Canopen and fx3u

[Carples111 0]

Hello

I have a machine using Canopen to control 6 sanyo denki Rs1 servo amps via a fx2n 32 can module

Recently machine stopped and only fault we could find is

1. error light flashing on one of the amps canopen plugs

2. all run lights also flashing

3. no Tx/Rx light on can module

Replaced amp, module and motor no go but now encoder battery fault because it was disconnected

Tried all parts in local distributors machine as a test and worked ok

Can download parameters from PLC cant clear encoder fault

no faults in BFM 29

BFM25 indicates pre operational mode

All drive indication no fault only Can Open not active

manufacturer insists i need to clear encoder fault before Can open will function correctly

Question 1 - Would the A2(battery fault) prevent the communications layer from going operational 

Question 2 - is there anything that would physically cause the bus to fail to go operational i.e. if I skipped a drive on distributors machine I would get a similar fault but with extra error light on skipped drive.

Question 3 - what is best place or way to lookup faults in system 

[Carples111 0]

So I found an answer

No there is no fault on the amp that will prevent the Can open from going operational

Turns out the PLC was faulty replaced it and system fired up.

Old PLC would not take a program reload correctly as verify is always wrong