both plc are not in standby mode, it is confirmed only one at time is in primary mode. suppose i have controller A in pri mode i can only read & write data to plc only if my standby is disconnected from network. if i disconnected the pri controller from network and connect the secondary controller to the network in this case now i can only read data from plc can't write to it which is good. but if i connect both pri and hotstandby controller to the network now i can only read. i have configure both NOE cards ip address to the 126.96.36.199 and i am writing to same ip address.
i am using 140 NOE 211 card and quantum 140 CPU 534.
i think my NOE didn't support Automatic IP swap over on Hotsatandy