Other PLC-optocoupler-3wire_sensor

Tayfur

Well-Known Member
Licensed User
Normaamly cınnecftion reading 24Volt(Right side) .its normal.

But .I connected Optocubler board like under below. Iam reaading A-B points 12Volt.
Why reduce voltage. This is problem for PLC.

How can i fix? What/where is problem.

I am not Elektroinc tech. Please explane simple. Thanks.
upload_2019-8-6_15-49-17.png upload_2019-8-6_15-57-50.png

upload_2019-8-6_15-49-17.png
 
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Tayfur

Well-Known Member
Licensed User
Hi. What happens if you disconnect 1? And 5?
disconnect for 1. Result is like first article picure(Right side). But; my borad is not works.

cable 5 is sensor cable. All system dot work if I discoonect cable 5 .

PLC dont work when I disconnect Apoint(PLC x4). So My boıard works.
 
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tigrot

Well-Known Member
Licensed User
Look at page 68 of https://www.oaaust.com/FX2N Hardware Manual-2.pdf
They show connection of an external transistor. Your case is the second(figure 5.2), but you use a PNP sensor, while with this cabling you must have a NPN. And this is why you get a half 24V (12V).
You can adapt the circuit to use a PNP, but you must use additional components, or put S/S to 0V, in this case the functions of the PLC would be upside down and other functions if presents may not work.
 
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Tayfur

Well-Known Member
Licensed User
Look at page 68 of https://www.oaaust.com/FX2N Hardware Manual-2.pdf
They show connection of an external transistor. Your case is the second(figure 5.2), but you use a PNP sensor, while with this cabling you must have a NPN. And this is why you get a half 24V (12V).
You can adapt the circuit to use a PNP, but you must use additional components, or put S/S to 0V, in this case the functions of the PLC would be upside down and other functions if presents may not work.

I will check again tomorrow.

like under below
https://dl.mitsubishielectric.com/dl/fa/document/manual/plc_fx/jy997d31301/jy997d31301m.pdf

I looked page 140-160 (section 10.1 and 10.2 shamatic)

I will share results.
Thank you support @tigrot
 
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