Rockwell-automation 1794-ASB/E Remote I/O Adapter Module User Manual Instrukcja Użytkownika Pobierz pdf (Strona 53)

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Publication 1794ĆUM009D-EN-P - April 2004

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In this chapter, we tell you:

• about the indicators on the module front plate

• how to use the indicators for troubleshooting the module

Three conditions can cause the remote I/O adapter to declare a

communication fault.

• no remote I/O (link) communication for more than 100ms

• no commands issued to this address over the remote I/O link

within the last 255 link transactions

• communication is lost to a module when Rack Fault Select is

enabled

When any of these conditions exist, the adapter will:

• reset all digital outputs or leave them in their last state (depending

on the position of the last state switch, S2-1). Refer to page 2–9

for an explanation of analog module responses.

A communication fault will be automatically cleared by a command

from the processor if PRL (processor restart lockout) is not selected,

or by pressing the reset switch on the front of the module if PRL is

selected.

Adapter Fault

Local Fault

Adapter Active

ACTIVE

PWR

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FAULT

LOCAL

FAULT

ADAPTER

Power ON/OFF

Reset Switch

Important: Cycling power to the adapter will also reset faults.

However, any queued block transfers will be lost, and

all outputs will turn off, regardless of the position of the

last state switch.

The module has indicators on the front plate as shown below. Use

these indicators for troubleshooting the module. The following tables

describes problems that may occur, probable causes, and

recommended courses of action.

Chapter Objectives

Fault Conditions

Troubleshooting with the

Indicator Lights

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 71 72

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