SBC PCD1 Series Manual page 146

Saia-Burgess Controls AG
Input circuits and terminal designation
Depending on external wiring, this module may be used for source or sink operation.
Source operation (positive logic):
Load resistors
4k7
4k7
9 8
L
Ue : 24 V
12 V
Sink operation (negative logic):
9 8
L
Ue : 24 V
12 V
5 V
Watchdog: This module can be used on all base addresses; there is no interaction
with the watchdog on the CPUs. For details, please refer to the
which describes the correct use of the watchdog in conjunction with PCD2 compo-
nents.
Manual Manual PCD 1 / PCD 2 Series │ D ocument 26 / 737 EN22 │ 2 013-11-26
Input filter
10k
10k
1 0
E1 E0
Switch closed
(positive at input) : Input state "H" = LED on
DC
Switch open :
DC
5 V
DC
1 0
E1 E0
Switch closed
(negative at input) : Input state "L" = LED off
DC
Switch open :
DC
DC
Threshold
switch
LED
E1
E0
Input state "L" = LED off
Input state "H" = LED on
Input/output (I/O) modules
Digital input modules
I/O
Bus
Inter-
face
"Watchdog" section,
5
5-10