CC-Link IE Field basic Problem

[Nightfly 12]

We have two identical machines consisting of a Fx5uc PLC connected to a FR-F840 VFD using CC-Link IE Field basic. All the devices have different IP addresses (on the same subnet).  Both machines work perfectly fine on their own (so not connected together by an unmanaged switch). However, as soon as you do connect them together the CC link on one of them stops. The diagnostics says everything is fine and no error bits are activated in the PLC.

Can you have two PLC's controlling two VFD's (one each) on the same subnet?

We have Mitsubish UK on the problem but they have not come back with anything yet.

Any ideas  

 

Thanks

[GreenMan 18]

Hi

It is not possble to have two masters on the same subnet because og the sync flag every master sends. Two masters on the same unmanaged switch is ok as long as they are on two different subnets. For example: System 1: 192.168.3.xxx and system 2: 192.168.4.xxx. 

If you are using one GOT (or other HMI) to both systems you need to open for a larger network in the ethernet settings.

Good luck :)

[Nightfly 12]

Many thanks for the advice GreenMan.

Cheers