You can use system bit %S88 to reassign the master of the I/O points. When %S88 is set, the system triggers a 140CRA31908 switch over and assigns the role of I/O master to the other 140CRA31908. The system then resets %S88.

NOTE: In redundant 140CRA31908 module configurations, check the status of the redundant 140CRA31908 module before a switchover is triggered. If the redundant 140CRA31908 module is not healthy, the system does not allow the switchover (even if %S88 is set).