Mitsubishi Electric MELSEC iQ-R Series User Manual page 398

Process cpu module

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Tracking transfer setting for the signal flow memory

By transferring the signal flow memory, operations of rising/falling instructions in the old control system are taken over to the

new control system even after system switching.

"Signal Flow Memory Tracking Setting" is set to "Transfer" by default. Transferring the signal flow memory is

recommended. For the operation not to transfer it, refer to the following.

Page 436 Instructions whose operations vary depending on tracking of the signal flow memory

■Tracking of individual POUs

The following table shows whether the signal flow memory is transferred or not for each POU.

: Transferred, : Not transferred, : No signal flow memory

Program block

Function block

Subroutine type

*1 To prevent the signal flow memory in the standby system from being overwritten in a both systems execution program, use a local FB.

When a global FB is used, the signal flow memory in the standby system is overwritten with the signal flow memory in the control

26 REDUNDANT FUNCTION

26.3 Tracking Transfer

Both systems program executions setting

Control system execution

Both systems executions

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