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

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Streaming Data CHAPTER 4: USING THE IEEE 1394-BASED PROTOCOL Streaming is a fast way to get continuous information about I/O from the SNAP Ethernet-based brain. See page 35 for information on streaming and other methods to configure it. Streaming involves two steps: configuring parameters for streaming, and receiving streamed data. Configuring Parameters for Streaming To configure parameters for streaming, use a Write Block Request to the memory map area “Digital Bank Read—Read Only” on page 119. To FFFFF03FFFD4, write how often in milliseconds you want to receive the streamed data. To FFFFF03FFFD8, write the Ethernet port number that will receive data. To the Stream Target addresses, write the IP addresses of the hosts that should receive the data. To turn streaming on, write anything but a zero to the address FFFFF03FFFD0. To turn streaming off, write a zero to this address. Receiving Streamed Data As soon as you’ve configured parameters for streaming, the brain starts sending the data you requested. The brain sends data using a Write Block Request, with the data_block parameter containing data as shown in the memory map area “Streaming—Read Only” on page 134. Your program does not need to respond to this Write Block Request; it only needs to process the data block. Addresses will be zero-filled in areas that don’t apply. For example, addresses FFFFF1000000 through FFFFF10000FF show analog data for 64 points in Engineering Units. If some of the points are digital, addresses corresponding to them will be filled with zeros. See “Stream Packet Format” on page 36 for additional information. Using I/O Point Features General information on I/O point features is on page 20. This section provides specific information for the IEEE 1394-based protocol. Latches Latching is automatic and needs no configuration. Using the Opto 22 protocol, you can read the on-latch or off-latch state of any digital point. You can: Read latches for individual points and leave them set Read latches for a bank of digital points and leave them set 88 SNAP Ethernet-Based I/O Units Protocols and Programming Guide
Read and clear latches for individual points. CHAPTER 4: USING THE IEEE 1394-BASED PROTOCOL To read latches for individual points, see the memory map area “Digital Point Read—Read Only” on page 121, and use the on-latch or off-latch state starting address for the point you want to read. For example, you would read off-latch status for point 0 starting at address FFFFF0800002. To read a bank of points, see the memory map area “Digital Bank Read—Read Only” on page 119. The starting address for reading the state of on-latches is FFFFF0400008, and the starting address for off-latches is FFFFF0400010. To read and clear latches for individual points, see the memory map area “Digital Read and Clear—Read Only” on page 132. If you are reading and clearing the on-latch at point 1, for example, you would use the starting address FFFFF0F00104. For help in understanding the data you read, see “Formatting and Interpreting Data” on page 41. Counters This feature applies to digital points on I/O units with the following brains only: SNAP-UP1-ADS SNAP-B3000-ENET When configured, it will count the number of times the input changes from off to on. Using counters involves two steps: configuring the counter and reading data. Configuring a Counter To configure a digital input as a counter, first configure the point as an input. Write to the “Analog and Digital Point Configuration Information—Read/Write” area of the memory map. (See page 125.) For example, to configure point 0 as a counter, you would write to the memory map address FFFFF0C00004, using 00000100 as the data for a digital input. Next, configure the point feature as a counter. In the same area of the memory map, for point 0 you would write to the address FFFFF0C00008 and use 00000001 as the data for a counter. Reading a Counter SNAP-ENET-RTC SNAP-WLAN-FH-ADS You can: Read counters for individual points and leave them counting Read a bank of points and leave them counting Read and clear individual point counters in one step, setting the counters back to zero. To read counters for individual points, see the memory map area “Digital Point Read—Read Only” on page 121, and use the counter data starting address for the point you want to read. For example, you would read counter data for point 1 starting at address FFFFF0800044. SNAP Ethernet-Based I/O Units Protocols and Programming Guide 89
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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
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 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: Bytes 0-3 Bytes 4-7 Bytes 8-11 Byte
Page 101 and 102: Scaling CHAPTER 4: USING THE IEEE 1
Page 103 and 104: Read and Write Packet Structure Par
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
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Serial Event Configuration—Read/W
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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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