We have intouch 9.5 HMI project. PC with this project connected to 10 siemens PLCs (S7-300) through DASS7. If connection to any PLC is lost (for example cable is broken) HMI still displays the last actual values of tags of this PLC and operator doesnt know that connection to PLC is lost.
Question: how to reset to "0" the values of tags of PLC when connection to it is lost? Is any simple way to do this in intouch or DASS7?
Sorry for my english.
[?]Intouch and DASS7 behavior when connection to PLC is lost
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chernovtsev
- Posts: 5
- Joined: Tue Apr 15, 2008 9:25 am
- Location: Ukraine
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bunglehead
- Posts: 109
- Joined: Thu Oct 19, 2006 7:00 am
- Location: Russia
You shouldn't do that. Use .Quality dotfield to check if point's available or not. Use visibility animation to hide values and display something like "???" when .Quality < 192.
And you have to check something like PLC Watchdog to detect connection loss and raise an alarm.
It's a general and clear solution.
And you have to check something like PLC Watchdog to detect connection loss and raise an alarm.
It's a general and clear solution.