snap ethernet-based i/o units protocols and programming guide

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CHAPTER 4: USING THE IEEE 1394-BASED PROTOCOL If you want to save the response data—or if you want to calculate offset and gain by hand—you can write this data to the memory map area “Analog and Digital Point Configuration Information—Read/Write” on page 125. Configuring I/O Points, Event/Reactions, and Security See Chapter 2 for important information on configuring I/O points, I/O point features, event/reactions, and other system functions. Reading Module Types Analog/digital/serial brains can recognize analog and serial modules on the rack and report what they are. All SNAP Ethernet-based brains report digital modules and empty slots the same, however. To read a module type, use the “Analog and Digital Point Configuration Information—Read/Write” area of the memory map. (See page 125.) Module type values are shown in the table on page 18. Configuring I/O Point Types Although analog/digital/serial brains recognizes module types for analog modules, they do not recognize digital modules or individual analog point values. If the actual module type or point values differ from the defaults, you must assign the correct values by writing to the “Analog and Digital Point Configuration Information—Read/Write” area of the memory map. (See page 125.) Point type values are shown in the table starting on page 19. Configuring I/O Point Features For counters and quadrature counters, you must also configure the I/O point feature. See page 88. 92 SNAP Ethernet-Based I/O Units Protocols and Programming Guide
Read and Write Packet Structure Parameters CHAPTER 4: USING THE IEEE 1394-BASED PROTOCOL The following table defines the parameters for all requests and responses: Parameter Full Name Description destination_id Destination identifier Not used by the SNAP Ethernet-based brain. Set this parameter to zero. tl Transaction label A label specified by the requester and identifying this transaction. This value is returned in the response packet. rt Retry code Not used by the SNAP Ethernet-based brain. Set this parameter to zero. tcode Transaction code Defines the type of packet: Write Quadlet Request = 0 Write Block Request = 1 Write Quadlet or Block Response = 2 Read Quadlet Request = 4 Read Block Request = 5 Read Quadlet Response = 6 Read Block Response = 7 pri Priority Not used by the SNAP Ethernet-based brain. Set this parameter to zero. source_id Source identifier Optional parameter. If you are running two or more applications simultaneously, you can give each application a different ID in this parameter. If an error occurs, you can read the Source address in the memory map Status area to find out which application caused the error. See page 105. rcode Response code Indicates whether the command was successful. Successful command (ACK) = 0 Unsuccessful command (NAK) = any number except zero. If you receive a NAK in this parameter, see “Error Codes” on page 98. destination_offset Destination offset Specifies the address location in the target node. data_length Data length Specifies the amount of data being sent in the data parameter of this packet. Maximum size is 2034 bytes for data sent via TCP, or 1480 bytes for data sent via UDP. extended_tcode Extended transaction code Not used by the SNAP Ethernet-based brain. Set this parameter to zero. SNAP Ethernet-Based I/O Units Protocols and Programming Guide 93
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SNAP ETHERNET-BASED I/O UNITS PROTO
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Table of Contents Chapter 1: Introd
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Non-velocity Algorithms............
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Disconnecting......................
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Data Logging Configuration—Read/W
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Chapter 1 Introduction CHAPTER 1 We
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About this Guide CHAPTER 1: INTRODU
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For Help CHAPTER 1: INTRODUCTION If
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FEATURE CHAPTER 1: INTRODUCTION Ema
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CHAPTER 1: INTRODUCTION This task C
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CHAPTER 2 Chapter 2 Overview of Pro
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Referencing SNAP I/O Points CHAPTER
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Analog and Digital Systems (N Brain
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Digital-Only Systems The following
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I/O Point Types CHAPTER 2: OVERVIEW
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CHAPTER 2: OVERVIEW OF PROGRAMMING
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Watchdog (Digital and Analog Points
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Streaming Data CHAPTER 2: OVERVIEW
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Logging Data Area Number of Bytes I
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Using PID Loops What is a PID? CHAP
Page 51 and 52: Equations Common to All Algorithms
Page 53 and 54: CHAPTER 2: OVERVIEW OF PROGRAMMING
Page 55 and 56: CHAPTER 3 Chapter 3 Using the SNAP
Page 57 and 58: CHAPTER 3: USING THE SNAP ETHERNET
Page 63 and 64: Environment Visual Basic 6 Internet
Page 65 and 66: MemMap Example Code CHAPTER 3: USIN
Page 71 and 72: Return Values CHAPTER 3: USING THE
Page 73 and 74: IsOpenDone V Close V Return Values
Page 75 and 76: Digital Point Methods CHAPTER 3: US
Page 77 and 78: SetDigBankOnMask V [in] long nPts63
Page 79 and 80: Analog Bank Methods CHAPTER 3: USIN
Page 81 and 82: GetStatusWatchdogTime [out] long pn
Page 87 and 88: GetLastStreamStandardBlock (ActiveX
Page 89 and 90: CHAPTER 4 Chapter 4 Using the IEEE
Page 91 and 92: CHAPTER 4: USING THE IEEE 1394-BASE
Page 93 and 94: Bytes 0-3 Bytes 4-7 Bytes 8-11 Byte
Page 95 and 96: Bytes 0-3 Bytes 4-7 Bytes 8-11 The
Page 97 and 98: Bytes 0-3 Bytes 4-7 Bytes 8-11 Byte
Page 99 and 100: Read and clear latches for individu
Page 101: Scaling CHAPTER 4: USING THE IEEE 1
Page 109 and 110: CHAPTER 5 Chapter 5 Advanced Modbus
Page 111 and 112: CHAPTER 5: ADVANCED MODBUS PROGRAMM
Page 113 and 114: APPENDIX A Appendix A SNAP Ethernet
Page 115 and 116: Status Area Read—Read Only This i
Page 117 and 118: Date and Time Configuration—Read/
Page 119 and 120: Security Configuration—Read/Write
Page 121 and 122: Serial Module Configuration—Read/
Page 123 and 124: Wiegand Serial Module Configuration
Page 125 and 126: SNMP Configuration—Read/Write (Do
Page 127 and 128: Starting Address Length Type Descri
Page 131 and 132: Digital Point Read—Read Only NOTE
Page 133 and 134: Analog Point Read—Read Only See
Page 135 and 136: Analog and Digital Point Configurat
Page 137 and 138: Digital Events and Reactions—Read
Page 141 and 142: Analog Point Calculation and Set—
Page 143 and 144: Analog Read and Clear/Restart—Rea
Page 149 and 150: Serial Event Configuration—Read/W
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Starting Address Length Type Descri
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Starting Address Length Type Descri
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Data Log—Read/Write (Does not app
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Appendix B Table of Offsets Introdu
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Module Point (Decimal) Point (Hex)
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Index A access, setting up SNMP sec
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error codes IEEE 1394-based protoco
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O off-latch, 20 offset, 24 IEEE 139
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