37
W&T
Digital-I/O Extender Sets
Subject to error and alteration
Digital Outputs
The basic wiring of the switching outputs for the Digital-IO
Extender Set can be seen in the following illustration:
The two digital outputs of the Digital-I/O Extenders are
current sourcing. The supply voltage for the outputs may be
b6 V and +30 V DC and is provided at terminals Vdd
and GND.
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.
I/O Port
Power
Data
TxD
RxD
Fiber Optic Port
Outputs Vdd GND Inputs
1 2 + - 1 2
Vcc
AC/DC
+
-
12..24V AC/DC
6.. 30V DC
