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Publication 1761-UM006A-EN-P - February 2001
ENI Configuration (Node 248 to 254) 4-9
2. Create your message logic using whatever conditional
instructions you may need. This example uses bit B3:0/7 to
condition the MSG instruction and message file 10, element 16
to manage the message session.
3. Open the message instruction and enter the appropriate
variables. The variables are described in Table 4.2.
Table 4.2 Message Instruction Variables for Configuring ENI String Parameters
Variable Setting
This Controller Parameters:
Communication Command For the ENI configuration, this must be set to:
• 485CIF for MicroLogix and SLC
• an unprotected write command for CompactLogix and
PLC-5
Data Table Address In this example we are using string file 25, element 0 (ST25:0)
Size in Elements For all ENI parameters that require a string configuration,
always set this to 1.
Channel The RS-232 communication channel that is connected to the
ENI, typically 0 or 1.
Target Device Parameters:
Message Timeout Leave this value at the default.
Data Table Offset Always 0.
Local Node Addr (dec). This is the destination node address, in this example it is 249.
Local/Remote Always Local.