User Manual

PD42-x-1241 Hardware Manual • Hardware Version V1.00 | Document Revision V1.23 • 2019-JAN-02
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33pF
22k
10k
2k2
+3V3
microcontroller
microcontroller
IN1
IN2
+5V
TMCM-1241
or
pull-up
enabled
or
pull-up
disabled
+5V...24V
+5V
Figure 7: Digital inputs IN1 and IN2
7.3 HOME/STOP_L/STOP_R switch inputs
The PD42-x-1241 offers two optically isolated inputs which can be used as left (STOP_L) and right (STOP_R)
stop switch inputs. When enabled in software the STOP_L switch input will stop motor movement in
negative direction (step counter decreasing) while activated. Likewise the STOP_R switch input will stop
motor movement in positive direction (step counter increasing) while activated.
680
6k8
2k2
+3V3
microcontroller
TMCM-1241
STOP_L,
STOP_R
ISO_COM
+24V_ISO
GND_ISO
or
+24V_ISO
GND_ISO
Figure 8: Stop switch inputs
A separated / isolated supply may be used for the switches - as indicated in the drawing (+24V_ISO and
related GND_ISO) - but, same supply as for the PD42-x-1241 can be used, also, of course.
7.4 External incremental encoder input
The PD42-x-1241 offers an integrated hall-sensor based magnet encoder. In addition, an external incre-
mental A/B encoder may be connected to the two digital inputs IN1 and IN2. Encoder with push-pull
signals (e.g. +5V TTL) and open-drain output signals are supported (single-ended). For open-drain outputs
the internal pull-ups should be activated in software (default mode).
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