VISUAL BASIC AND ALLEN BRADLEY DF1 ?

[mfreese]

Does anybody have sample code for direct communications with an AB SLC500 processor using RS232?

Any tips are greatly appreciated.

 

[RobertDonlon]

In order to communicate via DF1 to visual basic you will have to have at least RS Linx installed. Once this is done you will be able to use DDE communication via VB to communciate to the PLC. Keep in mind you will have to define all the registers and I/O you wish to monitor via the VB app. I have a snippet of VB code which does the above but only monitors one timer register.

-Robert

 

[djs]

Hello;
You do not need RsLinx to communicate via DF1. DF1 is an "open" protocall, ie the commands are published. See the following link:

http://www.ab.com/manuals/cn/17706516.pdf

Using this refernece it is possible to write a routine is just about any language to communicate in DF1 over a serial port.