8A Redundant Power Supply Module 5.1 V DC Output Voltage Modicon Quantum 140CPS22400

Understanding and Using Cut Wire Detection

If the electrical current between the input and the sensor is more than 1 mA, the wire is detected as not cut. If this current is less than 1 mA, the wire is detected as broken and the corresponding input’s red LED is lit.
If you install dry contact sensors, the corresponding input’s red LED will be lit whenever the contact is open and the current will be at 0 mA. To solve this and use cut wire detection properly, Schneider Electric recommends installing a pull-up resistor on the sensors so that the minimum current of 1 mA will be reached. You can use a 15 kohms pull-up resistor or work out the value you need. See the sensor
example in the illustration above.

Illustration

The following figure shows the wiring diagram for the 140CRP93100 module

power supply: 24 VDC
fuse: 1 A fast blow fuse
pull-up resistor (in sensor example): 15 kOhms
NOTE: There is only one group of 16 inputs. All common 24 V are internally connected and all common 0 V are also internally connected. The two pins of a same input (e. g: pin 1 and 2 for input 1) are internally connected too so that you can use either the right pin or the left one.