User Manual

PD28-1-1021 / PD28-3-1021 V1.4 Hardware Manual (Rev. 1.03 / 2018-JAN-25) 11
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3.4.1 Power, Communication and I/O Connector
An 8-pin, 2mm pitch single row connector is used for power supply, RS485 serial communication and
additional multi-purpose inputs and outputs.
Pin
Label
Direction
Description
1
GND
Power (GND)
GND
2
VDD
Power (Supply)
VDD, typ. +24V (+9V…+28V max.)
3
RS485+
Bidirectional
RS485 interface, diff. signal (non-inverting)
4
RS485-
Bidirectional
RS485 interface, diff. signal (inverting)
5
IN_0
Input
General purpose digital input,
+24V compatible, internal 20k pull-down resistor
Alternate function 1: Step input,
+24V compatible, internal 20k pull-down resistor.
Please note: the bandwidth of the low-pass (noise rejection) filter at
the input is 16kHz (-3dB) which will limit the upper step frequency
Alternate function 2: Left stop switch,
+24V compatible, internal 20k pull-down resistor
6
IN_1
Input
General purpose digital input,
+24V compatible, internal 20k pull-down resistor
Alternate function 1: Direction input,
+24V compatible, internal 20k pull-down resistor
Please note: the bandwidth of the low-pass (noise rejection) filter at
the input is 16kHz (-3dB)
Alternate function 2: Right stop switch,
+24V compatible, internal 20k pull-down resistor
7
OUT_0 / IN_2
Output / Input
Open drain output with freewheeling diode (max. 100mA)
Please note: there is a 20k pull-down resistor of the input connected
in parallel
Alternate function 1: general purpose digital input,
+24V compatible, internal 20k pull-down resistor
Alternate function 2:
home switch, +24V compatible, internal 20k pull-down resistor
8
OUT_1 / IN_3
Output / Input
Open drain output with freewheeling diode (max. 100mA)
Please note: there is a 20k pull-down resistor of the input connected
in parallel
Alternate function 1:
digital input, +24V compatible, internal 20k pull-down resistor
Alternate function 2:
analog input, 0..6.6V range, +24V survival, internal 20k pull-down
resistor
Table 3.2 8pin power, communication and I/O connector
3.4.1.1 Power supply
For proper operation care has to be taken with regard to power supply concept and design. Due to space
restrictions the PD28-1-1021 / PD28-3-1021 includes just about 20µF/35V (TMCM-1021 V1.2) resp. 30µF/35V
(TMCM-1021 V1.4) of supply filter capacitors. These are ceramic capacitors which have been selected for
high reliability and long life time. The module includes a 24V suppressor diode for over-voltage protection.
Please take the following measures into account in order to avoid serious damage of the device:
Add external power supply capacitors!
It is recommended to connect an electrolytic capacitor of significant size (e.g. 470µF/35V)
to the power supply lines next to the PD28-1-1021 / PD28-3-1021!
Rule of thumb for size of electrolytic capacitor: c = 1000
μF
A
× I
SUPPLY