Replacing relays on S7 200

[ecca 0]

Hi there, I have a Siemens S7200 , circa 1997 that has one or more duff relays. How practical is it to replace them ? ( I'm a Mitsi man really ) Cheers Eric Thacker

[Joe E. 259]

I've never done it on that particular model, but have with some old AB units. I think the hard part would be locating replacement relays. If you open up the controller you should be able to get numbers off of the existing relays and then practice your Google-fu to find their specs and then find a replacement. I would expect the relays to be thru-hole components, which makes them a little more straightforward to replace. As for whether it's practical or not, what's your time worth? What does it cost to send it out for repair?

[JRoss 84]

For your time, you're probably better off replacing the whole PLC. If the relays are starting to go, it's only a matter of time. Short-term, can you just relocate the outputs?