Citect vs A1S

[Pierre 1]

I was called the other day to solve a problem. I solved it but there is some other things that looked bizarre! I could not play with the system but saw this. The Citect SCADA system is flashing a COM error . So it means it has lost the comunication with the PLC BUT ... on the PLC com module the lights TX RX keep flashing. I don't thinck it has really lost it. The Citect SCADA has 2 station connected through Ethernet and a BIG database for trends and alarms (they keep up to a full year) but the database in on another PC. When I use the primairy station I never get this alarm. When I use the secondairy station the alarm goes on. It goes off about 5 seconds after it has gone ON. The TX-RX lights never scease to blink and I get no errors in the PLC. (Gee its hard to explain in english) Could that be that the SCADA just overshoot its allowed time for data retreival for dispaly and at this point looses com (internaly).