Mitsubishi Electric MELSEC iQ-R Series User Manual page 95

Setting method
To enable this setting, set the special relay and special register as follows.
1.
Check that the device/label access service processing setting is set to "Execute the Process as Scan Time Proceeds" or
"Set Processing Time". ( Page 88 Setting method)
2.
Set "AFFFH" for SD315 (Service processing constant wait status setting).
3.
Turn off and on SM315 (Service processing constant wait setting flag).
Because SM315 or SD315 is not latched, set it again after turning off and on the power or resetting.
■In redundant mode
• In backup mode, set SM315 (Service processing constant wait setting flag) and SD315 (Service processing constant wait
status setting) of the CPU module of the control system. The setting details of the CPU module of the control system are
reflected in the CPU module of the standby system by tracking transfer.
• In separate mode, set SM315 (Service processing constant wait setting flag) and SD315 (Service processing constant wait
status setting) of each CPU module.
Precautions
• This function is enabled only when "Execute the Process as Scan Time Proceeds" or "Set Processing Time" for the device/
label access service processing setting is set.
• When the constant scan is set, the operation will be that of when the constant scan is set regardless of the device/label
access service processing setting and the setting for the device/label access service processing constant wait function.
(The CPU module always processes one request during the END processing, and processes the remaining requests during
the waiting time for the next constant scan.)
8 RUNNING A PROGRAM
8.2 Scan Time
8
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