Hello Control community,
Please I need your help.
I had a problem with our 2 PLC's, siemens s5 cpu 135U with an eprom extension module 184U, powered with 24Vcc from 2 batteries 12V and a charger.
We got a high voltage from the charger, that caused a burned 1 PLC power supply.
We changed the 2 batteries with new ones and we start our PLC's CPU at run mode, but the problem we got is that all the output are at "0" state even if i see at the program in the PC and seems that the Outputs are changing the state.
I change the CPU with a new one and also the interface module.
Thanks

 

Even if the CPU is running and logic is correct, output modules (especially digital outputs) often require their own external 24VDC power.
Check the power supply to the output modules. Use a multimeter to ensure 24V is present at the module's power input terminals.

The surge that damaged the power supply could have also affected the output modules.
Test outputs manually (if safe) using a known-good signal to confirm they respond.
If possible, swap with a known-working output module to isolate the fault.

Since the issue started with overvoltage from a charger, double-check:
The charger's output voltage under load.
That both the battery and charger are properly filtered (e.g., add TVS diodes, fuses, or varistors for protection).
Consider installing a 24VDC regulated power supply with surge protection for future safety.

If you're thinking about creating a remote I/O system that communicates with newer PLCs or a SCADA system,you can take a look at this setup: https://www.pcbway.com/project/shareproject/Shild_EBYTE_LORA_IOT2050_SIEMENS_e074f4eb.html

 

Even if the CPU is running and logic is correct, output modules (especially digital outputs) often require their own external 24VDC power.
Check the power supply to the output modules. Use a multimeter to ensure 24V is present at the module's power input terminals.

The surge that damaged the power supply could have also affected the output modules.
Test outputs manually (if safe) using a known-good signal to confirm they respond.
If possible, swap with a known-working output module to isolate the fault.

Since the issue started with overvoltage from a charger, double-check:
The charger's output voltage under load.
That both the battery and charger are properly filtered (e.g., add TVS diodes, fuses, or varistors for protection).
Consider installing a 24VDC regulated power supply with surge protection for future safety.

If you're thinking about creating a remote I/O system that communicates with newer PLCs or a SCADA system,you can take a look at this setup: https://www.pcbway.com/project/shareproject/Shild_EBYTE_LORA_IOT2050_SIEMENS_e074f4eb.html

Thanks Mr Bidrohini for your replay
For the outputs supply i allready test it and it's ok.
For the output testing i will do this check.
Else i can't suspect the program ?