I am trying to set up msg blocks to send data between a SLC 505 PLC and a CLX PLC over ethernet how d o I set it up on both ends to read and write data between the two. PLEASE HELP!!

Yes, it's possible. Yes, it's easy and straightforward.

You only need one MSG instruction to perform a Read or a Write operation. I recommend placing the MSG code in the controller with which you are most familiar.

If you want help troubleshooting a specific MSG command or data transfer problem, post details about it.

The best publication for using EtherNet/IP communications in the Logix family is the ENET-UM001 manual, titled "EtherNet/IP Modules in Logix 5000 Control Systems". It includes a section in Chapter 5 about configuring MSG instructions to SLC controllers.

There are also several Rockwell Automation Knowledgebase documents that expand on the User Manuals and give application examples. Try searching on the keywords "Ethernet SLC Logix MSG" and you will find a number of useful examples.

ENET-UM001 manual

Messaging from a SLC 5/05 Controller (channel 1) to a 1756-L1 Controller (via Ethernet).

RSLinx AB_ETHIP and Logix Ethernet Bridging.

ControlLogix to SLC5/05 Ethernet Messaging.

Thanks for the help it's appreciated I will give it a try. Pity that some of the knowledge base links are restricted to people with Tec-connect numbers.

If you have a choice, I'd do it over the CLX. It's not that I'm partial to CLX at all. It's just that if you try to go the other way, mapping CLX memory into SLC address space takes some extra steps. If you write your MSG instructions in the SLC, it's a very straightforward process. You just add a MSG instruction and fill out the form.