Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Digital output modules
Input/output (I/O) modules
6-31
6
LEDs and connection terminals
Bus connector
Bus interface
Relays
Contact protection
LEDs
Screw terminals
Relay contacts
Supply 24 VDC for
Relay coils
9
8
7
6
5
4
3
2
1
0
A0
A1
A2
A3
A0
A1
A2
A3
Output circuits and terminal designation
A0
0
1
8
9
A3
6
7
I/O Bus
PCD Bus
Contact
protection
Relay
contacts
Terminals
24 VDC Isolated contacts
Adress
LED A3
Relay energized (contact closed): LED on
Relay reset (contact open):
LED off
24 V
DC
must be connected to the +/- terminals.
With an open relay contact, the current leakage through the contact protection is
0.7 mA
(at 230 V / 50 Hz). This should be taken into account for smaller AC loads.
If this is too high, it is recommended to use a PCD2.A220 module (without contact
protection).
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
"Watchdog" section
, which describes
the correct use of the watchdog in conjunction with PCD2 components.
LED
Output
0
O0
1
O1
2
O2
3
O3