Mitsubishi 00JCPU User Manual page 210

(4) Precautions
(a) Latch clear in the RUN status
The latch clear operation cannot be performed when the CPU module is in the RUN status.
(b) Latch clear enabled range
There are two kinds of latch range can be set in the Device tab of the PLC parameter dialog box: latch clear
operation enable and disable range.
Remote latch clear operation resets only the data set in the "Latch (1)" (latch clear operation enable range).
For the method for resetting the device data in the latch clear operation disable range, refer to Section
3.7(2)(c).
(c) Devices that are reset by the remote latch clear operation
Devices that are not latched are also reset when the remote latch clear operation is performed.
(d) In a redundant system where the Redundant CPU is used
1) When the "Both systems" item is not selected on the Remote operation screen
Remote latch clear operation is performed for only the CPU module in the system specified in the connection
target settings.
2) When the "Both systems" item is selected on the Remote operation screen
Remote latch clear operation is performed for both CPU modules in the control system and standby system.
Make sure to set the CPU modules in both systems in backup mode.
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