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9.5 Digital inputs
The device has 4 digital inputs.
The device recognizes an input signal at the digital
input if:
·A voltage of at least 18 V and at most 28 V DC
(typically at 4 mA) is present.
·A current of at least 0.5 mA and at most 6 mA
flows.
For voltages from 0 to 5 V and currents less than
0.5 mA there is no input signal.
+
17 18 19 20 21
4 3 2 1
Digital input
Supply
voltage
INFORMATION
Observe the polarity of the supply voltage!
ATTENTION
Transmission error and material damage due to
electrical malfunction.
With a cable length of more than 30 m, there is an
increased probability of transmission errors and
damage to the device due to atmospheric dis-
charge!
Use shielded cables for the connections to the
digital inputs and outputs!
17
18
19
2k21
20
2k21
2k21
2k21
Digital
Input 4
2k21
2k21
Digital
Input 3
Digital
Input 2
21
2k21
2k21
Digital
Input 1
-
+
24 VDC
S4
S3
External
auxiliary voltage
UMG 801
Digital inputs 1-4
S2
S1
S1 S2 S3 S4
Fig. Example for the connection of external switching contacts
S1 - S4 to digital inputs 1, 2, 3 and 4.
INFORMATION
For more information on configuring the digital
inputs, see section „12. Digital inputs and out-
puts“ on page 70.
Functions for the digital inputs can be configured
easily and clearly in the GridVis
®
software (see www.
janitza.de).