Safety-related digital inputs, Connection of voltage supply to input device – Rockwell Automation 1753-L32BBBP-8A GuardPLC 1800 Controller User Manual
Page 7
GuardPLC 1800 Controllers 7
Rockwell Automation Publication 1753-IN002C-EN-P - June 2010
Safety-Related Digital Inputs
The controller has 24 digital inputs whose status is indicated via status indicators when the
controller is in RUN mode.
LS+ is a voltage source that provides 24V DC for a group of eight dry contact inputs. There are
three groups on the GuardPLC 1800 controller.
If devices require 24V DC to operate and use the same power source as the controller, then wire
the outputs of the device directly to inputs on the controller.
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.
1
2
3
4
5
6
1
2
3
4
1
L-
L-
L-
L+
L+
L-
DO
2
(2A)
(2A)
3 4 5 6 7 8
5
6
7
8
9
10
20
17 18 19
11
12 13 14 15 16
11
12 13 14
1
LS+
L-
DI
2 3 4 5 6 7 8
15 16
17 18 19 20
RS-485
24V DC
3
(—)
4
(—)
10
7
8
9
24V DC
Power
Supply
COM
+
Connection of Voltage Supply to Input Device
1
2
3
4
5
6
1
2
3
4
1
L-
L-
L-
L+
L+
L-
DO
2
(2A)
(2A)
3 4 5 6 7 8
5
6
7
8
9
10
20
17 18 19
11 12 13 14 15 16
11 12 13 14
1
LS+
L-
DI
2 3 4 5 6 7 8
15 16
17 18 19 20
RS-485
24V DC
3
(—)
4
(—)
10
7
8
9
24V DC
Power
Supply
COM
+
COM
+
Light Curtain
(or any Safety Input)
Connection of Voltage Supply to Input Device
1
2
3
4
5
6
1
2
3
4
1
L-
L-
L-
L+
L+
L-
DO
2
(2A)
(2A)
3 4 5 6 7 8
5
6
7
8
9
10
20
17 18 19
11
12 13 14 15 16
11
12 13 14
1
LS+
L-
DI
2 3 4 5 6 7 8
15 16
17 18 19 20
RS-485
24V DC
3
(—)
4
(—)
10
7
8
9
24V DC
Power
Supply
COM
+
24V DC
Power
Supply
COM
+
COM
+
Light Curtain
(or any Safety Input)
Connection of Devices with Dedicated Power Supplies