Eaton XN300 Manual

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18 Digital input/output module XN-322-16DIO-PD0518.3 Wiring118 XN300 slice modules 06/16 MN050002 EN www.eaton.com18.3 WiringFour digital inputs can be wired to each of the two X1 and X2 connectors,while four digital outputs can be wired to each of the two X3 and X4 connec-tors.18.3.1 Digital inputsFour digital inputs can be wired to the X1 connector and another four digitalinputs can be wired to the X2 connector.The digital input, as defined in the EN 61131-1 type with a 5-ms input delay,is particularly suitable for connecting electronic switching devices, includingrelay contacts, pushbuttons, switches, etc. It is used to convert a signal withtwo possible states into a one-bit binary number.18.3.2 Connecting the power supplyThe cross-sectional area of the +24 V cable used to supply power at X5 mustbe sized for the maximum total current drawn by all the outputs.It is impermissible to apply a voltage, at any output, that exceeds the supplyvoltage by more than 0.7 V.18.3.3 Connecting EN 61131-2 short-circuit proof digital outputsFour digital outputs can be wired to the X3 connector and another four digitaloutputs can be wired to the X4 connector.The outputs are able to drive twice their rated operational current brieflywhen driving loads with higher inrush currents.18.3.4 Suppressor circuit for inductive loadsHigh induced voltages may be produced when inductive loads are switchedoff. Because of this, the transistor outputs have internal suppressor circuitsto +24 V.As shown in the diagram below, the voltage when switching off inductiveloads is limited to -29 V. In order to prevent system malfunctions caused byvoltage peaks (e.g., coupling on analog cables), it is recommended to use asuppressor circuit (RC suppressors or flyback diodes) directly on inductiveloads.