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Wire diagrams, Grounding guidelines, Terminal block guidelines – Rockwell Automation 1769-HSC Compact High Speed Counter Module User Manual

Page 14

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14 Compact I/O High-speed Counter Module

Publication 1769-IN030B-EN-P - October 2010

Grounding Guidelines

This product is intended to be mounted to a well-grounded mounting surface, such as a
metal panel. Additional grounding connections from the module’s mounting tabs or
DIN rail (if used) are required only when the mounting surface is non-conductive and
cannot be grounded.

Keep shield connection to ground as short as possible.

Ground the shield drain wire at the 1769-HSC module’s input end only.

Refer to the Industrial Automation Wiring and Grounding Guidelines,
publication

1770-4.1

, for additional installation requirements

Terminal Block Guidelines

For optimum accuracy, limit overall cable impedance by keeping cable as short as
possible. Locate the module as close to input devices as the application permits.

Tighten terminal screws with care. Excessive tightening can strip a screw.

Wire Diagrams

The following pages show wiring examples for a differential encoder, single-ended encoder,
and discrete device.

Figure 4 - Differential Encoder Wiring

(1)

Refer to your encoder manual for proper cable type. The type of cable used should be twisted-pair, individually shielded
cable with a maximum length of 300 m (1000 ft).

A

A

B

B

Z

Z

A1(+)

A1(–)

B1(+)

B1(–)

Z1(+)

Z1(–)

GND

VS

+VDC

COM

Cable

(1)

Power
Supply

Allen-Bradley
845H Series
Differential
Encoder

Shield/Housing
Connect only if housing is electronically
isolated from the motor and ground.

Shield

Module Inputs

Earth