Need Help Connecting Pressure Sensor to analog input of a PLC

[Joe Walsch]

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Hi everyone,

I recently acquired a Revolution Pi Connect 4 along with the MIO module, and I'm aiming to collect process data from a WIKA A-10 pressure sensor. This sensor is a 2-wire, 4-20 mA type.

I'm looking for a detailed explanation on how to connect this sensor to the PLC and read the data. I initially connected the U+ from the sensor to IN1 of the PLC and U- from the sensor to ground, but it didn't work. Do I need additional signal conditioning, such as the Phoenix Contact MCR-SL-U-I-UI-SL, to convert the 4-20 mA signal from the sensor to a 0-10V signal?

I understand that the analog input of the MIO module measures voltage (0-10V) and does not directly handle current.

Any detailed guidance on the precise wiring and configuration steps would be greatly appreciated!

Here is the data sheet for the Digital & Analog Input module I use: https://revolutionpi.com/wp-content/uploads/manuell/datenblatt/Datasheet_RevPi_MIO.pdf

Here is the data sheet for the WIKA A-10: https://www.wika.com/media/Data-sheets/Pressure/Pressure-sensors/ds_pe8160_en_co.pdf

Thanks in advance for any assistance!

 

[Joe Walsch]

Here are the working links:
RevPi MIO module: https://revolutionpi.com/wp-content/uploads/manuell/datenblatt/Datasheet_RevPi_MIO.pdf
WIKA A-10: https://www.wika.com/media/Data-sheets/Pressure/Pressure-sensors/ds_pe8160_en_co.pdf

 

[oliver.tonn]

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Did you realize, that you already have given yourself the answer to your question?
The MIO input can handle 0-10V, your sensor delivers 4-20mA, that doesn't go together, only with some trick by connecting a resistor (500Ohm) from your MIO input to ground so the current of the Sensor will "create" a voltage over the resistor.
What you are needing is a measuring transducer, which converts the 4-20mA to a 0-10V signal.

 

[Joe Walsch]

Hi,

Thank you for the fast response to my question. It makes sense to use a measuring transducer. Do you know which one would be a good fit for my purpose? I have already tried using a Phoenix Contact MCR-SL-U-I-UI-SL and an MCR-SL-I-U-4, but they didn't work. Are there measuring transducers specifically for 2-wire 4-20 mA that convert to 0-10V?

 

[oliver.tonn]

The latter only works with a 4-wire sensor. For the first one I couldn't find any information.
A 2-wire sensor must be supplied by the transducer. A 4-wire sensor has connectors for a power supply.
I'm sorry, but I can't tell you which transducer you can use.

 

[Joe Walsch]

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You helped me a lot, no problem. Thank you so much!

 

[PN/DP]

I initially connected the U+ from the sensor to IN1 of the PLC and U- from the sensor to ground, but it didn't work.

connect 2-wire-I-sensor to 0-10V Input with resistor as I-to-U-converter

           +------------+        +---------------+
+24V ------|+  Sensor  -|----+---|IN             |
           +------------+    |   |      MIO      |
                            +-+  |               |
                            | |  |               |
                    500 Ohm | |  |               |
                            +-+  |               |
                             |   |               |
  0V ------------------------+---|GND            |
                                 +---------------+

I have already tried using a Phoenix Contact MCR-SL-U-I-UI-SL and an MCR-SL-I-U-4, but they didn't work.

Both transducers should work if the 2-wire sensor is connected correctly.

connect 2-wire-I-sensor to MINI MCR-SL-UI-UI or MINI MCR-SL-I-U-4

           +------------+        +---------------+
+24V ------|+  Sensor  -|--------|1 IN U,I       |
           +------------+        |      MCR..    |
                                 |               |
  0V ----------------------------|2 GND          |
                                 +---------------+