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8.2.4 Scan synchronization specification
Whether to synchronize the link scan with the safety CPU module's sequence scan or not can be selected.
(1) Difference between asynchronous and synchronous settings
(a) Asynchronous setting
Link scan is performed asynchronously with the sequence scan of the safety CPU module.
Select this item to shorten input transmission delay time when sequence scan takes much time than link scan.
Note that output transmission delay time will become longer.
(b) Synchronous setting
Link scan is performed synchronously with the sequence scan of the safety CPU module. Select this item in the
following cases:
• To shorten output transmission delay time (Note that when sequence scan takes much time than link scan,
input transmission delay time will become longer.)
• To keep transmission delay time constant (In the PLC Parameter setting of the safety CPU module,
"Constant Scanning" must be set, and the sequence scan must be set to be performed at the specified
intervals.)
(2) Setting method
Scan synchronization is specified in Network Configuration Setting. ( Page 81, Section 7.3)