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[KB651]How to use priority in the PcVue Modbus redundancy

Tags: Modbus TCP/IP

Data acquisition
11 years ago
By RM
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Applies to:

PcVue version 10.0 SP1 onwards.
Summary:

This article describes how to use priority in PcVue Modbus redundancy.

PcVue Modbus TCP is able to manage redundancy of up to 6 IP addresses. In case of failure the connection will switch from one Slave IP to the next but, by default, the driver stays on the last valid connection. The piority management allows you to automaticaly switch back to the highest priority connection available. The connection order gives the priority order, connection 0 being the highest and connection 5 the lowest.
Details:

The following configuration example illustrates priority management between the following slaves, Eqt1 and Eqt2.

  • Eqt1: 10.86.13.220
  • Eqt2: 10.86.14.220

PLC1 will switch automatically between Eqt1 and Eqt2 address according to the connection status of Eqt1 and Eqt2.

  1. Configure 2 nodes as in the following screen shots.
    The nodes are required to check the connection availability for the 2 IP addresses:
    Eqt1 will check the availability of IP 10.86.13.220.

    Eqt2 will check the availability of IP 10.86.14.220

    In order to check the availability of the connection you must configure a frame, linked to at least 1 PcVue variable, for each node.
  2. For each node configure the same Sharing Group.
    For each node, in advanced options, tick Enable the sharing connection and use the same sharing group number.
    Advanced options
  3. Create the main node that manages the automatic switch. All the process variables will be linked to this equipment.

    Click on Advanced options and tick Enable the sharing connection and define the same group number as for Eqt1 and Eqt2.

    The network address of the PLC must be the same as one of the previously configured “availability” nodes (Eqt1 or Eqt2). The order in which you declare them defines their priority order.
    In the example:
        10.86.13.220 is connection[0] and has the higest priority
        10.86.14.220 is connection[1] and has the lower priority
    Click on Redundancy and do not forget to tick Enable priority management.

 
 


 

 

Created on: 20 Jun 2013 Last update: 13 May 2024