Rockwell Automation 1771-KA2 Communication Adapter Module User Manual

Page 121

Start–up and Troubleshooting

Chapter 9

9-19

REMOTE/LOCAL FAULT Indicator ON

As recommended in chapter 7, some indicator must be controlled by the
status of the REMOTE and LOCAL FAULT bits at each station processor.
Should this indicator go ON, connect and initialize a programming
terminal and follow these procedures to isolate the source of the fault
condition. (The steps of this procedure are outlined in the example of
Figure 9.7.)

Figure 9.7
REMOTE/LOCAL FAULT Troubleshooting Example

055 01

010 00

055 00

Local Fault
Status

Indicator

Output

Instruction intensified. Thus Local
Fault Status Bit, 05500, is OFF.

055 00

03200

03201

032 02

032 03

032 04

032 05

032 06

032 07

Status

Local Fault

Instruction normal intensity. Thus this bit is ON.

OFF

027 07

03112

023 00

052

000

020

000

022

000

Bit

Start

Code

Command

Using the SEARCH functions, display the rung of program that
controls the external FAULT indicator device. Determine whether a
status bit indicates that either a REMOTE or LOCAL FAULT bit is
set ON.

Using the SEARCH functions, display the rung of program that
examines either the REMOTE or the LOCAL FAULT bits, and
controls a status bit or bits based on FAULT bit states.

Observe the individual instructions of this rung to detect any change
in FAULT bit status.

When you use the rungs recommended in Figure 7.6, EXAMINE OFF
instructions address each fault bit. When these instructions are displayed