmable Logic Controller (PLC): \nAnalog Signal Control (0-10V/4-20mA)\n\nPLC outputs analog signal: 0-10V or 4-20mA.\nVFD receives signal: Adjusts &hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":255,"like_count":0,"has_summary":false,"last_poster_username":"vignesh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Free PLC Programming Training for Beginners","id":38682,"title":"Free PLC Programming Training for Beginners","slug":"free-plc-programming-training-for-beginners","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/e/e3505cb09ebd6ab00d37246f400ebb5d9856f39b_2_1024x575.png","created_at":"2024-12-24T10:24:25.804Z","last_posted_at":"2024-12-30T04:42:22.087Z","bumped":true,"bumped_at":"2024-12-30T04:42:22.087Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Dreaming of mastering industrial automation? Our Free PLC Programming Training for Beginners is here to help you take the first step toward a successful career in automation and control systems. \n\nWhy Learn PLC Programmi&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":590,"like_count":1,"has_summary":false,"last_poster_username":"vignesh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":2,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"ITC2200 Hanging issue","id":38648,"title":"ITC2200 Hanging issue","slug":"itc2200-hanging-issue","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":null,"created_at":"2024-12-19T09:06:33.354Z","last_posted_at":"2024-12-20T04:26:50.967Z","bumped":true,"bumped_at":"2024-12-20T04:26:50.967Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"In ITC2200 There was a hanging issue and very slow. how to solve the problem","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[{"id":56,"name":"siemens-plc","slug":"siemens-plc"}],"tags_descriptions":{},"views":99,"like_count":0,"has_summary":false,"last_poster_username":"santhosh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":6194,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":2,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"What is the function of plc","id":38568,"title":"What is the function of plc","slug":"what-is-the-function-of-plc","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":null,"created_at":"2024-11-20T08:35:05.701Z","last_posted_at":"2024-11-26T10:59:01.452Z","bumped":true,"bumped_at":"2024-11-26T10:59:01.452Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"What is the function of plc in communication","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":147,"like_count":1,"has_summary":false,"last_poster_username":"santhosh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":6164,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":2,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Criteria to choose appropriate PLC for process","id":38513,"title":"Criteria to choose appropriate PLC for process","slug":"criteria-to-choose-appropriate-plc-for-process","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/3/3a1ab54ad3e066d0fabd78dc35356bbd2536c9c8_2_1024x635.jpeg","created_at":"2024-10-19T08:53:03.091Z","last_posted_at":"2024-11-05T00:03:54.570Z","bumped":true,"bumped_at":"2024-11-05T00:13:56.614Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"I want to integrate 22 XV on/off valves, 9 motors (on/off), 3 LT, 3 pH, and 7 flow meters so what should be the technical specs of PLC for integrating all the hardware and making the process automated. \nGive insights in &hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":165,"like_count":0,"has_summary":false,"last_poster_username":"vignesh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":6122,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Can you please explain PLC PNP and NPN Wiring?","id":38538,"title":"Can you please explain PLC PNP and NPN Wiring?","slug":"can-you-please-explain-plc-pnp-and-npn-wiring","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/original/2X/f/ff01d663a7ffcd9f75dca06195333bbfef6fe95b.jpeg","created_at":"2024-10-31T16:02:31.916Z","last_posted_at":"2024-11-04T06:14:36.948Z","bumped":true,"bumped_at":"2024-11-04T06:20:50.099Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Can you please explain what’s going on here in the PLC wiring diagram below?","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":277,"like_count":2,"has_summary":false,"last_poster_username":"vignesh","category_id":18,"op_like_count":1,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":6140,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":18,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Free PLC Simulation Software Download","id":6216,"title":"Free PLC Simulation Software Download","slug":"free-plc-simulation-software-download","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/e/efe780f4f759464caaa941c4fb93e8ff800d699b_2_1024x617.jpeg","created_at":"2018-10-16T13:17:58.006Z","last_posted_at":"2024-10-06T16:37:44.318Z","bumped":true,"bumped_at":"2024-10-06T16:37:44.318Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"The following are the available online PLC Simulation Software Download Links. \n  \nPLC Simulation Software’s\nPLCs.net - FREE Online PLC Simulator \nPLC Simulator - Free from TheLearningPit.com \nTheLearningPit - PLC Simula&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":5090,"like_count":1,"has_summary":false,"last_poster_username":"Fandi_Razz","category_id":18,"op_like_count":1,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":18,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":6110,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Connecting two siemens plc using plcsim with factory IO","id":38423,"title":"Connecting two siemens plc using plcsim with factory IO","slug":"connecting-two-siemens-plc-using-plcsim-with-factory-io","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":null,"created_at":"2024-08-28T08:47:28.865Z","last_posted_at":"2024-09-02T09:36:58.291Z","bumped":true,"bumped_at":"2024-09-02T09:36:58.291Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Hi how to connect two PLC with factory IO simultaneously via plcsim or any other simulator ?","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[{"id":56,"name":"siemens-plc","slug":"siemens-plc"}],"tags_descriptions":{},"views":156,"like_count":0,"has_summary":false,"last_poster_username":"santhosh","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":6061,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":2,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"PLC