Simga2N Traction Advanced Manual– V1.3 Page 24 (166) ©2021 DMC GmbH Herten Germany
Active High digital inputs
For using Active High digital input The DMC Sigma2 controller must be setup for active high digital inputs by setting the
parameter “M2-8Digital inputs active low/high ”ActvL/H”” to 1.
Using a mechanical switch
An active high digital input can be activated using a simple mechanical switch. The switch is wired between the B+ or
Vbatt terminal and one of the digital inputs. To signal that the switch is activated, a lamp can be connected between
the digital input and the B- or GND terminal.
(lamp is optional)
Using an electronic switch supplied with more than 12V
An active high digital input can be activated using an electronic switch. When the electronic switch is powered with a
supply voltage greater than 12V, for example Vbatt, the digital output can be directly wired to one of the digital inputs.
Using an electronic switch supplied with less than 12V
An active high digital input can be activated using an electronic switch. When the electronic switch is powered with a
supply voltage less than 12V, the digital output must drive a relay, which in turn switches the B+ or Vbatt voltage to one
of the digital inputs.
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