Allen-Bradley 2755 User Manual Page 67
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Troubleshooting and Maintenance 6–2
Table 6.A
Troubleshooting Chart
Problem
Probable Cause(s) Corrective Action(s)
Reader does not power up. No LED indicators
illuminate.
1. Improper connection to power source.
2. Power source not providing 12 to 28
VDC.
1. Check power source.
2. Check for green LED in wiring base.
3. Check the wiring base connector for bent
pins.
No communications with personal computer. 1. Communications fault.
2. No power supply connection at
DeviceNet connector
3. Computer fault.
4. Broken or bent pins on Configuration Port
of Reader
1. Check cable connection.
2. Power must be supplied. See Chapter 3.
3. Refer to computer user manual.
4. Check Configuration Port of Reader for
damaged pins. If pins are damaged, re-
turn Reader.
No laser beam emits from scan window.
1. No laser light trigger signal.
1. Verify Reader Laser Light trigger source
for proper configuration and operation.
Unable to read a label. 1. A label has not been defined.
2. Decoding functions not configured
correctly.
3. Label(s) out of specification.
4. Scan line not on the label.
5. Reader is at incorrect angle or distance
from bar code symbols.
1. Define a label and symbol.
2. Check decoder configuration to verify that
parameters are set appropriately for your
application. After making changes, SEND
the configuration and try again.
3. Use good quality labels that are within
specifications.
4. Reposition the scan line.
5. Use autofocus to adjust the read range.
Use the ON SYMBOL LED to verify that
the Reader is scanning a possible bar
code symbol.
No communications with host. 1. Baud rates not set properly.
2. Loose or incorrect wiring.
3. Broken or bent pins on 24-pin Reader
connector.
4. Reader DeviceNet address or DH485
node and maximum node are not set
properly.
5. Termination switch not set properly.
1. Verify that Reader and host are set at the
same Baud rate.
2. Verify cable connections using connection
diagrams in Chapter 3.
3. Check Reader connector for broken or
bent pins.
4. Verify DeviceNet Address or DH485 node
number settings.
5. Check position of termination switch in
wiring base. Set to correct position.
No communications with network. 1. Communications fault.
2. Loose or incorrect wiring.
3. Broken or bent pins on 24-pin Reader
connector.
4. Reader DeviceNet address or DH485
node and maximum node are not set
properly.
5. Termination switch not set properly.
1. Check status of NETWORK LED, refer to
section “LED Indicators”.
2. Verify cable connections using connection
diagrams in Chapter 3.
3. Check Reader connector for broken or
bent pins.
4. Verify DeviceNet Address or DH485 node
number settings.
5. Check position of termination switch in
wiring base. Set to correct position.
Trou
b
leshoot
i
ng
Chart
- AdaptaScan 1
- Bar Code 1
- Allen-Bradley 1
- Important User Information 2
- Installing the Wiring Base 4
- Chapter 4 5
- Chapter 5 5
- Chapter 6 5
- Specifications 6
- DIN Rail Mount 6
- Terminal Blocks 6
- European Union Directive 6
- Compliance 6
- Using this Manual 7
- 9
- Typical System 10
- Scan Window 11
- Configuration Port Connector 11
- Typical Applications 13
- Overview 1–6 14
- Controller 14
- Overview 1–7 15
- Scanning Modes 16
- Wiring Base 17
- Communication Options 19
- RS-422 / RS-485 20
- Protocols 21
- (Catalog No. 2755-ASN) 22
- Scanning Parameters 23
- Focus Options 23
- • Manual 23
- • Preset 23
- • AutoFocus 23
- Decoding Operations 24
- System Monitoring 24
- Online Adjustments 24
- Safety Labels 25
- Ordering Information 26
- Installation Considerations 27
- Scan Beam 29
- Scan Angle = 72 30
- 58 = Default 30
- Scan Angle = 50 31
- 40 = Default 31
- Scan Angle = 30 31
- 24 = Default 31
- Apparent 32
- Reader Adjustments 33
- Read Ranges 34
- Calculating 35
- Scans per Label 35
- Dimensions 37
- Reader / Base Assembly 38
- Mounting the 39
- Bottom Mounting 40
- Wiring Base Dust Cover 40
- Conduit and Cable 41
- Connections 41
- Hole Plugs 42
- Mounting Bracket 43
- Top Post Mounting 44
- Side Post Mounting 45
- Installing the Safety Wire 46
- Ground Screw 49
- Line Termination 51
- Output Module Application 55
- Input Module Application 56
- Detector 57
- Installing / Removing the 59
- Power-up Sequence 60
- Checking Reader 60
- Operation 60
- Replacing a Reader 61
- Downloading Configurations 62
- Downloading Firmware 64
- Downloading 65
- Troubleshooting and 66
- Maintenance 66
- On Symbol 68
- Trigger/Read 68
- I/O 1 and I/O 2 68
- Laser On 69
- Appendix 73
- Output Modules 74
- Input Modules 74
- Certifications 75
- Glossary 79
- GlossaryG–2 80
- Glossary G–3 81
- GlossaryG–4 82
- Glossary G–5 83
- GlossaryG–6 84
- Glossary G–7 85
- GlossaryG–8 86
- Glossary G–9 87
- GlossaryG–10 88
- Glossary G–11 89
- X dimension 90
- IndexIndex 91
- IndexI–2 92
- Index I–3 93
- 0 0 0 1 2 3 4 5 6 7 8 9 0 5 95
- 9 00 38200 11413 8 95
- Worldwide representation 96
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