Figure 5.1 – Terminal block contacts assignments 5.4 Connection of switching devices and sensors CAUTION Supply voltage on the device inputs (pins 9 – 12 at the terminal block) must be in range from 0 to 24 V. NOTICE To supply the switching devices and sensors to the screw terminal block of the device is provided with supply voltage (pin 13 of the terminal block). If power consumption of input exceeds the load capacity of the built-in power supply (24 V), then an external power supply with an output voltage of 12 to 34 V (24 V recommended) must be used for powering. 21