Micrologix 1500 to PLC5 msg command

jrs2563

Member
Join Date
May 2003
Posts
27
Hello...I'm looking for an answer to my programming problem here from the experts! Here is my problem.
I have a MicroLogix 1500 that is accumulating gas scfh data that I would like to
message to a PLC-5 controller via ethernet. In preliminary testing, I have
tried to msg 1 word of test data with the msg command from the
1500 configured as below:

This Controller: Chan 1(Integral)
Communication Command: PLC5 Write
Data Table: N7:15
Size in Elements: 1

Target Device:
Message Timeout: 5
Data Table Address: N7:250
Local Node Address: 10.103.97.180 Octal: (blank)
Local/Remote: Local

Everytime I verify the 1500 program, the Local Node Address goes back to 0. I can't figure out how to keep my ip address in there so I can communicate with the PLC-5 Processor via ethernet. Just for kicks I tested my msg abilities between 2 PLC-5 controllers, and had no problems. This is my first attempt tho at communication between this micrologix 1500 and a PLC-5.
Thanks, Jim
 
To connect the MicroLogix 1500 to Ethernet, you use a 1761-Net-ENI module. This module converts DF1 full duplex protocol to Rockwell's EtherNet/IP messaging protocol.

The MicroLogix still thinks it is using DF1 Full Duplex protocol, so it can only put a DF1 Full Duplex address into the message configuration, not an IP address. That's why when you enter an IP address, RSLogix 500 rejects it and puts a default DF1 address in the field.

The 1761-NET-ENI has a table of DF1 addresses/IP addresses inside. You can configure these with a utility or by sending a special address to the Net-ENI module.


This method is described in Chapter 5 of the 1761-NET-ENI User Manual.

You will also want to be sure that your PLC-5 controller supports the EtherNet/IP messaging protocol. Older PLC-5E controllers only supported the proprietary "CSPv4" protocol but all can be upgraded to support both messaging protocols.
 

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