Rockwell-automation 1766-Lxxxx MicroLogix 1400 Programmable Controller User Manual download pdf (Page 46)

32 Rockwell Automation Publication 1766-UM001H-EN-P - May 2014

Chapter 3 Wire Your Controller

This product is intended to be mounted to a well grounded mounting surface

such as a metal panel. Refer to the Industrial Automation Wiring and Grounding

Guidelines, publication 1770-4.1

, for additional information. Additional

grounding connections from the mounting tab or DIN rail, if used, are not

required unless the mounting surface cannot be grounded.

Wiring Diagrams

The following illustrations show the wiring diagrams for the MicroLogix 1400

controllers. Controllers with DC inputs can be wired as either sinking or sourcing

inputs. (Sinking and sourcing does not apply to AC inputs.) Refer to Sinking and

Sourcing Wiring Diagrams on page 36.

The controller terminal block layouts are shown below. The shading on the labels

indicates how the terminals are grouped.

ATTENTION: All devices connected to the RS-232/485 communication port must be referenced to controller

ground, or be floating (not referenced to a potential other than ground). Failure to follow this procedure may result

in property damage or personal injury.

• For 1766-L32BWA and 1766-L32BWAA controllers, the COM of the sensor supply is also connected to chassis

ground internally. The 24V DC sensor power source should not be used to power output circuits. It should only be

used to power input devices.

• For 1766-L32BXB and 1766-L32BXBA controllers, the VDC NEUT or common terminal of the power supply is also

connected to chassis ground internally.

TIP

Use all four mounting positions for panel mounting installation.

ATTENTION: Remove the protective debris strip before applying

power to the controller. Failure to remove the strip may cause the

controller to overheat.

ESC

OK

Grounding stamping

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