Schneider Electric 174 CEV - Manual (Page 38)

Configuring the Bridge
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3.6
Setting the Mapping: TCP/IP to Modbus Plus
As you design your application you should define a Destination Index value
(1 ... 249) for each Modbus Plus node to which your Ethernet host will originate
messages. Edit the bridge’s mapping table to correlate each Destination Index
value to the five--byte routing path for the intended Modbus Plus node.
3.6.1
MB+ Mapping Table Layout and Default Entries
The MB+ Mapping table contains 249 fields, labeled MBP_1 through MBP_249.
These fields define Modbus Plus routing paths for messages from TCP/IP hosts
which contain Destination Indexes 1 through 249 decimal.
The bridge is shipped with default Modbus Plus routing paths for Destination
Indexes as shown in Table 17.
Table 17 TCP/IP to Modbus Plus Default Mapping
Destination Index (dest_idx) Modbus Plus Routing Path
1 ... 64 1.0.0.0.0 ... 64.0.0.0.0
65 ... 128 2.1.0.0.0 ... 2.64.0.0.0
129 ... 192 3.1.0.0.0 ... 3.64.0.0.0
193 ... 249 3.2.1.0.0 ... 3.2.57.0.0
For example, the default entry in field MBP_1 specifies that TCP/IP messages
intended for dest_idx value 1 will be routed to Modbus Plus node 1 on the local
Modbus Plus network (the same network that contains the bridge).
Figure 15 shows an example of the bridge’s default mapping, with one custom
entry made by the user.