In this example, we will read the temperature using the RTD channel of the RevPi AIO and output the measured value to an analog output channel connected to a digital display.
Prerequisites #
Hardware #
✓ RevPi Connect 4
✓ RevPi AIO
✓ Temperature Sensor (e.g., PT1000, 4 Wire)
✓ Digital Display (e.g., ITP11 Process Indicator)
▷ Connect the Temperature Sensor (PT1000) to the RTD channel 1 of the RevPi AIO.
▷ Connect RevPi Connect 4 and RevPi AIO using the PiBridge.
▷ Ensure the power supply is properly connected.
▷ Operate your RevPi either in headless mode or connect a monitor, mouse, and keyboard to it.
For detailed instructions about how to set up your system, see Getting Started.
Software #
✓ CODESYS Development System installed on your PC
To ensure a compatible system with suitable software, see CODESYS System Requirements.
Step 1: Create a New Project in CODESYS #
▷ See how to create a project here and adapt with your Hardware.
▷ In this example we use the EN 61131-3 programming languages for PLC.
Step 2: Configure the RTD Channel and Output Channel #
▷ ensure that the temperature sensor to RTD channel 1 on the RevPi AIO is connected.
▷ Configure RTD Channel 1 for PT1000 - 4 wire temperature measurements.
❯ See RevPi AIO RTD channels.
▷ Connect the digital display (ITP11 Process Indicator) to analog output channel 1 on the RevPi AIO.
▷ Configure the analog output channel to use 4 … 20 mA current.
❯ See RevPi AIO analog outputs.
Step 3: Write the Code for reading Temperature from RTD channel und wrie to the Output Channel #
▷ Assign the variable name RTD_CH1 to the RTD Channel 1 with data type INT
▷ Assign the variable name iAIO_ch2 to the Output Channel 2 with data type INT
▷ Double-click on PLC_PRG in the device tree. ❯ This will open the program window PLC_PRG where the Code for reading Temperature from RTD channel und write to the Output Channel of to the RevPI AIO shall be written in ST.