and HART communicator showing different values? Reason?","id":38161,"title":"PLC and HART communicator showing different values? Reason?","slug":"plc-and-hart-communicator-showing-different-values-reason","posts_count":5,"reply_count":1,"highest_post_number":5,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/original/2X/b/ba602a1696f4e77099437fae16511cb3d2e96469.jpeg","created_at":"2024-05-23T01:14:03.985Z","last_posted_at":"2024-05-23T21:12:32.345Z","bumped":true,"bumped_at":"2024-08-13T00:27:16.677Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"User Question: \nI wanted to reach out because I have been having some challenges with figuring out the value and scaling that read from a differential pressure transducer. \nIt is a Yokogawa EJA110A-EM and the value I see&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":1311,"like_count":2,"has_summary":false,"last_poster_username":"Ibrahimmj","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":2,"primary_group_id":null,"flair_group_id":null},{"extras":null,"description":"Frequent Poster","user_id":4843,"primary_group_id":null,"flair_group_id":null},{"extras":null,"description":"Recent Poster","user_id":5902,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":5903,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"100 Important PLC Projects for Engineering Students","id":6985,"title":"100 Important PLC Projects for Engineering Students","slug":"100-important-plc-projects-for-engineering-students","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":"https://ask.instrumentationtools.com/uploads/db4532/optimized/2X/6/6eaad7c8bc5d4684984ec4c82300c3db564c900f_2_1024x610.jpeg","created_at":"2018-12-14T16:29:57.494Z","last_posted_at":"2024-07-25T06:58:18.601Z","bumped":true,"bumped_at":"2024-07-25T06:58:18.601Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"100 Important PLC Projects for Engineering Students\nSome PLC based project ideas\n1.  PLC BASED MANLESS RALIWAY GATE CROSIING. \n2.  PLC BASED AUTOMATIC CAR PARKING SYSTEM-MULTI LEVEL. \n3.  PLC BASED AUTOMATIC FIRE FIGHTIN&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":3649,"like_count":2,"has_summary":false,"last_poster_username":"Mohamed_Ashraf","category_id":18,"op_like_count":2,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":18,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":6005,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Xinji PlC","id":38210,"title":"Xinji PlC","slug":"xinji-plc","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":null,"created_at":"2024-06-12T15:15:36.718Z","last_posted_at":"2024-06-12T15:15:36.813Z","bumped":true,"bumped_at":"2024-06-12T15:15:36.813Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Is anyone familiar with the ladder program for Xinji PLC to connect a load cell indicator via RS485? When the load value changes, it should be displayed on the ladder program. I am using the XD3-24RT and the Mypin LM ser&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":354,"like_count":0,"has_summary":false,"last_poster_username":"Hasitha","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":5936,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Allen-Bradley visualization architecture (SiVArc analogue)","id":38162,"title":"Allen-Bradley visualization architecture (SiVArc analogue)","slug":"allen-bradley-visualization-architecture-sivarc-analogue","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":null,"created_at":"2024-05-23T01:30:26.984Z","last_posted_at":"2024-05-23T01:30:27.099Z","bumped":true,"bumped_at":"2024-05-23T01:30:27.099Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Dear community, \nI am trying to find a tool for Allen-Bradley PLCs similar to SiVArch for Siemens PLCs to automatically generate faceplates and connect them to the correct tags based on predefined rules. Does anybody kno&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":326,"like_count":0,"has_summary":false,"last_poster_username":"Gunman","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":5848,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"IC2 in OpenPLCEditor","id":38064,"title":"IC2 in OpenPLCEditor","slug":"ic2-in-openplceditor","posts_count":1,"reply_count":0,"highest_post_number":1,"image_url":null,"created_at":"2024-04-28T16:13:10.421Z","last_posted_at":"2024-04-28T16:13:10.477Z","bumped":true,"bumped_at":"2024-04-28T16:13:10.477Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Hello, I am new to OpenPLCEditor, I’ve learnt to do some simple projects over there but I cant seem to figure out how to use LCD 16x2 with IC2. \nMy program supposed to work like this, very simple. \nIf sensor detects, LCD&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":434,"like_count":0,"has_summary":false,"last_poster_username":"TD_Electronics","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":"latest single","description":"Original Poster, Most Recent Poster","user_id":5866,"primary_group_id":null,"flair_group_id":null}]},{"fancy_title":"Bottle filling","id":37027,"title":"Bottle filling","slug":"bottle-filling","posts_count":2,"reply_count":0,"highest_post_number":2,"image_url":null,"created_at":"2023-08-30T12:55:27.024Z","last_posted_at":"2023-09-06T02:13:45.829Z","bumped":true,"bumped_at":"2024-03-22T17:02:46.259Z","archetype":"regular","unseen":false,"pinned":false,"unpinned":null,"excerpt":"Good day All \nI am designing a bottle filling line to fill 250 mL bottles of drinking water. \nMy challenge is to find the right sensor to check the fill level (Height) in the each bottle to trigger the shut-off of the fi&hellip;","visible":true,"closed":false,"archived":false,"bookmarked":null,"liked":null,"tags":[],"tags_descriptions":{},"views":1081,"like_count":0,"has_summary":false,"last_poster_username":"Mike","category_id":18,"op_like_count":0,"pinned_globally":false,"featured_link":null,"is_hot":false,"has_accepted_answer":false,"can_vote":false,"posters":[{"extras":null,"description":"Original Poster","user_id":5115,"primary_group_id":null,"flair_group_id":null},{"extras":"latest","description":"Most Recent Poster","user_id":963,"primary_group_id":null,"flair_group_id":null}]}]}}