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

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CHAPTER 1: INTRODUCTION The I/O Side of the Brain The SNAP Ultimate brain reads and writes to the I/O points on the rack using its I/O side memory map.You can think of the brain’s memory map as a grid of mailboxes, with each mailbox having its own memory address. Each mailbox address has a specific purpose. For example, one address holds the state of a single digital point; another address holds counter data for the same point. The complete list of memory map addresses is in Appendix A. If you are familiar with programmable logic controllers (PLCs), you’ll see that the memory map is similar to a register. On its I/O side, the Ultimate brain has the same features as a SNAP Ethernet brain. The Control Side of the Brain In the control side, the SNAP Ultimate brain can run an ioControl strategy, a flowchart-based control program you develop in ioControl. These flowcharts provide the logic that controls processes through the system. Commands within the flowchart read from and write to the memory map in the I/O side of the brain in order to monitor and control the I/O points. On its control side, the SNAP Ultimate brain has capabilities very much like a traditional Opto 22 controller. Using the Two Sides Many customers who use SNAP Ultimate I/O never need to think about the I/O side and its memory map. While the Ultimate brain has the same features on its I/O side as a SNAP Ethernet brain, most of these features are easier to use in an ioControl strategy running on the control side. If your only communication with the brain is through an ioControl strategy, you do not need to use this programming guide or the memory map at all. You should use ioManager to configure the system and ioControl for developing your monitoring and control strategy. The ioManager User’s Guide and the ioControl guides will provide the information you need. However, if you are using another method to communicate with the brain, either instead of or in addition to an ioControl strategy, you need the additional information provided in this programming guide. Remember that because the SNAP Ultimate I/O system is so versatile, you can use several methods at once to do several things. For example, the system might be running an ioControl strategy, providing data to a peer on the network, and communicating with a third-party HMI, all at once. Any time you are communicating with both the control side and the I/O side of the brain at once, plan carefully and use caution. The control side of the brain reads from and writes to the I/O side just as other methods do directly. Make sure that data being written directly to the I/O side does not conflict with control logic being executed in the ioControl strategy. 10 SNAP Ethernet-Based I/O Units Protocols and Programming Guide
CHAPTER 2 Chapter 2 Overview of Programming Introduction In general, writing programs to use SNAP Ethernet-based I/O units involves six steps. You can use either TCP or UDP as the protocol. The steps are: 1. Connect to the brain (TCP only; not required for UDP). 2. Send a powerup clear (PUC) to the brain. 3. Configure points and point features. 4. (Optional) Configure event/reactions, security, streaming, and other functions. 5. Read and write to points. 6. Disconnect from the brain (TCP only; not required for UDP). This step occurs only after all communication is finished. The connection is left open during normal communications. Details of these steps depend on the language or method you use for developing your custom application, but some basic information is common to all languages and methods. This chapter includes the following basic information you need in order to program for SNAP Ethernet-based I/O units: Understanding the brain’s memory map page 12 Referencing SNAP I/O points page 13 Configuring I/O points page 18 Using I/O point features page 20 Using event/reactions page 26 Streaming data from the brain to a host page 35 Data logging page 37 Using PID loops page 39 Formatting and interpreting data page 41 You can use ioManager to configure all points and functions (see the ioManager User’s Guide for instructions), or you can configure them in your program. SNAP Ethernet-Based I/O Units Protocols and Programming Guide 11
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Page 17 and 18: FEATURE CHAPTER 1: INTRODUCTION Ema
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Page 47 and 48: Logging Data Area Number of Bytes I
Page 49 and 50: Using PID Loops What is a PID? CHAP
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Page 63 and 64: Environment Visual Basic 6 Internet
Page 65 and 66: MemMap Example Code CHAPTER 3: USIN
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Return Values CHAPTER 3: USING THE
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IsOpenDone V Close V Return Values
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Digital Point Methods CHAPTER 3: US
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CHAPTER 3: USING THE SNAP ETHERNET
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CHAPTER 3: USING THE SNAP ETHERNET
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GetLastStreamStandardBlock (ActiveX
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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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