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Publication 1761-UM006A-EN-P - February 2001
Connecting 1769-L20 CompactLogix Controllers on Ethernet 7-11
the L20 controller’s tag database shown below. On the MSG
Instruction’s Communication tab above, the path is “2,250”, where the
2 represents the L20 controllers serial port and the 250 tells the ENI
module that the 4 words of data contain its IP address.
Figure 7.10 L20 Controller’s Tags
Per Table 7.4, The MSGs in Rungs 2, 3 and 7 are 2 bytes or 1 integer
word in length. Their Paths are “2,253”, “2,252” and “2,248”
respectively; where 253 represents Baud Rate, 252 represents BOOTP
Enable/Disable, and 248 represents the Save function.
The single integer data value for these messages is shown in Table
7.4. “0” is the value for the Save MSG data tag
(ENI_SAVE_TO_FLASH_VALUE), which instructs the ENI to save its
configuration to non-volatile memory. “6” is the value for the Baud
Rate MSG data tag (ENI_BAUD_VALUE) which instructs the ENI to
begin communicating on its RS-232 port at 38400 Baud. “1” is the
value to disable BOOTP (BootP_disable_value).
Per Table 7.4, The MSGs in Rungs 5 and 6 assign IP addresses to node
numbers in the ENI module’s Message Routing Table. These two MSG
Instructions are the same as the MSG Instruction in Rung 3, except the
paths are 2,101 and 2,145 and the data tags have different names; this
time containing the IP addresses of the SLC 5/05 and 1756-ENET
module.