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Sinking and sourcing circuits, Sinking and sourcing wiring examples – Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers User Manual

Page 37

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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.)