Modbus Plus to Ethernet Bridge

1.2Bridge Message Transactions and Paths

Two types of messages can be initiated to Modbus Plus nodes using Modbus commands. Programming messages are used for logging into a node and controlling it, as in load/record/verify operations. Data access messages are used to read or write data at the node, or to get statistics from the node.

When a message transaction is initiated, a logical path is established between the originating node and destination node. The path is maintained until the transaction is completed. The type of path that is set in each device is determined by the Modbus command embedded in the message.

Table 1 summarizes the four possible types of Modbus Plus paths. The bridge supports up to eight paths of each type.

Table 1 Modbus Plus Path Types

Path Type

Opened in Node

Opened for Modbus Command

Data Master (DM)

Originator

Data access

Data Slave (DS)

Destination

Data access

Program Master (PM)

Originator

Programming

Program Slave (PS)

Destination

Programming

The maximum amount of concurrent TCP/IP connections available in the bridge is between 8 and 16, depending on the usage of paths in host applications.

For example, up to 16 data connections can be active between TCP/IP hosts and Modbus Plus nodes (a maximum of 8 active DM paths and 8 active DS paths). Up to 16 programming paths can be active (8 PM and 8 PS).

If Modsoft software is being used, it sets both a PM and a DM path in the bridge for each active connection it maintains to a Modbus Plus destination node. Modsoft could be running on a single host, or simultaneously on multiple hosts. Thus up to eight TCP/IP connections can be maintained with Modsoft running on one to eight hosts.

Table 2 summarizes the Modbus function codes which open DM and DS paths in the respective nodes. For complete information about Modbus commands, see the Modbus Protocol Reference Guide, publication PI--MBUS--300.

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Schneider Electric 174 CEV manual Bridge Message Transactions and Paths
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174 CEV specifications

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