ALLEN BRADLEY 1747-L551 PLC Processor

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10–28 Troubleshooting Troubleshooting Your Output Modules The following will assist you in troubleshooting your output modules. Output Circuit Operation An output circuit controls the output signal in the following manner: 1. Logic circuits determine the output status. 2. An output LED indicates the status of the output signal. 3. Opto-electrical isolation separates output circuit logic and backplane circuits from field signals. 4. The output driver turns the corresponding output on or off. Backplane Logic Circuits Opto- Electrical Isolation Logic Circuits Output Drivers Output LED Publication <strong>1747</strong>-6.2
Troubleshooting 10–29 Troubleshooting Your Output Modules If your Output Circuit LED is And Your Output Device is And Probable Cause Recommended Action Check for duplicate outputs and addresses using the search function. On On/Energized Your program indicates that the output circuit is off or the output circuit cuit will not turn off. Programming problem. Output is forced on in program. Output circuit is damaged. If using subroutines, outputs are left in their last state when not executing subroutines. Use the force function to force output off. If this does not force the output off, output circuit is damaged. If the output does force off, then check again for logic/programming problem. Check processor FORCED I/O or FORCE LED and remove forces. Use the force function to force the output off. If this forces the output off, then there is a logic/programming problem. If this does not force the output off, the output circuit is damaged. Try other output circuit. Replace module. Off/De-energized Low or no voltage across the load. Your output device Measure the source voltage and check specifications. will not turn on and Incorrect wiring or open circuit. Check wiring and COMmon connections. the program indicatesicat that it is on. Output device is incompatible. Check specifications and sink/source compatibility (if DC output). Output circuit is damaged. Check wiring. Try other output circuit. Replace module. Output device is incompatible. Check specifications. On/Energized n Your output device will not turn off and the program indicates that it is off. Output circuit Off-state leakage current may exceed output device specification. Incorrect wiring. Output device is shorted or damaged. Check specifications. Use load resistor to bleed off leakage current. See output specifications. Check wiring. Disconnect from SLC and verify device operation. Verify device operation. Replace device. Output circuit is damaged. Check wiring. Try other output circuit. Replace module. Off Off/De-energized Your program indicates that the output circuit is on or the output circuit will Programming problem. Check for duplicate outputs and addresses using search function. If using subroutines, outputs are left in their last state when not executing subroutines. Use the force function to force output on. If this does not force the output on, output circuit is damaged. If the output does force on, then check again for logic/programming problem. not turn on. Output is forced off in program. Check processor FORCED I/O or FORCE LED and remove forces. Output circuit is damaged. Use the force function to force the output on. If this forces the output on, then there is a logic/programming problem. If this does not force the output on, the output circuit is damaged. Try other output circuit. Replace module. Publication <strong>1747</strong>-6.2
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Allen-Bradley SLC 500 Modular Hardw
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The information below summarizes th
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iv Table of Contents DH-485 Interfa
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vi Table of Contents Recommendation
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viii Table of Contents Connecting t
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x Table of Contents Calculating Hea
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P-2 Preface How to Use this Manual
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P-4 Preface Conventions Used in thi
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1-2 Quick Start for Experienced Use
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2-2 Selecting Your Hardware Compone
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2-10 Selecting Your Hardware Compon
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3-2 System Installation Recommendat
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3-10 System Installation Recommenda
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3-12 System Installation Recommenda
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4-2 Mounting Your SLC 500 Control S
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5-2 Identifying the Components of Y
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5-10 Identifying the Components of
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6-2 Installing Your Hardware Compon
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6-10 Installing Your Hardware Compo
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7-2 Wiring Your I/O Modules Contact
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7-4 Wiring Your I/O Modules Prepari
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7-6 Wiring Your I/O Modules Feature
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Page 105 and 106: 7-10 Wiring Your I/O Modules Using
Page 107 and 108: This chapter describes how to start
Page 109 and 110: Starting Up Your Control System 8-3
Page 119 and 120: This chapter covers the following m
Page 121 and 122: Maintaining Your Control System 9-3
Page 127 and 128: In this chapter, you will learn abo
Page 129 and 130: Troubleshooting 10-3 Replacing Fuse
Page 131 and 132: Troubleshooting 10-5 If the LEDs in
Page 133 and 134: Troubleshooting 10-7 If the LEDs in
Page 135 and 136: Troubleshooting 10-9 Identifying SL
Page 137 and 138: Troubleshooting 10-11 Troubleshooti
Page 139 and 140: Troubleshooting 10-13 If the LEDs i
Page 143 and 144: Troubleshooting 10-17 Identifying S
Page 145 and 146: Troubleshooting 10-19 If the RS232
Page 147 and 148: Troubleshooting 10-21 Identifying P
Page 151 and 152: Troubleshooting 10-25 Returning the
Page 153: Troubleshooting 10-27 Troubleshooti
Page 157 and 158: 11-2 Replacement Parts Catalog Numb
Page 159 and 160: The information in this appendix wi
Page 161 and 162: Setting Up the DH-485 Network A-3 O
Page 163 and 164: Setting Up the DH-485 Network A-5 E
Page 165 and 166: Setting Up the DH-485 Network A-7 I
Page 167 and 168: Setting Up the DH-485 Network A-9 T
Page 169 and 170: Setting Up the DH-485 Network A-11
Page 175 and 176: This appendix provides an overview
Page 177 and 178: RS-232 Communication Interface B-3
Page 195 and 196: This appendix provides an overview
Page 197 and 198: Setting Up the DH+ Network C-3 Wiri
Page 199 and 200: This appendix provides a brief intr
Page 201 and 202: Control Networks D-3 DeviceNet Netw
Page 203 and 204: - Use this Table to Calculate the
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Power Supply Worksheet E-3 Hardware
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This appendix will assist you in ca
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Calculating Heat Dissipation for th
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This appendix: • describes SLC 5/
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Communicating with Devices on an Et
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You can find the following terms us
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Glossary GL-3 Initiator — A node
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Glossary GL-5 Signal Delay — For
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I-2 Index hardware features, 5-2, 6
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I-4 Index DH-485 Communication Inte
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I-6 Index keyswitch positions for t
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I-8 Index Publication 1747-6.2 Q Qu
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I-10 Index T testing inputs, 8-5 ou
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ALLEN BRADLEY 1747-L551 PLC Processor

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