SIMATIC IoT2000, Input Module Sink/Source, 10x DI, ARDUINO Shield for SIMATIC IoT2020 and IoT2040 The SIMATIC IOT2000 Input Module Sink/Source with its ten digital inputs enables the direct connection of non-time-critical sensor data to the SIMATIC IOT2000. Due to the potential-free design of the inputs, the input circuit can be configured either as sink or source. The module can read each channel individually as sink/source (or M- or P-reading) without additional configuration.