FX1N-14MR Working problem

[Zubair Malik 0]

Hi,

I am using the MITSUBISHI FX1N-14R with the following wiring(Please see the attached image). I programmed it as when X1 gets 24VDC it turns on the a Bulb on Y1. When I executed it on my PLC, it worked OK for 3 or 4 time, after that the bulb is always on, its not turning off even I Reset the powers of PLC and the Bulb. Whenever I just turn on the power the Bulb gets turn on and not getting off even if there is no 12VDC in X1

I think I have lost Y1(I mean the Y1 is short circuit). Can you please tell me that whats wrong with my wiring and why I lost the Y1 and can I recover Y1?

 

Thanks

[Ron_S 61]

It is usual to put the live side of 240v through the output but in this case it doesn't matter.

The COM terminal on the input side is concerning me

There isn't one there. It's an SS terminal

Where are you getting your 24vdc from?

[Zubair Malik 0]

Thanks for ur response.

I m getting 24vdc from a power supply which gets the 220VAC and convert it to 24VDC.

 

[Ron_S 61]

What about the ss terminal? What is that connected to?

[Zubair Malik 0]

S/S is connected to 24VDC(N).

[Ron_S 61]

Put a test meter across com1 and y1 (with all power off)

If there is a connection, the internal relay has welded on

[Zubair Malik 0]

I checked..

Its welded on..

Can anyone plz tell that why it happened?

[Ron_S 61]

Too much current, short circuit, 2nd hand plc where that output was already faulty

[Zubair Malik 0]

I used relay and its working great...

Your suggestion worked very well.

Thanks for all people being so kind.