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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tigrot

Well-Known Member
Licensed User
it looks like tou created a resistor divider. I don't have internal schematic, so I can only guess... I think the input inpedence of plc is quite low.
 

Tayfur

Well-Known Member
Licensed User
One more question: type of pnp sensor?
a friend told me, PLC electrical power may not be enough.
all 24v Sensors (for all input divice source is PLC output for 24V. (like Red wire)

is it possible???
 

tigrot

Well-Known Member
Licensed User
Use an external source. The device should not sink more than 3mA at 24 V. Is sensor able to work at 24 V? I don't have any info
 
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tigrot

Well-Known Member
Licensed User
Did you connect S/S pin according use? Seems quite important for input handling, according user's manual of plc.
 

Tayfur

Well-Known Member
Licensed User
Use an external source. The device should not sink more than 3mA at 24 V. Is sensor able to work at 24 V? I don't have any info
sorry my late anser. (national holiday)

I tried External power source. its not changed.

Sensors : DC10...30V
Ia:200mA
 
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