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.
▷ Connect your RevPi either to your network or set it up in desktop mode.
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 Software Compatibility.
Step 1: Creating a New Project in CODESYS #
▷ Open CODESYS on your PC.
▷ Create a new standard project.
▷ Select CODESYS Control for Linux ARM or ARM64 depending of your image version
▷ Choose one of the EN 61131-3 programming languages for PLC.
Step 2: Configuring 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.
Step 3: Writing the Code #
▷ 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.
▷ Open PLC_PRG in the device tree.
❯ This opens 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.
Step 4: Running the Application #
▷ xref:…/tutorial/codesys-blinkinglight.adoc#_step_5_connect_the_revpi_in_codesys[Connecting the RevPi in CODESYS]
