c# communication with 1756ent

[wemissworld 0]

Hi,everyone! I want to write a program to communication with 1756ent module using c#,how can I do? I don't have any resources(eg protocol) !

[Nathan 7]

I would suggest going one of 2 options: 1. Write your program as an OPC client. You'll have to purchase the OPC server (RSLinx, Kepware, etc) separately and it will be configured to see the 1756ENBT. This is a good option if you want your program to be reuseable, particularly with other PLC types. 2. Buy a package like this. Archie from plctalk is working on a Sourceforge project that could eventually help you, but I don't think he's even started that one. Unfortunately, I'd be surprised if you got much free help in the way of code for what you're looking for. You can only play ball with what's available...

[wemissworld 0]

Thanks Nathan! The first product is using OPC,and OPC Server is RSLinx,the second product I do not want to use the OPC? Thanks again! Perhaps the protocol of AB PLC is not open,not like Schneider or Omron.

[Eddie Willers 2]

The EtherNet/IP protocol used by ControlLogix and the 1756-ENBT is open and published. There is a set of resources describing the use of the EtherNet/IP protocol on the A-B website: http://www.rockwellautomation.com/enabled/guides.html The general EtherNet/IP specification you get from the Open Device Vendors Association, www.odva.org. They maintain both the EtherNet/IP and DeviceNet specifications.

[wemissworld 0]

Thanks Eddie Willers!