W&T Web-IO Digital 4.0 Manual page 18

Montage und Verdrahtung
With a voltage supply of 24V, which is typical in industry, the Web IO draws approx.
100mA current.
IO channels that are configured as outputs are also supplied via VDD. The loads to
be switched must also be taken into account in the current consumption.
Input wiring
Each of the four IO channels has a plus and a minus terminal.
The signal input for IO channels that are operated as inputs is on the respective plus
terminal. When using potential-free contacts, we recommend switching the auxiliary
voltage VDD-Out via the contact on the plus terminal. In this case, the minus termi-
nals do not have to be connected. Here is an example of the wiring of input 1.
+
12 - 24V
-
GND
Alternatively, an external voltage of max. +24V DC can be applied to the plus termi-
nal, whereby voltages greater than 8V (+/-1V) are recognised as ON signal. In this
case, the reference ground must be applied to the respective minus terminal.
18
1 8
0 1 2 3
- - - -
+ + -
VCC
12 - 24V DC
Inp. = ON Outp. = ON
150mA +
Outputs: max. 4x500mA
Output Load
Power
Status
Input/Output Mode Check
and LED Test shown on Reset
Error
Reset
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URL:
Web-IO 4.0 #57733
Digital, 4xIn/Out