ModBus TCP Client Node open many connections!

#1

Hi all,

I have a PLC that acts as ModBus TCP Server and can manage only 1 ModBus TCP Client.

In Node Red I use the "node-red-contrib-modbustcp" library to read and write some tags (Holding register, Coil, etc) and so I use many different modbustcp-read nodes that use the same Server.

It seems that, for every modbustcp-read node, Node Red open a different connection with the Server.

In effect, PLC side, I see that first connection from Node Red is accepted and the others are refused (Node Red side only 1 modbustcp-read node is "Connected").

In Node Red I have defined only one Server.

Is it possible to force system in using only one connection?

Thanks

#2

Not sure if the author of the node hangs out here. Maybe best to raise an issue direct on that nodes repository on github.