Saia-Burgess
Controls Ltd.
Hardware Manual for the PCD3 Series│Document 26/789; Version E 5│31.01.2005
Hardware
PCD3.A251
5-37
5
LED’s and connection terminals
Output diagram and terminal designation
Relay energized (contact closed): LED on
Relay reset (contact open):
LED off
24 VDC must be connected to terminals “+” and “–”.
Watchdog: This module can be used on all base addresses; there is no interaction
with the watchdog for the CPUs.
LED 0...7 Terminals
Description
Label
Address
Label
PCD3.A251
8 Rel. Outputs 2A
/24
VDC
1
3
5
7
9
11
13
15
17
19
21
23
0
2
4
6
8
10
12
14
16
18
20
22
A0
A0
A1
A2
A2
A3
A4
A4
A5
A6
A7
+
co
nc
no
co
nc
no
co
nc
no
co
co
no
nc
co
no
nc
co
no
nc
co
no
no
A0
A1
A1
A2
A3
A3
A4
A5
A5
A6
A7
–
0 1
22 23
�
�
�
�
�
�
�
�
A
2
5
1
I/O
B
us
P
C
D
B
us
Address
LED A7
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
-
+ co no co no co no nc nc no co co no nc nc no co co no nc nc no co
24 VDC
A7
A6
A5
A4
A3
A2
A1
A0
Terminals
Relay contacts
LED
Output
0
A0
1
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
