Modicon M340 Modbus TCP and Modbus Serial?

Join Date
Feb 2008
Location
Walnuc Creek, CA
Posts
31
I'm looking to purchase an M340, and need it to communicate over Modbus TCP to several devices and Modbus serial to a few others.

First off, this seems like standard operating procedure, but I wanted to verify that this is in fact possible before making the time/money investment.

Secondly, when doing this, from a programming standpoint does it look as if it's all one Modbus network? For instance, would I use the DATA_EXCHG function block to issue commands over both, the only difference being that I reference the devices independently by their Modbus ID?

Thanks in advance for your help.
 
First off, this seems like standard operating procedure, but I wanted to verify that this is in fact possible before making the time/money investment
Yes it is possible

Secondly, when doing this, from a programming standpoint does it look as if it's all one Modbus network? For instance, would I use the DATA_EXCHG function block to issue commands over both, the only difference being that I reference the devices independently by their Modbus ID?
For both ModbusTCP and Modbus serial (assuming the M340 is to be the master) you would use the Read_Var and Write_Var functions. The Addm function is used to generate the address.
This is all available on the built in ports on the higher level M340, however I would look at using a NOE module for the ModbusTCP. The NOE module will give you access to a lot more functionality (DHCP server, IO scanner - just fill out a table to setup all your comms, Global data, Messaging, Email notification, FDR - faulty device replacement)

hope this helps
Geoff
 

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