A Device is talking to BASIC MODULE over RS232 link and therefore to
AB PLC-5.
In this case with tester reading of data is OK . But in actual
sometimes data gets shifted to right or left in PLC.
i.e 1500,.01,.002 would be 500,.01,.002 or Space1500,.01,.002 and soemetimes
alright. This is a problem in PLC.
Please let me know the solution or remedy of this problem.

Regards
Sadhana Verma

 

If I understand you correctly you have a device connected to the DB module
which gathers information about a product and then processes and sends this
info to the PLC?
Are you passing the info item by item to the PLC? This can be a problem. You
are better of passing a set of data items from DB to PLC (that way you can
look after the handshaking required for the double buffering of the PLC-DB
interface).

Hugo