Technical data of the digital inputs/outputs if used as inputs

Number of channels per module	Max. 8 digital inputs
Reference potential for all inputs	Terminal 1.9 (minus pole of the process supply voltage, signal name ZP)
Input current per channel
Input voltage +24 V	Typ. 5 mA
Input voltage +5 V	> 1 mA
Input voltage +15 V	> 5 mA
Input voltage +30 V	< 8 mA
Input type acc. to EN 61131-2	Type 1
Input delay (0->1 or 1->0)	Typ. 2 µs
Input signal voltage	24 V DC
Signal 0	-3 V…+5 V *
Undefined signal	> +5 V…< +15 V
Signal 1	+15 V…+30 V
Ripple with signal 0	Within -3 V…+5 V *
Ripple with signal 1	Within +15 V…+30 V
Max. cable length
Shielded	1000 m
Unshielded	600 m

*  Due to the direct connection to the output, the demagnetizing varistor is also effective at the input (see figure) above. This is why the difference between UPx and the input signal may not exceed the clamp voltage of the varistor. The varistor limits the voltage to approx. 36 V. Following this, the input voltage must range from - 12 V to + 30 V when UPx = 24 V and from - 6 V to + 30 V when UPx = 30 V.