Reference Potential For Control Inputs/Switch Test Inputs - HBM MP85A Series Operating Manual

Electrical connection
The control outputs are available at screw terminals 3 and 4 and are
electrically isolated from the internal supply voltage:
S At screw terminal 3: Control outputs 1 ... 4
S At screw terminal 4: Control outputs 5 ... 8 (for versions with ‐S only)
5.4.3

Reference potential for control inputs/switch test inputs

MP85A process controller
Screw terminal 3
Fig. 5.3 Connection of control input/switch test input
The control inputs are available at screw terminals 3 and 4 and are
electrically isolated from the internal supply voltage and from the control
outputs.
S At screw terminal 3: Control input 1
S At screw terminal 4: Control inputs 2 ... 5 (MP85A//MP85A-S only)
For the control inputs, connect an external reference potential (
the control input signals refer.
Information
The digital inputs of the MP85A process controller are edge-controlled on the
transition from 0 V to control voltage (e.g. 24 V). The set digital input function is
implemented only once with the rising edge. The subsequent presence of
control voltage does not cause any further action.
26
Switch event/test specimen
IN 3
IN
A0293_06_E00_03 HBM: public
24 V (10 ... 30 V)
0 V
), to which
IN
MP85A