HBM MP85A Operating Manual page 61

MP85A process controller
NOTE
As the MP85ADP-S only has one digital switch test input, the (virtual) inputs 2
to 5 can be set via PROFIBUS commands and so the switch result displayed,
see MP85A interface description, Chapter 4.
The switch test inputs are available at screw terminals 3 and 4 and are elec-
trically isolated from the internal supply voltage and from the control outputs.
• At screw terminal 3: Control input 1
• At screw terminal 4: Control inputs 2 ... 5 (MP85A/MP85A-S only)
An external reference potential (
must be connected for the switch test processes.
The MP85A process controller digital inputs are flank controlled by
transition from 0V to control voltage (e.g. 24V). The set digital input
function is only implemented once with the rising flank. The subsequent
permanent application of the control voltage does not cause a further
action.
MP85A process controller
IN 3
Screw terminal 3
Fig. 7.2: Connection of control input / switch test input
Entry and exit sides are not needed for the switch test window type. They can
be monitored with additional process windows.
The switch coordinates displayed in the switch test window, i.e. the coordin-
ates at which the switch changes state, are stored in the statistics. In addition,
"No switching" is signaled for OK or NOK, when the switch does not change
state or when switching is repeated because multiple switching occurs
(chatter).
Switch windows can also be parameterized as windows with defined
sequences. This ensures that on/off switchings are processed in the correct
sequence.
Evaluation follows at the end of the process, i.e. evaluation in real time cannot
be selected.
A2392−5.0 en
), to which the control input signals relate,
IN
Switch event / test specimen
IN
61
24 V (10 ... 30 V)
0 V
HBM