Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 135)

Chapter 9
Maintenance and Troubleshooting
9–5
Problem Probable Cause(s) Corrective Action(s)
Unable to read a label. Improperly positioned scan
head or labels.
Decoder is improperly
programmed.
Poor quality labels.
Loose cables or connections.
Defective or improperly
adjusted scan head.
Refer to scan head user’s manual.
Check the configuration of the decoder to
make sure parameters are set for your
application. Check:
•
Trigger mode.
•
Code type.
•
Length of code.
•
Minimum number of reads before valid
read (capture count).
•
Use of check digit.
Verify by either checking labels or using labels
known to be within AIM specifications.
Check cables and connections.
Refer to scan head user’s manual.
Output modules do not operate. Improperly defined
parameters.
Improper connections.
Output module fuse blown
Defective output module.
Review setup configuration to verify that
correct parameters have been entered.
Check connections to the output modules.
Verify that power is present. Check polarity of
DC modules.
Determine reason for fuse blowing, correct
problem, and then replace fuse.
Replace module.