Rockwell-automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual Bedienungsanleitung PDF herunterladen (Seite 29)

27 Publication 1794-UM061A-EN-P - July 2006

Chapter

About the FLEX I/O Diagnostic Output Module

Introduction

In this chapter, you will learn about the diagnostic output module, cat. no.

1794-OB16D.

About the 1794-OB16D

Diagnostic Output Module

The 1794-OB16D diagnostic output module provides sixteen 24V dc sourcing

outputs with open-wire, short-circuit, and user supply reverse polarity

diagnostic features. The module monitors current and voltage at each output

channel.

The module detects:

• an open fault if no current is present at the output terminal.

• a short fault if no voltage is present at the output terminal.

• a reverse-polarity fault if reverse voltage is applied.

When an open or short fault is detected:

• the corresponding channels red indicator is illuminated.

• the module’s red fault indicator is illuminated.

• the module’s open or short error bit is set.

• the module error bit is set.

When a user supply reverse-polarity fault is detected:

• the modules red fault indicator is turned on,

• and the reverse error bit is set.

• the module error bit is set.

For Information About See Page

About the 1794-OB16D Diagnostic Output Module 27

Diagnostic Fault Detection 29

Module Protection Functions 30

Module Limitations 32

Configure Your Output Diagnostic Module 32

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Rockwell-automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual Bedienungsanleitung Seite 29