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

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CHAPTER 1: INTRODUCTION 2 SNAP Ethernet-Based I/O Units Protocols and Programming Guide SNAP Ethernet I/O offers rich analog, digital, and serial features, including high-speed counting (20 kHz), quadrature counters, events and reactions, PID loops, thermocouple linearization, output clamping, and much more. Racks hold 4, 8, 12, or 16 modules. For control, use SNAP Ethernet I/O units with one of Opto 22’s industrial controllers or with SNAP Ultimate I/O. All models can use a wired network or modem over point-to-point protocol (PPP); a wireless LAN (802.11 FH) model is also available. SNAP Ultimate I/O combines the rich feature set in SNAP Ethernet I/O with the ability to run flowchart-based control strategies on the I/O unit itself. You develop these strategies with full-featured, easy-to-use ioControl software, which comes free with any SNAP Ultimate brain. SNAP Ultimate I/O can also control other Ethernet-based I/O units for an extended system. All models run on a wired network or modem over PPP; a cellular wireless model is also available. For a detailed comparison of models and features, see comparison charts starting on page 6. Software All Ethernet-based I/O units come with free ioManager utility software for assigning IP addresses, configuring points and features, maintaining units, and doing realtime reads and writes. ioManager software and its user’s guide are included on the CD that came with the brain. SNAP Ultimate I/O comes with free ioControl software for developing flowchart-based control strategies. ioControl software, user’s guide, and command reference are included on the CD that came with the SNAP Ultimate brain. Fully integrated with ioControl is ioDisplay , a full-featured HMI with alarming, trending, and a built-in library of industrial automation graphics. ioDisplay is available for separate purchase. If you are already using Modbus ® /TCP, you do not need additional software. The Modbus/TCP memory map and instructions for use are included in Opto 22 form #1460, the SNAP Ethernet-Based I/O Units User’s Guide, which is available on the CD that came with the brain. Additional information is in Chapter 5. For those using OPC, Opto 22’s OptoOPCServer is a nimble OPC 2.0-compliant server available for purchase. If you need to write your own custom applications in Visual Basic ® or C++ ® , our SNAP Ethernet I/O Driver Toolkit with ActiveX components and C++ classes is included on the CD that came with the brain. For instructions, see Chapter 3.
About this Guide CHAPTER 1: INTRODUCTION If you are programming for Linux ® or another operating system other than Microsoft ® Windows ® , the IEEE 1394-based protocol for communicating with Ethernet-based I/O units is open and documented in Chapter 4. SNAP Ethernet I/O units can also be used with Opto 22 FactoryFloor ® software running on a SNAP-LCM4 controller. (SNAP Ultimate I/O and SNAP Simple I/O units are not compatible with FactoryFloor; they use ioControl and ioDisplay.) This guide provides information you need if you are configuring and communicating with your SNAP Ethernet-based I/O unit using the SNAP Ethernet I/O Driver Toolkit or the IEEE 1394-based protocol. If you are not doing one of these things, but are using flowcharts developed in ioControl as your method of communicating with these I/O units, you do not need this guide. See “Understanding Communication with the I/O Unit” on page 8. This guide assumes that you are already familiar with programming in the format you’ve chosen to use. It also assumes that you have already installed the SNAP Ethernet-based I/O unit. (If you have not, see Opto 22 form #1460, the SNAP Ethernet-Based I/O Units User’s Guide, for instructions.) The following sections are included in this user’s guide: Chapter 1, “Introduction”—information about the guide and how to reach Opto 22 Product Support. Chapter 2, “Overview of Programming”—basic information you need for programming applications to communicate with SNAP Ethernet-based I/O units. Chapter 3, “Using the SNAP Ethernet I/O Driver Toolkit”—programming your own applications the easy way, using our ActiveX components or C++ classes to hide the details of the memory map and the IEEE 1394-based protocol. Chapter 4, “Using the IEEE 1394-based Protocol”—programming your own applications for SNAP Ethernet-based I/O units using Opto 22’s IEEE 1394-based memory map protocol. Includes examples. Chapter 5, “Advanced Modbus Programming”—Using Modbus/TCP to access areas of the I/O unit’s memory map that are not included in the Modbus memory map. Appendix A, “SNAP Ethernet-Based Brain Memory Map”— the complete memory map for all SNAP Ethernet-based I/O units. Appendix B, “Table of Offsets”—an easy way to find memory map addresses for specific points on Ethernet-based I/O units. SNAP Ethernet-Based I/O Units Protocols and Programming Guide 3
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Environment Visual Basic 6 Internet
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MemMap Example Code CHAPTER 3: USIN
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CHAPTER 3: USING THE SNAP ETHERNET
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Return Values CHAPTER 3: USING THE
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CHAPTER 4 Chapter 4 Using the IEEE
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CHAPTER 4: USING THE IEEE 1394-BASE
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Bytes 0-3 Bytes 4-7 Bytes 8-11 Byte
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Bytes 0-3 Bytes 4-7 Bytes 8-11 The
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Bytes 0-3 Bytes 4-7 Bytes 8-11 Byte
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Read and clear latches for individu
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Scaling CHAPTER 4: USING THE IEEE 1
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Read and Write Packet Structure Par
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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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