Configuring the Bridge

3.6Setting 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.

3.6.1MB+ 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.

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Schneider Electric 174 CEV manual Setting the Mapping TCP/IP to Modbus Plus, 1 MB+ Mapping Table Layout and Default Entries

174 CEV specifications

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