This module appears as a B863 module when configured. This means the module requires four 16–bit words (1x registers), as shown in the data registers diagram below. The first two words contains the state of the input points. The second two words contain the condition of the field wiring. If a broken wire is detected on input point, then a one is displayed in input register (1x+32) at its position. When the fault is fixed, a zero appears in the bit. A one indicates a detected fault, whereas, a zero indicates normal operation of that input point.