Other PLC-optocoupler-3wire_sensor

[Tayfur]

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.

 

[tigrot]

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]

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.

This schematic is OPTOCUPLER Board
View attachment 82904

 

[tigrot]

Any info about plc input impedence?

 

[f0raster0]

maybe this link can help:
https://www.proface.com/support/index?page=content&country=ES&lang=es&locale=en_US&id=FA142566&prd=

 

[Tayfur]

Any info about plc input impedence?

Sorry;I think optocoubler borad.

I found now PLC

 

[tigrot]

Short 3k resistor on output. The input impedance is high enough.

 

[Tayfur]

Short 3k resistor on output. The input impedance is high enough.

Thak you for support @tigrot
What could be the solution to the problem?
Where do I place resistance/diod.. etc? Can you show me the diagram above?

 

[tigrot]

Short resistor 3K at left of diagram .

 

[Tayfur]

Short resistor 3K at left of diagram .

Which locaiton 1-2-3-4-5 for 3Kohm?

Can I use 4,7Kohm resistor for alternaitve? its now ready.

 

[tigrot]

One more question: type of pnp sensor?

 

[Tayfur]

PNP
DC 10-30V
Sn:8mm
Ia:200ma

 

[Tayfur]

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]

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

 

[tigrot]

Connection 5 is X4 input of PLC?

 

[tigrot]

Did you connect S/S pin according use? Seems quite important for input handling, according user's manual of plc.

 

[Tayfur]

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

 

[Tayfur]

Connection 5 is X4 input of PLC?

Yes. PLC connected with X4

 

[Tayfur]

Yes. We cheked.
İts (S/S) connectted directly 24V on PLC

Thank you for Helps @tigrot

 

[tigrot]

Hi. What happens if you disconnect 1? And 5?