Hello everyone! I recently got my hands on a Revolution Pi Connect 4 along with the MIO module and I am interested in collecting process data from a WIKA A-10 pressure sensor with a 2-wire, 4-20 mA output. I am seeking a comprehensive guide on connecting this sensor to the PLC and retrieving the data. I initially connected the U+ wire from the sensor to IN1 on the PLC and the U- wire to ground, but it did not yield results. Would I require 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? It is important to note that the analog input of the MIO module is designed to measure voltage (0-10V) and does not support current directly. Any detailed instructions on the correct wiring and configuration procedures would be greatly appreciated. For reference, here is the datasheet for the Digital & Analog Input module I am using: [insert link] and here is the datasheet for the WIKA A-10 sensor: [insert link]. Thank you in advance for your help!
In this demonstration, I illustrate how I linked the PT100 temperature sensor's output to a 4-20mA converter, ultimately feeding into a 0-10V input by integrating a 500ohm resistor. Additionally, the datasheet for the converter is provided for your reference. Incorporating the 500ohm resistor acts as the load for the 4-20mA signal, enabling the measurement of the voltage across the resistor. Typically, a voltage input exhibits high resistance, making the 500ohm resistor the critical element in the circuit. By applying Ohm's Law and calculating V = IR (voltage equals current multiplied by resistance), you can determine that 20mA multiplied by 500 ohms equals 10V. It is likely that the 4-20mA sensor is isolated, making the resistor method effective. However, if you prefer additional signal isolation, utilizing the MCR-SL-U-I-UI-SL is also a valid option.
Hey there! You're correct in knowing the MIO module does not support current directly. For interfacing your WIKA A-10 4-20 mA sensor with the Revolution Pi Connect 4 to collect process data, you indeed need a current to voltage converter, just like the Phoenix Contact MCR-SL-U-I-UI-SL you mentioned, to convert the 4-20 mA sensor output to a 0-10V signal for the module to read. Doing this, and making sure your IN1 is in 'AI' (Analog Input) mode, should get you started. Do remember to calibrate your converter to ensure your readings are accurate. Moreover, follow safety precautions while dealing with the live circuit. Looking forward to hearing about your progress!
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Answer: Answer: To connect the sensor to the MIO module, you may need additional signal conditioning to convert the 4-20 mA output to a 0-10V signal, as the MIO module's analog input is designed for voltage measurement.
Answer: Answer: No, you would typically require additional signal conditioning, such as the Phoenix Contact MCR-SL-U-I-UI-SL, to convert the current output from the sensor to a voltage signal compatible with the MIO module.
Answer: Answer: Detailed instructions on the correct wiring and configuration procedures can be found in the datasheets of the MIO module and the WIKA A-10 sensor. It is important to ensure the signal conversion from current to voltage is done properly.
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