Siemens S7 400 PLC Troubleshooting || PLC in STOP mode || How to restore PLC to RUN mode

At times Siemens S7-400 PLC switch to stop mode and despite several attempts such as switching the position of RUN/STOP or Cold/warm restart or reboot, the PLC still remains stuck in STOP mode. During STOP mode, your plant cannot operate thus resulting in production losses.
As a DCS/PLC engineer/technician, you must restore the PLC processing, i.e to get back to RUN mode.
As a SOP, You first need to download HW configuration, then the Logic and finally the network configuration.
In the video tutorial, these steps have been performed.

[@ammadussiraj5617]

Well explained. Thankx team

[@Sidico7]

Thank you for this video, you've cleared so much more than many books and internet pages on how to download hardware, logic and network (critical!).

[@PLCNerd]

Thanks for your feedback

[@abugaus9846]

Valuable information and clear explained thank you sir

[@opinisiddik5691]

Thank you for you're video, actually i facing same problem and now it was fixed by download backup

[@PLCNerd]

Welcome

[@moniruzzamanshohag]

Hello Sir, Is it possible? Auto stop the SIEMENS PLC CPU, when happen any critical alarming situation. S7-300 PLC CPU physical Switch position can be move automatically from RUN position to STOP position?

[@lakhindarrajak8105]

Very good video sir.

[@khalilkhalil6852]

following power outage I have a s-400eb automaton fault in stop mode we checked the batteries, no anomalies What do you think is the cause of the defect? Sincerely

[@myspace20]

My PLC also in same position. But my PLC has redundant module also and both are in stop mode. What is the procedure for downloadin

[@veereshh1824]

Dear sir Please let me know Once came PLC solo Mode it can come automatically run mode ? or we need to switch from stop to run mode? (PLC CPU 417)

[@wonderfulworld5134]

Did you disconnect the power to the PLC? Reconnect and it may clear the error that causes STOP? To be able to re download the PLC ladder program again takes the expert with the programming computer and the same program. Maybe they changed something that caused this and the original program had to be re installed.

[@PLCNerd]

Yes. Disconnected but this issue get resolved only with complete configuration download.

[@binyassina1525]

I have problem : hardware configuration error for plc s 400 V4.10

[@suduik]

Hello there, I think I have same issue but with different setup. One of our redundancy 414 -H CPU has been replaced due to unable to run. We did memory reset after installing new CPU, and found the CP443 and new 414 CPU were stuck in STOP mode. I was checking the diagnostic buffer, and found CPU link up/ update by master aborted. Cause: Synchronization error in operating due to incorrect data. My question is: If I download the entire back up program and netpro config for this particular PLC, will it affect the master PLC that running properly? Will it change the netpro for other connection partner for master CPU? Thanks

[@mohamedslimani4432]

How to fix the REDF error led status.?

[@katthine5339]

Thank you

[@hosseinbarati320]

❤❤excellent

[@PLCNerd]

Thanks!

[@manishshinde6197]

In my case s7-400H plc not allowing to upload & download. Also try with mres switch but plc not reset what will i do ?

[@PLCNerd]

Turn the power supplies off. Remove the PLC CPU and then plug again. Turn the power supplies again. Now (if the communication media is ok) it will be able to download configurations from Engineering station/PG.

[@iqbalmehedi3423]

Excellent video captured. Thank you Sir. I am facing some problem with my S-7 400 CPU, Sir can you help me please

[@PLCNerd]

The solution has been explained in the video. Didnt it solve the problem?

[@iqbalmehedi3423]

@@PLCNerd Sir problem solved by an Engr but procedure was different. I want to discuss with you personally. Sir please give me a chance.

[@iqbalmehedi3423]

@@PLCNerd Sir please give your email address

[@iqbalmehedi3423]

@@PLCNerd Sir please give your email address

[@daviderhahon]

@@iqbalmehedi3423 Give your own email address so UTAcademic will contact you.

[@industrialelectricalsekho8883]

My siemens plc ET 200S PROBLEM, SUDDENLY POWER OFF THEN NO DATA SHOW IN HMI DISPLAY ONLY ****** SHOW, PLEASE GUIDE HOW RESTART PLC

[@PLCNerd]

Re download program to PLC CPU. Program may have been washed. Check HMI to PLC comm cable as well.

[@erbalumkan369]

is the configuration not stored on the memory card of the plc? Could it not be restored by switching the MRES switch?

[@PLCNerd]

No. Not in the case of S7-400 PLC. In this S7-400 PLC, the program is stored in the RAM i.e requires continuous power supply. BTW MRES erase the program stored in memory.

[@dharmendraverma5267]

Good👍

[@angbuhayngofw3895]

Hi Teacher i have also problem with the PLC S7-1200 the plc status is stop mode. How to resolve this problem teacher?

[@PLCNerd]

In TIA portal, go online and try to change the status of PLC from stop to run mode. Also try to redownload the project into the PLC. PLC in stop mode means either it has no program in it Or due to some error it has been switched to stop mode.

[@ajeetpal8985]

Hi good video. My siemens cpu s7400 show battery2 indication. Whats is means plz tell me.

[@PLCNerd]

It means that Battery 2 needs to replaced. It has been discharged.

[@zizikundimalucas7712]

Change the battery at position 2

[@sidikging2988]

is there any Siemens plc that still oke if got power cut? i mean the program not lost and no need to redownload. i found omron plc is good, no need to redownload after start up / or power cut

[@PLCNerd]

S7 - 300 and S7 1200 Program doesnt get washed even if power is cut off. In S7-400 PLC in this video, must have internal batteries working, to save program from erasing.

[@sidikging2988]

@@PLCNerd oh thank you, is s7-300 and s7-1200 have internal battery too?

[@ZahidkhanJummal]

​@@sidikging2988s7400 it has, 300 i think so no

[@askilash7855]

Sir I want learn siemens PCS 7 software and hardware how to work and check and use it software

[@PLCNerd]

Dear You can learn PCS7 from youtube videos and manuals on google. Paid courses are available as well such as on Udemy.

[@askilash7855]

Pls help me sir my company same use this software of siemens PCS 7

[@cameronsheridan5997]

Will this work in redundant CPUs?

[@PLCNerd]

Yes.

[@ZahidkhanJummal]

Download and warm start is also solution right

[@PLCNerd]

Possibly. Depends on the scenario.

[@ZahidkhanJummal]

@@PLCNerd like what SCENARIO

[@sidikging2988]

Thats mean we must have the back up programs

[@PLCNerd]

Exactly. And u must make sure Backup UPS and PLC internal batteries be okay.