Mitsubishi Electric MELSEC iQ-R Series User Manual page 256

Precautions in redundant mode
The following describes precautions on this function in redundant mode.
■When the program which is not executed in the CPU module of the standby system in backup
mode is registered
If system switching from backup mode standby system or changing operation mode, the execution conditions of the program
that previously had not been executed are satisfied and the device test may be executed unintentionally. To prevent the
above, be careful with executing system switching and operation mode change. For example, they shall be executed after all
the registrations of the device test with execution conditions are released.
■Registration and release of registration of the device test with execution conditions during
online change
The registration or release of registration of the device test with execution conditions for the target system of online change
cannot be executed during online change to both systems or only one system.
■When the online change was executed in the state that the device test with execution
conditions is registered
The registration information of the device test with execution conditions in the system where the online change is executed
may be released according to the ON/OFF state of SM940 (Operation setting of the device test with execution conditions) or
the addition/deletion/change contents of the labels or programs.
■CPU module to connect to when the device test with execution conditions is executed
When the device test with execution conditions is executed, specify "Not Specified", "System A", or "System B" to the CPU
module to connected to. If the device test with execution conditions is registered in the state that the CPU module of the
control system or standby system to connect to is specified, the CPU module is changed by system switching, and the
registration of the device test with execution conditions cannot be released. In this case, change the CPU module to connect
to and release the registration again.
■When the tracking transfer is set
When the device test with execution conditions is registered to the CPU module of the standby system in the state that the
tracking transfer of devices/labels is set, if the execution conditions are satisfied, the device/label values are changed. The
devices/labels are overwritten using tracking transfer at END processing. When registering the device test with execution
conditions to the CPU module of the standby system, take the tracking transfer into consideration.
■When the device test with execution conditions is registered to the standby system
When the device test with execution conditions specifying buffer memory, link direct device, or direct access output of the
module on the extension base unit is registered in the standby system in a redundant system with redundant extension base
unit, the value of the device is not changed even if the execution conditions are satisfied.
19 TEST FUNCTION
254
19.2 Device Test with Execution Conditions