Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 104)

7–3 Maintenance and Troubleshooting
Publication 2755-6.9
Problem Probable Cause (s) Corrective Action
1. Triggering/timeout out of
sync.
1. Review triggering and timing.
Decode rate okay
but getting only no
read messages in
triggered mode
2. Object detector or
another reader
interfering with reads.
2. Remount, eliminate interference, or shielding.
(Many object detectors emit pulsed infrared
signals that can seriously degrade the decode
rate if they shine into the reader or onto the
bar code label when it is being read.)
3. Window dirty or
obstructed.
3. Clean or remove obstruction.
Previous label
read, but
subsequent label 1. Reader configured in
Continuous Read 1
Output.
1. Scan a label that contains different data than
that of the one being read.
subsequent label
will not read.
2. Reader in polled mode. 2. Check communications protocol.
Reader not
1. Proper trigger levels not
enabled.
1. Ensure that the trigger pulse and the trigger
polarity settings are correct.
entering read
cycle in triggered
2. Trigger circuit not
correctly wired.
2. Ensure that the trigger circuit wiring meets the
reader requirements.
mode (trigger not
working)
3. Object detector
inoperative.
3. Check detector range and sensitivity. Try a
detector that is known to be good.
“Bad bar code”
message 1. Poor bar code quality or
incorrect label position.
1. Reposition label or test with a label that is
known to be good.
“No bar code”
message 1. No label is present. 1. Scan an object with a bar code on it.
“No object”
message 1. No object is present. 1. Scan an object with a bar code on it.
If you have any questions about the AtomScan + Bar Code Reader,
please consult this manual first. If you can’t find the answer, contact
Rockwell Automation International Support:
Rockwell International
Technical Support
6680 Beta Drive
Mayfield Village, Ohio 36849
Inside USA and Canada, call 1–800–289–2279.
Outside USA and Canada, contact your Allen-Bradley office or call
USA (216) 646–6800.
Technical Support Services