ALLEN BRADLEY 1747-L551 PLC Processor

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A–2 Setting Up the DH-485 Network DH-485 Token Rotation A node holding the token can send any valid packet onto the network. Each node is allowed only one transmission (plus two retries) each time it receives the token. After a node sends one message packet, it attempts to give the token to its successor by sending a “token pass” packet to its successor. If no network activity occurs, the initiator sends the token pass packet again. After two retries (a total of three tries) the initiator will attempt to find a new successor. Important: The maximum address that the initiator will search for before wrapping to zero is the value in the configurable parameter “maximum node address.” The default value for this parameter is 31 for all initiators and responders. The allowable range of the node address of an initiator is 0 to 31. The allowable address range for all responders is 1 to 31. There must be at least one initiator on the network. DH-485 Network Initialization Network initialization begins when a period of inactivity exceeding the time of a link dead timeout is detected by an initiator on the network. When the time for a link dead timeout is exceeded, usually the initiator with the lowest address claims the token. When an initiator has the token it will begin to build the network. The network requires at least one initiator to initialize it. Building a network begins when the initiator that claimed the token tries to pass the token to the successor node. If the attempt to pass the token fails, or if the initiator has no established successor (for example, when it powers up), it begins a linear search for a successor starting with the node above it in the addressing. When the initiator finds another active initiator, it passes the token to that node, which repeats the process until the token is passed all the way around the network to the first node. At this point, the network is in a state of normal operation. Devices that use the DH-485 Network Presently, the following SLC 500 devices support the DH-485 network: • SLC 500 Fixed I/O Controller (responder) • SLC 5/01 Modular I/O Controller (responder) • SLC 5/02 Modular I/O Controller (initiator/responder) • SLC 5/03 Modular I/O Controller (initiator/responder) • SLC 5/04 Modular I/O Controller (initiator/responder) • SLC 5/05 Modular I/O Controller (initiator/responder) • Personal computer running your programming software (initiator) • Hand-Held Terminal (initiator) • DTAM (initiator/responder) Publication 1747-6.2
Setting Up the DH-485 Network A–3 Other devices that use the DH-485 network include those in the table below. Catalog Number Description Installation Requirement 1746-BAS BASIC Module SLC Chassis Function Provides an interface for SLC 500 devices to foreign devices. Program in BASIC to interface the 3 channels (2 RS232 and 1 DH485) to printers, modems, or the DH-485 network for data collection. Publication 1746-6.1 1746-6.2 1746-6.3 1747-KE DH-485/DF1 Interface Module SLC Chassis Provides a non-isolated DH-485 interface for SLC 500 devices to host computers over RS-232 using full- or DF1 half-duplex protocol. Enables remote programming using your programming software to an SLC 500 processor or the DH-485 network through modems. Ideal for low cost RTU/SCADA applications. 1747-6.12 1770-KF3 DH-485/DF1 Interface Module Standalone (“desktop”) Provides an isolated DH-485 interface for SLC 500 devices to host computers over RS-232 using full- or DF1 half-duplex protocol. Enables remote programming using your programming software to an SLC 500 processor or the DH-485 network through modems. 1770-6.5.18 1784-KR PC DH-485 Interface Module IBM XT/AT Computer Bus Provides an isolated DH-485 port on the back of the computer. When used with your programming software, it improves communication speed and eliminates use of the Personal Interface Converter (1747-PIC). The Standard Driver allows you to write “C” programs for data acquisition applications. 1784-2.23 6001-6.5.5 1785-KA5 DH+/DH485 Gateway (1771) PLC Chassis 2760-RB Flexible Interface Module (1771) PLC Chassis Provides communication between stations on the PLC-5 (DH+) and SLC 500 (DH-485) networks. Enables communication and data transfer from PLC to SLC 500 on DH-485 network. Also enables programming software programming or data acquisition across DH+ to DH-485. Provides an interface for SLC 500 (using protocol cartridge 2760-SFC3) to other A-B PLCs and devices. Three configurable channels are available to interface with Bar Code, Vision, RF, Dataliner, and PLC systems. 1785-6.5.5 1785-1.21 2760-ND001 1784-KTX, -KTXD PC DH485 IM IBM XT/AT Computer Bus Provides DH485 or DH+ connection 1784-6.5.22 1784-PCMK PCMCIA IM PCMCIA slot in computer and Interchange Provides DH485 or DH+ connection 1784-6.5.19 2707-L8P1, -L8P2, -L40P1, -L40P2, -V40P1, -V40P2, -V40P2N, -M232P3, and -M485P3 DTAM Plus and DTAM Micro Operator Interfaces Panel Mount Provides electronic operator interface for SLC 500 processors. 2707-800, 2707-803 2711-K5A2, -B5A2, -K5A5, -B5A5, -K5A1, -B5A1, -K9A2, -T9A2, -K9A5, -T9A5, -K9A1, and -T9A1 PanelView 550 and PanelView 900 Operator Terminals Panel Mount Provides electronic operator interface for SLC 500 processors. 2711-802, 2711-816 Publication 1747-6.2
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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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7-8 Wiring Your I/O Modules Octal L
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7-10 Wiring Your I/O Modules Using
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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 157 and 158: 11-2 Replacement Parts Catalog Numb
Page 159: The information in this appendix wi
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
Page 205 and 206: Power Supply Worksheet E-3 Hardware
Page 207 and 208: This appendix will assist you in ca
Page 209 and 210: Calculating Heat Dissipation for th
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Calculating Heat Dissipation for th
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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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