Configuring the Bridge

3.7How Mapping Works: Modbus Plus to TCP/IP

The bridge contains an internal Modbus Plus to TCP mapping table with 255 entry fields, each containing an IP address. Each message received by the bridge from a Modbus Plus node contains a five--byte routing path field as shown in Figure 16.

Figure 16 Format of the Modbus Plus Routing Path Field

Byte:

1

2

3

4

5

 

 

 

 

 

 

 

Bridge

Bridge

First IP

MB+ Table

Last

 

 

Node

Path

Routing

Routing

Routing

 

Address

 

Byte

Byte

Byte

 

 

1 ... 64

1 ... 8

1 ... 255

1 ... 249

(Not Used)

 

 

 

 

 

 

 

REQUIRED

OPTIONAL

Defines index into this bridge’s TCP Mapping table, and routes message to the IP destination stored in that table location.

If IP destination is another TCP/IP-MB+ bridge, this byte routes message to the MB+ node address in that bridge’s MB+ Mapping table.

Bytes 1 and 2. Bridge Node Address and Path

The first byte in a message initiated from a Modbus Plus node to the bridge addresses the bridge. The second byte opens a path within the bridge.

Byte 3. First Bridge’s IP Routing

The third byte corresponds to the dest_idx field in Modbus commands. This byte indexes the bridge’s TCP Mapping table. The bridge extracts the IP address at that table location and forwards the message to the IP destination.

Byte 4. Second Bridge’s Modbus Plus Routing

Byte 4 allows the Ethernet network to operate as a link between two or more bridges and their respective Modbus Plus networks. If the IP destination (from the byte 3 table index) is not another bridge, the fourth byte is not used.

If the IP destination is another bridge, that bridge uses the fourth byte to index into its MB+ Mapping table. It will extract a Modbus Plus routing path from the table and forward the message to a destination node on its own Modbus Plus network.

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Schneider Electric 174 CEV manual How Mapping Works Modbus Plus to TCP/IP, Bytes 1 and 2. Bridge Node Address and Path
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174 CEV specifications

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