S7 PLC comms check to HMI (TP170A) on MPI

ISL_MAN · Aug 17, 2005

Is there a function in Step 7 for detecting communication failure between my S7 300 PLC and my HMI (TP170A) connected to the MPI port. I want the PLC to know if the communication fails.

jumpier · Aug 17, 2005

Hi ISL_MAN!
Check the area pointer in your ProTool project; on my version (italian language) i have a pointer named "co-ordination" used for check from the plc if the OP is connected. I think that this pointer is like as a random number. If this number don't change on you DB probably your panel is disconnected.

Bye, bye

ISL_MAN · Aug 17, 2005

I've got two area pointers Event messages and Date/Time can't see anthing related to co-ordination. Is this becuase of the type of OP unit i'm using.

jumpier said:
Hi ISL_MAN!
Check the area pointer in your ProTool project; on my version (italian language) i have a pointer named "co-ordination" used for check from the plc if the OP is connected. I think that this pointer is like as a random number. If this number don't change on you DB probably your panel is disconnected.

Bye, bye

jumpier · Aug 17, 2005

I'm sorry. Don't reading thtype of your OP.

Ok, try this way ...
With the Date/Time pointer, write a 6 word number your plc DB. Check continuously from your plc program if the time second change. If not, your connection failed

ISL_MAN · Aug 17, 2005

Thats worked a treat. Thanks

jumpier said:
I'm sorry. Don't reading thtype of your OP.

Ok, try this way ...
With the Date/Time pointer, write a 6 word number your plc DB. Check continuously from your plc program if the time second change. If not, your connection failed

ISL_MAN · Aug 18, 2005

Spoke to soon the way I did it I'd need to have my seconds displayed on every screen for the data change function to work. Still need some help please.

ISL_MAN said:
Thats worked a treat. Thanks

Johnny T · Aug 18, 2005

Can you not have the seconds on every screen? What about if you made the text colour the same as the background colour so no-one else could see it?

RMA · Aug 18, 2005

I've only used ProTool on PC-Stations, so I don't know whether a TP would also have a "Permanent Window" or not. If so put your seconds there they would always be on screen. Otherwise Johnny's idea sounds like the simplest solution.

jumpier · Aug 19, 2005

Also for me the Johnny's idea sounds like the simplest solution.

For example if you have a "permanent screen area" in your project,
is possible insert the data/time in the first screen (then hide it adjusting the foreg. and backg. color) and each time you made a new screen you have the variable on the "permanent screen area". In this way you insert only one time the data/time tag in your project.

S7 PLC comms check to HMI (TP170A) on MPI

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