1747-6.22, Backup Scanner User Manual

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8-162 Switchover Considerations Remote I/O Switching The communications protocol for the remote I/O link is a masterslave half-duplex type. This means that the master station (processor) sends a command message addressed to a slave (remote I/O adapter), and the slave responds with a reply message addressed to the master. This is also called two-way alternating communication. Publication 1747-6.22 When the communication channel is configured as RIO, the primary 1747-BSN emulates a Series B 1747-SN module with all the features that it provides to the user. Additionally, the secondary 1747-BSN “spies” on the RIO link to acquire all the input data and use it to emulate the 1747-SN functionality to the secondary SLC 5/0x. In the secondary system, the 1747-BSN simulates the entire scanner operation to the secondary SLC 5/04 with the following characteristics: • Real discrete input data is acquired by the secondary BSN from the RIO network and transferred to the secondary SLC 5/04 through the input (I) file. • Real BTR input data is acquired by the secondary BSN from the RIO network and transferred to the secondary SLC 5/04 through the M1 file. All the timing necessary for doing a BTR command in the SLC 5/04 is simulated by the secondary BSN. • The discrete output data sent by the secondary SLC 5/04 through the output (O) file is stored in the output image table for using in case of a switchover. • The BTW output data sent by the secondary SLC 5/04 through the M0 file is stored into the secondary BSN and all the timing for the BTW operation is simulated by the secondary BSN. • In case of RIO communication errors seen by the BSN in the primary system (remote rack errors, BTR or BTW errors, etc.), the secondary BSN simulates the same errors for the secondary SLC 5/04. This simulation is done in order to assure that the secondary SLC 5/04 knows the real status of the remote devices. • If a switchover occurs, all the input and output data inside the BSN is ready for the operation as the new primary scanner. When the backup system is operating properly, the relays of the primary 1747-BSN are closed and the relays of the secondary 1747-BSN are open. Should a failure occur in the primary system, the relays of the primary 1747-BSN module open and the relays in the secondary 1747-BSN module close. Important: The smart-switch interface communicates with the secondary processor only when the 1747-BSN module belongs to the secondary system. When the module is primary, the smart switch only monitors the remote I/O link to obtain input/output data.
Switchover Considerations 8-163 The smart switch interface also includes a carrier-detect circuit to monitor the activity of the remote I/O link. The purpose of this circuit is to detect an idle remote I/O link before the secondary relays are closed. This guarantees that the former primary system was really disconnected from the link and the remote adapters have completed their response to the last poll from the primary scanner. In addition, in the event of an HSSL break, the carrier-detect circuit prevents the secondary system from taking control of the link along with the primary system. The figure below shows the block diagram of the remote I/O switch. HSSL link to primary 1747-BSN Remote I/O link 1747-BSN Copy of remote I/O data including block transfers Smart-switch interface Secondary processor I/O scanner/adaptor Carrier-defect circuit Publication 1747-6.22
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Backup Scanner 1747-BSN User Manual
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Overview Table of Contents Preface
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Scanner Configuration and Programmi
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Switchover Considerations Programmi
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Glossary Index Table of Contents xi
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Who Should Use This Manual How to U
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Conventions Used in This Manual The
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Overview This chapter contains the
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Local I/O Remote I/O Processor I/O
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SLC and Scanner Asynchronous Operat
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RIO Logical Rack 0 RIO Logical Rack
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Physical and Logical RIO Link Speci
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Overview 1-27 Complementary I/O: Pl
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Overview 1-29 Complementary I/O: Pl
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Slot Pair I O I O I O I O 0 1 2 3 4
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Hardware Features Overview 1-33 Not
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Module Address Switch Overview 1-35
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A Typical SLC 500 Backup Configurat
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Overview 1-39 Data table values are
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Required Tools and Equipment Chapte
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5. Configure the system. Quick Star
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Configuration Selection Installatio
