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S7-200 PLC external module damange

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nuwands

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Hi! I did something wrong. I connected an external power supply of 12v in parallel with the PLC power supply by accident. The picture shows how it was wired. The external power supply was blown off. The problem is, now the modules connected to the PLC are not working at all. Could someone please help me to understand what happened and what type of possible repair I should perform? Thank you.
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d123

d123

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Hi,

I suspect the first step is to purchase a (cheap) DMM. Checking for any possible blown fuses is another starting point, and prior to getting a multimeter and reading the device manuals in case there is a generalised picture of what they look like inside or better yet a proper schematic.
 

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