12/27/2017 10:25 AM | |
Posts: 1 Rating: (0) |
Hi, We have faced a problem twice in two Siemens S7 PLC S7400. (6E S7 414 5H) Its slave CPU started all LED blinking (master CPU running normal except redundancy error). Memory reset could not solve the problem.Finally we recycled the power, i.e switched off power supply and removed battery from CPU and also detached CPU from back plane once and reinserted it. After this we pressed memory reset and all the errors were finally reset. This happened twice in two different PLCs, with a slight difference in two cases. 1) In first case, CPU started blinking but process was without any problem and we did all our troubleshooting after the casting is finished. 2) In second case, although the master CPU was working fine (except redundancy error), but communication with HMI was also lost which we could not restore with master CPU only. HMI communication got restored only after both the CPUs became okay What is the reason behind this issue? What should we do? ------------------------------------------------------------------------------------------ |
Last edited by: CS Moderator at: 12/29/2017 11:56:57 AMNew subject after splitting |
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12/29/2017 12:11 PM | |
Joined: 8/25/2005 Last visit: 7/5/2024 Posts: 1161 Rating: (110) |
Hello saheb_et@rediffmail.com, when all LED's are blinking an internal error was detected. If the issue still exist my suggestion is to create a Support Request to get in contact with Siemens. You should share the dignostic information of the CPU with the Support Team. Good luck |
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