Event E121
Qualified person
Event message:
Multiple host LCU device conflict
Explanation:
The system has detected several LCUs (Local Control Units) that are configured with the "Master" role that are present in the network at the same time. To prevent system disturbances due to controller conflicts, the system has triggered an error and performed a safety shutdown.
Corrective measures:
Log into the configuration interface of each LCU device one after another and check and confirm the parameters "Device role" or "Master/Slave".
Ensure that within the entire system, exactly one device has this parameter set to "Master"; the parameter for all other devices must be set to "Slave".
Upon confirmation of the changes, the LCU device will be restarted automatically so that the configuration takes effect. Once the configuration takes effect, the system automatically restores operation following this error.