ProSoft Technology 5301-MBP-ASCII - Manual (Page 14)

Functional Overview MBP ♦ ProLinx Gateway
Protocol Manual Modbus Plus
Page 14 of 52 ProSoft Technology, Inc.
May 12, 2011
1.3 Single Port With Dual Media-Redundant Connector Operation
Some Modbus Plus modules are equipped with a second, redundant Modbus
Plus Connector. A Dual Connector Modbus Plus network is implemented in the
following way:

The primary network connects to Connector 1 on all modules.

The secondary (backup) network connects to Connector 2 on all modules.
If the primary network connected through Connector 1 fails (for example, if a
cable is cut or disconnected), the network connected through Connector 2 will
become active, maintaining the connection between devices.
Important: All Modbus Plus nodes on a network must be equipped with dual connectors in order to
implement redundant connector operation.
Refer to the following illustration for an example of redundant connector
operation on a Modbus Plus network.