8
Rockwell Automation Publication 1753-IN001C-EN-P - June 2010
Devices with their own dedicated power supply can also be connected. Connect the reference
pole of the external power supply to the L- reference pole of the input.
The safe state of an input is indicated by a 0 signal being passed to the user program logic. If the
test routines detect a fault in the digital inputs, a 0 signal is processed in the user program for the
defective channel. When a fault occurs, the inputs are switched off (0).
Follow the closed-circuit principle for external wiring when connecting sensors. To create a safe
state in the event of a fault, the input signals revert to the de-energized state (0). The FAULT
status indicator activates.
Digital Input Terminals
TIP
For more information on input wiring, see the GuardPLC Controller Systems
User Manual, publication number
1753-UM001
.
1
2
3
4
5
6
1
2
3
4
1
L-
L-
L-
L+
L+
L-
DO
2
(2A)
3 4
1
LS+-
LS+
LS+
LS+
LS+
L-
D1
2 3 4
5
6
13
14 15 16 17 18
5
L-
D1
6 7 8
19
20 21 22 23 24
9
L-
D1
10 11 12
25
26 27 28 29 30
13
L-
D1
14 15 16
31
32 33 34 35 36
17
L-
D1
18 19 20
37
38 39 40 41 42
19
20 21 22 23 24
13
14 15 16 23 24
25
26 27 28 29 30
31
32 33 34 35 36
37
38 39 40 41 42
7
8
9
10 11 12
7
8
9
10
5
L-
L-
DO
6
(2A)
7 8
11 12
COMM1
MODBUS
RS-485
24V DC
COMM2
COMM3
RUN
24 V DC
GuardPLC Ethernet
10/100 BaseT
PROG
ERROR
FAULT
FORCE
BL
OSL
PROFIBUS
3
(—)
4
(—)
3
(—)
4
(—)
1753-L28BBBM
20 DC Inputs
8 DC Outputs
1
LS+-
L-
D1
2 3 4
13
14 15 16 17 18
13
14 15 16 23 24
L-
L-
L+
L+
24V DC
24V DC
Power
Supply
COM
COM
+
24V DC
Power
Supply
COM
+
+
Light Curtain
(or any Safety Input)
Connection of Devices with Dedicated Power Supplies
1
L
S
+-
L
S
+
L
S
+
L
S
+
L
S
+
L-
DI
2 3 4
13 14 15 16 17 18
5
L-
DI
6 7 8
19 20 21 22 23 24
9
L-
DI
10 11 12
25 26 27 28 29 30
13
L-
DI
14 15 16
31 32 33 34 35 36
17
L-
DI
18 19 20
37 38 39 40 41 42
19 20 21 22 23 24
13 14 15 16 17 18
25 26 27 28 29 30
31 32 33 34 35 36
37 38 39 40 41 42
