Multiple Master at one network

  • Thread starter Ståle Hope, Servo Electronics
  • Start date
S

Thread Starter

Ståle Hope, Servo Electronics

I have a network where the master communicate with different slaves. I want to add a second master to the network to communicate with an exisiting slave that already communicates with the original master. This system using Modbus RTU at 2-wire RS485.
 
Modbus RTU is designed to support only a single master. A thread on this forum addressed the feasibility of multiple masters using either a 3rd party bus moderator (Anybus) or Modbus TCP.

http://www.control.com/1026209439/index_html#1026209533

An alternative is to have the current #1 master read from the slave and then write that data to the 2nd master, which you configure not as a master, but as a slave.

Dave
 
I don't know which plc or dcs system are you using, but remember that exists MODBUS PLUS designed at this time to have PEER TO PEER communications, that means you can configure multiple master in your net.
 
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