HP MicroLogix 1761-NET-ENI manual Configuring 1761-NET-ENI #2, Message Routing Nodes Function

7-6Connecting 1769-L20 CompactLogix Controllers on Ethernet

Configuring 1761-NET-ENI #2

Then, connect the serial cable between your computer and ENI #1 and click on the ENI IP Addr tab. From this tab, under the “Save To” column, click the ENI ROM button. This will download your configuration parameters to ENI #1 and save it to non-volatile memory.

ENI #2 is connected to the L20 controller. This ENI must be configured with its own IP address (131.200.50.94 for this example) and we must add the IP addresses of the SLC 5/05 controller and the

1756-ENET/5550 controller to its Message Routing table. The Message Routing table allows for up to 50 IP addresses to be linked to DF1 destination node addresses, for the following purposes:

Table 7.2 Message Routing

Nodes	Function
Nodes 0 to 44	When sending messages to any Ethernet device, other than
	ControlLogix, that supports the same command set as the 1769-L20
	controller, i.e. SLC 5/05, PLC-5E and other ENI modules. We will
	use the PLC-5 Typed Write commands for this example. CIP
	commands are not supported by the ENI.
Nodes 45 to 49	When sending messages to a 1756-ENET/ControlLogix Controller,
	the controller MUST be in slot 0 of the ControlLogix chassis for the
	message to be delivered to it.

At this point we could merely configure ENI #2 as we did ENI #1. Or, we could use the method outlined in Chapter 5 to configure ENI #2. This method sends configuration Messages from the L20 controller via the DF1 link. If for any reason this ENI would need to be replaced, it could then be easily and quickly configured via messages from the

L20 controller. A ladder program to accomplish this is as follows:

Publication 1761-UM006A-EN-P - February 2001