Digital input terminals, Terminals accommodate wires up to 1.5 mm – Rockwell Automation 1753-IB20XOB8 GuardPLC Digital Input/Output Module Installation Instructions User Manual
Page 8
8 GuardPLC Digital Input/Output Module
Rockwell Automation Publication 1753-IN003C-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. 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) and the FAULT indicator
is activated.
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). Although the
external line is not monitored, a wire break is interpreted as a safe 0 signal.
Digital Input Terminals
Terminals accommodate wires up to 1.5 mm
2
(16 AWG). See the terminal torque specifications
. Digital inputs (DI) are connected to these terminals.
Terminal Number
Designation
Function
13
LS+
Sensor supply for inputs 1…4
14
1
Digital input 1
15
2
Digital input 2
16
3
Digital input 3
17
4
Digital input 4
18
L-
Reference pole
L-
L-
L+
L+
1
LS+
LS+
LS+
LS+
LS+
L-
D1
2 3 4
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
1
L-
L-
DO
2 3 4
(2A)
1
2
3
4
5
6
1
2
3
4
5
6
7
L-
L-
DO
8 9 10
(2A)
7
8
9
10 11 12
7
8
9
10 11 12
25 26 27 28 29 30
31 32 33 34 35 36
37 38 39 40 41 42
24V DC
RUN
24 V DC
PROG
ERROR
FAULT
FORCE
BL
OSL
GuardPLC Ethernet
10/100 BaseT
1 (—)
2
(—)
1753-IB20OXB8
20 DC Inputs
8 DC Outputs
15
L-
L-
L+
L+
24V DC
24V DC
Power
Supply
COM
COM
+
24V DC
Power
Supply
COM
+
+
Light Curtain
(or any Safety Input)
1
LS+-
L-
D1
2 3 4
13
14 15 16 17 18
13
14 15 16 23 24
Connection of Devices with Dedicated
Power Supplies
1
LS+-
LS+
LS+
LS+
LS+
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