2/26/2021 6:14 AM | |
Posts: 1 Rating:
|
Hi, I have S7 - 400 PLC on one of our asset for drilling system. 2 Months before, there was a intermittent malfunctioning in our system functionality, so we were troubleshooting on that & found that 2-3 PLC 24 V DC Digital inputs are getting 60-70 V AC mixing signal (interference) at the DI module terminals. Then we troubleshooted that issue & system was back to normal. But, I have one doubt. If DI module is getting 60-70 V AC signal, but still it is partially working & no damaged to the DI module. Is there any isolation protection circuit in modules for preventing damage from unwanted AC supply? ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 02/26/2021 08:13:55New subject after splitting |
|
Follow us on