[?]Intouch and DASS7 behavior when connection to PLC is lost

Прочие SCADA: iFix, InTouch, Citect, ...
Post Reply
chernovtsev
Posts: 5
Joined: Tue Apr 15, 2008 9:25 am
Location: Ukraine

[?]Intouch and DASS7 behavior when connection to PLC is lost

Post by chernovtsev » Fri Apr 18, 2008 7:34 am

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.

bunglehead
Posts: 109
Joined: Thu Oct 19, 2006 7:00 am
Location: Russia

Post by bunglehead » Fri Apr 18, 2008 11:13 am

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.

Post Reply