18 Digital input/output module XN-322-16DIO-PD05
18.3 Wiring
118
XN300 slice modules
06/16 MN050002 EN
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18.3 Wiring
Four 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 inputs
Four digital inputs can be wired to the X1 connector and another four digital
inputs 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, including
relay contacts, pushbuttons, switches, etc. It is used to convert a signal with
two possible states into a one-bit binary number.
18.3.2 Connecting the power supply
The cross-sectional area of the +24 V cable used to supply power at X5 must
be sized for the maximum total current drawn by all the outputs.
It is impermissible to apply a voltage, at any output, that exceeds the supply
voltage by more than 0.7 V.
18.3.3 Connecting EN 61131-2 short-circuit proof digital outputs
Four digital outputs can be wired to the X3 connector and another four digital
outputs can be wired to the X4 connector.
The outputs are able to drive twice their rated operational current briefly
when driving loads with higher inrush currents.
18.3.4 Suppressor circuit for inductive loads
High induced voltages may be produced when inductive loads are switched
off. Because of this, the transistor outputs have internal suppressor circuits
to +24 V.
As shown in the diagram below, the voltage when switching off inductive
loads is limited to -29 V. In order to prevent system malfunctions caused by
voltage peaks (e.g., coupling on analog cables), it is recommended to use a
suppressor circuit (RC suppressors or flyback diodes) directly on inductive
loads.
Summary of Contents for XN300
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