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26 REDUNDANT FUNCTION
26.3 Tracking Transfer
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
*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
system.
POU Both systems program executions setting
Control system execution Both systems executions
Program block
Function block Macro type
Subroutine type Global FB
*1
Local FB
Function
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