Allen-Bradley 2755 User Manual download pdf (Page 56)

Installing the Wiring Base and Power Supply 3–21

Input Module Application

External Power Source

A typical input module application using external power source:

AC or DC Source

External

Input Contacts

Fuse

Recommended

–+

The module and the switch receive power from an external AC or

DC source. Although input modules may be used for package

detection, use the package detect input (see next page) whenever

possible. See Appendix B for available Allen-Bradley fuse, diode

and resistor terminal blocks.

Internal Power Source

A typical input module application using the package detect +12V

internal power source and Catalog No. 2755-IB5S input module:

External

Input Contacts

To +12V

To +

To -

GND

The module and the switch receive power from the package detect

+12V source. Only use input module Catalog No. 2755-IB5S for

this application.

Important: Package detect terminals are not powered until a Reader

is installed on the wiring base.

Note: The circuit must not draw more than 50mA from the Package

Detect terminal block.

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Allen-Bradley 2755 User Manual Page 56