2 Modbus RTU Networks

[DonM]

Hello,

I would just like to check if there are any problems configuring a V570 to communicate on 2 separate Modbus RTU networks using PLC com ports 1 & 2 both using RS485? On one network the PLC would be a master and on the other a slave.

Thanks.

Best regards,

Don.

[Emil]

No any problem! Standard situation.

[Simon]

Hi Don,

See the examples:

C:\Program Files\Unitronics\Unitronics VisiLogic_C\Examples\Version 900\Project examples\Communications\MODBUS

then look for V280_Modbus_port_to_port_test.vlp

change the hwardware properties to V570 and download it. It sets one port as master and one also slave so you can do a loopback. Very handy when testing Modbus comms, so you can at least confirm if the PLC Modbus is working. Then you can plus in external masters/slaves.