How can I read the Modbus Diagnostic of the x80 Ethernet modules by Explicit Message?

Issue
Customers want to read the modbus daignostic of the BMENOC modules to publish this data in their SCADA and this resolution identifies the right configuration of the DATA_EXCH to read this info by Modbus TCP using a Function Code 0x03.

Product Line
Ecostruxure Control Expert, M580, BMENOC0301, BMENOC0311, BMENOC0321

Environment
Control Expert v14.1, Windows 10 version 1902 (OS Build 18362.30), BMEH586040 v2.90, BMENOC0301 v2.17

Resolution
A Modbus request associated with function code 3 with the Unit ID 100 asks the Modbus server BMENOC modules to return I/O connection, extended health, redundancy status, FDR server, etc.:

Using the table above, you can create a Modbus Explicit message using DATA_EXCH to read this information. The example below is to read the modbus diagnostic of a BMENOC0301 (IP address 192.168.10.10) located on slot 2 of the backplane, using ST language and you can use it as a guide for your own logic.

P.S.: Additional information can be found on pages 142/372of the Ethernet Communications Module Installation Guide and on page 12 of the Modbus Application Protocol Specification.

Udgivet til: Schneider Electric Danmark