发表于:2001-11-15 10:29:00
2楼
Mr. Sun,
The method is based on the type, precision of the flow mether and communication.
If it is high precision and it use special communication protocol, so the flow meter can supply a lot of parameters to PLC/PC, you can read it from the accumulation valve parameter, it is very accuracy.
If it is use middle level precision and use traditional signal like 4 to 20 mA siganl, frequency signal, you should write PLC Program to calculate it. Do not forget to set some buttons in InTouch to execute RESET, START, STOP, ALARM etc. PLC program scan time is faster ( less than 10 ms) than commuinication with PC ( DDE is typical 1 second).
If it is low precision like flow switch, you can use PLC program or you can use InTouch script to save PLC memory.
Regards,
Raymond