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[KB292]Modbus IP and Network Behaviour

Tags: Cimway, Modbus TCP/IP, Multistation

Data acquisition
14 years ago
By RM
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Applies to:

PcVue all versions.
Summary:

Using Modbus IP, in network architecture, its possible for the client station to unexpectedly communicate directly with equipment. How?

  • A variable is incorrectly configured with the client station as the server for the variable.
  • Incorrect network configuration.
Details:

To prevent stations other than servers are able to communicate with equipment, you should add to all lines beginning with NETWORK in the file COMM.DAT, the name of a server list as shown below:

BOARD,0,1,1,0,0,0,0,,,0,0,””

NETWORK,0,0,A14,211,,0,0,NO,0,0,0,25,0,1,0,0,,,0#0#0#0#0,LSREDONDANCE,,0,0,””,0,0,0,,,1

EQT,0,0,0,API_Y,3,SINEC-H1,1,0,0,0,0,20,0,1,0,,0,,1#0,0,,,0,0,””

FRAME,0,0,0,0,TC_Y,0,64,512,RW,1,DB ,1,0,0,1,0,11,1024#0,11,1,1,,,0,0,””

Created on: 17 Dec 2010 Last update: 13 May 2024