Omron FQM1-MMP21, FQM1-CM001 Programming, Appendix A, Using Execution Results in NC and NO Inputs

Programming Appendix A

Since condition flags are shared by all instructions, make absolutely sure that they do not interfere with each other within a single ladder-diagram program. The following are examples.

1.Using Execution Results in NC and NO Inputs

The Condition Flags will pick up instruction B execution results as shown in the example below even though the NC and NO input bits are executed from the same output branch.

Incorrect Use

Instruction A

Reflects instruction A Condition Flag execution results. Example: =

Instruction B

Reflects instruction B Condition Flag execution results. Example: =

Make sure each of the results is picked up once by an OUTPUT instruction to ensure that execution results for instruction B will be not be picked up.

Correct Use

Reflects instruction A	Instruction A
execution results.
Condition Flag	C
Example: =
	Reflects instruction A
Condition Flag	execution results.
Example: =	D

C

Instruction B

D

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