OPC Connectivity problem in AC500 Redundant System
I am Using PM590 CPU with redundant configuration. I am facing following problem.
CPU A:- Primary
CPU B:- Secondary
SCADA:- Compact HMI Rev 5.1
Data Syncronizing working OK. Switchover working when CPU A will stop from Keypad or from Automation Builder. and at that time Communication with SCADA on OPC is OK But
1. When Power of CPU A, CPU B will becam primary. at that time Communication with scada will breakdown. Same will happen when Download program in CPU after Hardware Configuration Change.
So what may be Problem??
Log-in to PLC B and check whether master variable fG_HA_PRIMARY is HIGH and whether dwG_HA_ServerAlive tag has an incrementing value. If master variable is not HIGH, then OPC server will disconnect from the PLC after few attempts. If master variable is HIGH and value in dwG_HA_ServerAlive tag is not incrementing, then this indicates that OPC server has not connected to the PLC.