I'm trying to program the S7-200 PLC with S7 Micro/win. But I got in trouble in programming as follows: I can't detect the edge up and edge down-positive and negative transition, which is presented by its related function. And this makes my program not continue.

Does anybody face similar experience on this case?
Thanks.

 

If you would like to send a copy of you program I would be glad to look at it.

Thank you,

David Adams
Application Engineer
CONTROL PRODUCTS
[email protected]
334-567-2017 office
334-567-8614 fax
334-303-9499 cell

 

Hi,

I think the first think to understand is that this is a reasonably mature piece of kit, so the problem is unlikely to be with the PLC.

Try clearing the PLC and only adding one network - try an input through an edge up (P transition) to SET an output

%I0.0-----------[P]----------[ S %Q0.0 ]

Now make the input HIGH for a short while, and the Output will be latched ON

Right, why doesn't it work in your program?

Marc Sinclair
http://s7-200.germainesystems.eu