Modes of operation:

The three modes of operation which can be selected by the key switch of a processor are as follows:

RUN position mode

PROG position mode

REM position mode

RUN position mode:

To execute ladder program and activate output devices, the processor is made in RUN mode.

When a processor is in RUN mode, it disables online program editing and also prevents to change the processor mode using programmer interface device.

PROG position mode:

Here, the term PROG refers to program.

When the processor is in PROG mode, it secures the processor from scanning or executing the ladder program...

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Chapter 2, Problem 40RQ

Chapter 2, Problem 42RQ

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Programmable Logic Controllers

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