Function of PLC Operating system

Automation PLC
1

The function of PLC Operating system is:

  1. Loads the user program from programming device to program memory.
  2. To read status of input devices.
  3. To execute user program.
  4. To form and update input image table.
  5. As per the status of output image table controls the output devices.
  6. To provide user-friendly functions.
  7. This O.S. makes supervision over entire system, so O.S. programs are said to running in supervisory mode.

When the user completely enters his program in user memory, he transfers control from PROGRAM mode to RUN mode. In RUN mode the control of the whole system is transferred to operating system. Now operating system takes care of the whole system such that the whole system becomes automatic and appears as magic to users.

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