plc.myforum.ro

macroms · Junior 2 Joined: 17 Feb 2018 Posts: 32

Hi..I have question about ControlLogix5573 CPU. When the controllers are in redundant mode (i.e. CPU-A is Primary & CPU-B is SYNC), when I change the keyswitch of CPU-A to Program Mode the Run status of the CPU-A will off and also at the same time the Run Status of CPU-B will also off. Is this natural behavior of CPU or I have something missing in the configuration? Because in Siemens and Schneider PLC's it's not like this.

macroms · Junior 2 Joined: 17 Feb 2018 Posts: 32

1756-RM2 status in CPU-A is Primary and in CPU-B is Sync when I power off the CPU-A the CPU-B will become Primary so the switch-over is ok. But whichever is Primary when I transfer that keyswitch to program mode it must switch-over also am I right?