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Backup Scanner Installation Install
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Installation and Wiring 3-49 Termin
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Chapter 4 Operating Your SLC 500 Ba
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(1) Operating Your SLC 500 Backup S
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Operating Your SLC 500 Backup Syste
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Startup Sequencing Operating Your S
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Understanding Remote Input and Outp
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Rules for Configuring the Scanner G
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Logical Rack 0 Logical Rack 1 Logic
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Considerations When Configuring Rem
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Output Reset Control Device Inhibit
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M0 File - RIO Device Reset Control
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M1 Status File Description General
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Logical Device Starting Address Sta
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Logical Device Fault Status M1 (Sta
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Primary Logical Device Address, Wor
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SLC/Scanner Configuration Scanner C
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Chapter 6 Module Control and Status
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Module Control and Status Word 6-91
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Transferring Data over the High-Spe
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Data Transfer Status Word Module Co
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Program File 2 0000 0001 0002 Modul
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Program File 4 0000 0001 0002 0003
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Module Status Counters Module Contr
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RIO Block Transfer Theory of Operat
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SLC Processor ➀ RIO Block Transfe
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RIO Block Transfer General Function
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Example 2 # 2 # 4 # 1 # 2 # 3 # 4 #
Page 109 and 110: M0 File BT Control Buffer Layout BT
Page 111 and 112: Error Code Description RIO Block Tr
Page 113 and 114: RIO Block Transfer 7-115 Your SLC c
Page 115 and 116: Control EN TO Status Flag EW ST ER
Page 117 and 118: Control Flag EN TO Status Flag EW S
Page 119 and 120: Bit Number Octal 17 10 7 Bit Number
Page 121 and 122: Block Transfer Read Control Logic E
Page 123 and 124: RIO Block Transfer 7-125 Rung 2:3 W
Page 125 and 126: RIO Block Transfer 7-127 Rung 2:1 C
Page 127 and 128: Directional Continuous Block Transf
Page 131 and 132: Directional Repeating Block Transfe
Page 133 and 134: Rung 2:5 Block transfer reads will
Page 137 and 138: Bidirectional Continuous Block Tran
Page 139 and 140: RIO Block Transfer 7-141 When a BTR
Page 141 and 142: RIO Block Transfer 7-143 Rung 2:9 T
Page 143 and 144: RIO Block Transfer 7-145 Rung 2:1 C
Page 147 and 148: RIO Block Transfer 7-149 Rung 2:10
Page 149 and 150: RIO Block Transfer 7-151 Rung 2:2 U
Page 153 and 154: RIO Block Transfer 7-155 Rung 2:11
Page 155 and 156: Switchover Considerations Chapter 8
Page 157 and 158: Switchover Considerations 8-159 Div
Page 159: Switchover Considerations 8-161 Dur
Page 163 and 164: Programming Techniques Chapter 9 Ch
Page 165 and 166: Program File 3 0000 0001 0002 0003
Page 167 and 168: 0009 0010 0011 0012 Programming Tec
Page 169 and 170: 0017 Programming Techniques 9-171 T
Page 171 and 172: 0005 0006 0007 0008 0009 0010 0011
Page 173 and 174: 0021 0022 0023 0024 0025 0026 0027
Page 175 and 176: Programming Techniques 9-177 Data T
Page 177 and 178: Programming Techniques 9-179 3. For
Page 179 and 180: Programming Techniques 9-181 The ha
Page 181 and 182: Programming Techniques 9-183 Howeve
Page 183 and 184: Backup Scanner Operating Specificat
Page 185 and 186: Calculating Throughput Specificatio
Page 187 and 188: Specifications A-189 You need to ca
Page 189 and 190: Determining T btx All Baud Rates 57
Page 191 and 192: Specifications A-193 3. Calculate t
Page 193 and 194: Backup Scanner Output Delay Time (T
Page 195 and 196: M0-M1 Files and G Files Appendix B
Page 197 and 198: Monitoring Bit Addresses M0-M1 File
Page 199 and 200: Access Time M0-M1 Files and G Files
Page 201 and 202: S:4/8 causes the #M1:4.3 file to up
Page 203 and 204: M0-M1 Files and G Files B-205 G Fil
Page 205 and 206: M0-M1 Files and G Files B-207 With
Page 207 and 208: RIO Configuration Worksheet Appendi
Page 209 and 210: Glossary The following terms are us
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Glossary 213 Module Status Word (MS
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Numerics 1/2-slot addressing, 1-13,
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minimizing the scan time, B-6 speci
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Index I-ccxix Publication 1747-6.22
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Publication 1747-6.22 — October 1
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