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

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CHAPTER 2: OVERVIEW OF PROGRAMMING Float calculation: (-1) Sign x [1 + Significand/2 23 ] x 2 (Exponent-127) Example for Opto 22 memory map At this address: base address base address + 1 base address + 2 base address + 3 This hex data: 41 77 33 33 In binary: 0 100 0001 0 111 0111 0011 0011 0011 0011 In these bits: 31 30 . . . 23 22 . . . 0 Equals (in decimal): 0 130 7,811,891 Representing: Sign Exponent Significand Decimal = (-1) 0 x [1 + 7,811,891/2 23 ] x 2 (130-127) = 1 x [1.931] x 8 = 15.45 (rounded to 2 decimal places) Two-Channel Analog Modules Remember that the memory map is set up for four points per module. If the SNAP analog modules you are using have only two channels, the addresses for the upper two points in each module will not contain data. For example, to read all bank analog point values in scaled units, you would read 256 bytes starting at address FFFFF0600000. Here’s how data for two-channel modules in positions 0 and 1 would appear: Beginning Address Ending Address Module Point Data Format FFFF F060 0000 FFFF F060 0003 0 four bytes—IEEE float FFFF F060 0004 FFFF F060 0008 FFFF F060 0007 FFFF F060 000B 0 1 2 four bytes—IEEE float (no data) FFFF F060 000C FFFF F060 000F 3 (no data) FFFF F060 0010 FFFF F060 0013 4 four bytes—IEEE float FFFF F060 0014 FFFF F060 0018 FFFF F060 0017 FFFF F060 001B 1 5 6 four bytes—IEEE float (no data) FFFF F060 001C FFFF F060 001F 7 (no data) 44 SNAP Ethernet-Based I/O Units Protocols and Programming Guide
CHAPTER 3 Chapter 3 Using the SNAP Ethernet I/O Driver Toolkit Introduction This chapter includes instructions for using the SNAP Ethernet I/O Driver Toolkit for communication between a computer and an Opto 22 SNAP Ethernet-based brain. The Toolkit includes two ActiveX components and two C++ classes. The components and classes have nearly identical programming interfaces and are used in the same manner. They hide the details of Ethernet communications and the IEEE 1394-based memory map protocol, making it easy to communicate with the Ethernet-based brain. This chapter assumes that you already have an understanding of ActiveX and C++ programming. The toolkit’s two components and two classes communicate differently with SNAP Ethernet-based brains: OptoSnapIoMemMap component or class—Communicates with the Ethernet-based brain’s memory map via TCP or UDP. You can use it to read and write to analog and digital points, configuration settings, and other sections of the memory map. OptoSnapIoStreaming component or class—Listens to and processes stream packets received from multiple Ethernet-based brains, hiding the details of receiving and processing UDP streaming packets. The C++ classes handle all the details of Ethernet sockets and the IEEE 1394-based protocol. They provide functions like OptoEnet(), GetDigPtState(), and SetAnaPtValue(), making programming easier and more intuitive.The ActiveX components are essentially wrappers around the C++ classes, making the efficient C++ code available to many types of ActiveX clients (see “Important ActiveX Client Issues” on page 47). The diagram at right shows how layers are related. The toolkit includes all the code for the C++ classes, ActiveX components, and examples. You are free to use this code at no charge in your own application, with or without modification. However, Opto 22 cannot support modification of the code. Your Application Toolkit ActiveX Components Toolkit C++ Classes 1394-based Protocol Sockets TCP and UDP IP Ethernet-based Brain NOTE: Because the SNAP Ethernet I/O Driver Toolkit was originally developed for SNAP Ethernet I/O, it contains some methods and structures that do not apply to SNAP Simple I/O or to some SNAP Ethernet-Based I/O Units Protocols and Programming Guide 45
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SNAP ETHERNET-BASED I/O UNITS PROTO
Page 3 and 4: Table of Contents Chapter 1: Introd
Page 5 and 6: Non-velocity Algorithms............
Page 7 and 8: Disconnecting......................
Page 9 and 10: Data Logging Configuration—Read/W
Page 11 and 12: Chapter 1 Introduction CHAPTER 1 We
Page 13 and 14: About this Guide CHAPTER 1: INTRODU
Page 15 and 16: For Help CHAPTER 1: INTRODUCTION If
Page 17 and 18: FEATURE CHAPTER 1: INTRODUCTION Ema
Page 19 and 20: CHAPTER 1: INTRODUCTION This task C
Page 21 and 22: CHAPTER 2 Chapter 2 Overview of Pro
Page 23 and 24: Referencing SNAP I/O Points CHAPTER
Page 25 and 26: Analog and Digital Systems (N Brain
Page 27 and 28: Digital-Only Systems The following
Page 29 and 30: I/O Point Types CHAPTER 2: OVERVIEW
Page 31 and 32: CHAPTER 2: OVERVIEW OF PROGRAMMING
Page 33 and 34: Watchdog (Digital and Analog Points
Page 45 and 46: Streaming Data CHAPTER 2: OVERVIEW
Page 47 and 48: Logging Data Area Number of Bytes I
Page 49 and 50: Using PID Loops What is a PID? CHAP
Page 51 and 52: Equations Common to All Algorithms
Page 53: CHAPTER 2: OVERVIEW OF PROGRAMMING
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 and 102: Scaling CHAPTER 4: USING THE IEEE 1
Page 103 and 104: Read and Write Packet Structure Par
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CHAPTER 4: USING THE IEEE 1394-BASE
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CHAPTER 4: USING THE IEEE 1394-BASE
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CHAPTER 5 Chapter 5 Advanced Modbus
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CHAPTER 5: ADVANCED MODBUS PROGRAMM
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APPENDIX A Appendix A SNAP Ethernet
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Status Area Read—Read Only This i
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Date and Time Configuration—Read/
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Security Configuration—Read/Write
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Serial Module Configuration—Read/
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Wiegand Serial Module Configuration
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SNMP Configuration—Read/Write (Do
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Starting Address Length Type Descri
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Digital Point Read—Read Only NOTE
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Analog Point Read—Read Only See
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Analog and Digital Point Configurat
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Digital Events and Reactions—Read
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Analog Point Calculation and Set—
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Analog Read and Clear/Restart—Rea
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Serial Event Configuration—Read/W
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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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