Allen-Bradley MicroLogix 1000, User Manual

Page: 37 / 422

Wiring Your Controller
2–3
Sinking and Sourcing Circuits
Any of the MicroLogix 1000 DC inputs can be configured as sinking or sourcing
depending on how the DC COM is wired on the MicroLogix.
Type Definition
Sinking Input
The input energizes when high-level voltage is applied to the input terminal
(active high). Connect the power supply VDC (–) to the MicroLogix DC COM
terminal.
Sourcing Input
The input energizes when low-level voltage is applied to the input terminal
(active low). Connect the power supply VDC (+) to the MicroLogix DC COM
terminal.
Sinking and Sourcing Wiring Examples
I/9 I/10 DC
COM I/0 I/1 I/2 I/3 I/4 I/5 I/6 I/7 I/8 I/11 I/12 I/13 I/14 I/15 I/16 I/17 I/18 I/19 DC
COM
14–30 VDC
DC OUT
+
24V –
VDC (+) for Sourcing VDC (–) for Sourcing
VDC (–)
for Sinking
VDC (+) for Sinking
I/9 I/10 DC
COM I/0 I/1 I/2 I/3 I/4 I/5 I/6 I/7 I/8 I/11 I/12 I/13 I/14 I/15 I/16 I/17 I/18 I/19 DC
COM
14–30 VDC
DC OUT
+
24V –
VDC (–) for Sinking
VDC (+)
for Sinking
VDC (–) for Sourcing
VDC (+)
for Sourcing
Sinking Inputs
Sourcing Inputs
Sinking Inputs
Sourcing Inputs
1761-L32BWA (Wiring diagrams also apply to 1761-L20BWA-5A,
-L16BWA, -L10BWA.)
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