Rockwell Automation 1771-IR , D17716.5.76 RTD INPUT MODULE - Manual (Page 42)

Chapter
8
8Ć1
Troubleshooting
We describe how to troubleshoot your module by observing LED indicators and
by monitoring status bits reported to the processor.
At power–up, the module momentarily turns on both indicators as a lamp test,
then checks for
correct RAM operation
EPROM
operation
EEPROM operation
a valid write block transfer with configuration data
Thereafter, the module lights the green RUN indicator when operating without
fault, or lights the red fault (FLT) indicator when it detects fault conditions. If
the red FLT indicator is on, block transfer will be inhibited.
The module also reports status and specific faults (if they occur) in every
transfer of data to the PC processor. Monitor the green and red LED indicators
and status bits in word 1 of the BTR file when troubleshooting your module.
Figure 8.1
LED Indicators
RUN
FLT
RTD
INPUT
Green RUN LED
Red Fault (FLT) LED
This module uses a read block transfer to transmit data and to monitor module
and data status. Word 1 of the read block transfer data file contains module
status, power–up, and data out–of–range information. Word 2 contains data
polarity and overflow information. Words 3 through 8 are data words.
Chapter Objective
Diagnostics Reported by the
Module