46
W&T
Digital-I/O Extender Sets
Digital Outputs
The basic wiring of the switching outputs for the Digital-IO
Extender Set can be seen in the following illustration:
The digital outputs of the Digital-I/O Extender Sets are current
sourcing and apply the voltage brought to Vdd to the output
terminals. Each of the outputs can switch a maximum current
of 0.5A. If loads with an inductive component (e.g. relays,
contactors, solenoids etc.) need to be switched, the outputs
must be additionally protected using recovery diodes.
The outputs have thermal overload protection and are short
circuit protected. In the OFF state a very low current of
approx. 10µA is used to check whether the outputs are
switched to a load. If LEDs are connected to the outputs, this
can result in a slight glow even in the rest state.
1
Fiber Optic Port
Link
Vdd
GND
TxD
RxD
12..24V DC
+
-
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
Outputs
Inputs
