You may be able too accomplish what your looking for by using two U.S. Robotics (3com) Courier v.everything modems. These modems are fully programmable and work with dialup - or - in your case 2-wire lease line. While yours isn't a lease line, it essetially can be a "dry pair" as the...
First, thank you for the quick response.....
Let me see if I have this straight,
The OB's contain the logic to call the FB and FC's.
FC's would be used for basic device control, say if switch is ON turn ouput ON
FB's on the other hand, would be used to determine if a liquid level is greater...
I'm currently involved in a materials handling project using an s7-300 controller. I have done similar work in the past with AB and Modicon controllers.
Having started the project, I find myself questioning the use of FB's or FC's for certain parts. Then I question whether i'm headed in the...
