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5-2 Using Block Transfer Messaging
20-COMM-R Remote I/O Adapter User Manual
Publication 20COMM-UM004D-EN-P
About Block Transfer
Messaging
Block Transfer messaging is used to transfer data to the drive. The size of
Block Transfer messages to the Remote I/O adapter determines their
purpose.
Block Transfer I/O
For information about Block Transfer I/O messages, see Chapter 4, Using
Discrete and Block Transfer I/O.
One Block Transfer request is processed per Remote I/O rack scan, but
multiple requests to a rack can be initiated. You can use Block Transfer
Read messages to gather input and status data from the adapter and Block
Transfer Write messages to send output and configuration data to the
adapter and connected drive.
Formatting Block Transfer
Messages
Using Block Transfer to Initiate Explicit Messages
Figure 5.1 Explicit Message Format
Most Significant Byte = bits 15…8
Least Significant Byte = bits 7…0
See Block Transfer Write Structure to Send Block Transfer Messages on
page 5-3 for a description of each word in a Block Transfer Write used to
initiate Explicit Messages.
Words Type Used For See
18 or fewer I/O Reference/Feedback and Datalinks Chapter
4
20, 30, or 60 Explicit Configuring and monitoring data This chapter
Other Not Recognized Do not use or an error will occur.
—
Bit 15 0 15 0
Word 0 0x00 Length 0x00 Length
Word 1 DPI Port 0x81 Status Type Status Size
Word 2 0x00 CIP Service Status Information
Word 3 CIP Class Data or Padding
Word 4 CIP Instance
Word 5 CIP Attribute
Word 6 Data or Padding
…
Word 19
(20 word BTW length)
- or -
Word 29
(30 word BTW length)
- or -
Word 59
(60 word BTW length)
Block Transfer Write
Block Transfer Read
- User Manual 1
- Important User Information 2
- Summary of Changes 3
- Table of Contents 5
- About This Manual 7
- Rockwell Automation 8
- Additional Resources 8
- Resource Description 9
- About This Manual P-3 9
- P-4 About This Manual 10
- Getting Started 11
- Features 12
- Compatible Products 13
- Required Equipment 13
- User-Supplied Equipment 14
- Safety Precautions 15
- Quick Start 16
- Installing the Adapter 17
- Commissioning the Adapter 18
- Connecting the Adapter to 20
- Applying Power 24
- 2-10 Installing the Adapter 26
- Configuring the Adapter 27
- Using the PowerFlex 7-Class 28
- HIM to Access Parameters 28
- Setting the Rack Address 29
- Setting the Baud Rate 30
- Setting the Starting Module 30
- Setting the Last Rack 31
- Setting the Rack Size 31
- Setting the I/O 32
- Configuration 32
- Setting a Fault Action 33
- Resetting the Adapter 34
- Viewing the Adapter Status 35
- Using Parameters 35
- Updating the Adapter 36
- Firmware 36
- Chapter 4 37
- Understanding the I/O Image 38
- Discrete I/O Image 40
- Size Valid Values 41
- 16-bit -32768 to 32767 41
- Block Transfer I/O Image 43
- Rules for Using Datalinks 44
- Datalink Scaling 45
- Example Ladder Logic 47
- Program Information 47
- ControlLogix Controller 48
- PLC-5 Controller Example 51
- Block Transfer Read 53
- Block Transfer Write 54
- All Controller Versions 55
- Chapter 5 59
- About Block Transfer 60
- Messaging 60
- Formatting Block Transfer 60
- Messages 60
- Executing Block Transfers 63
- Example Programs 64
- Ladder Logic Program 66
- SLC 500 Controller 69
- Examples 69
- Troubleshooting 75
- PORT Status Indicator 76
- MOD Status Indicator 76
- NET A Status Indicator 77
- Viewing Adapter Diagnostic 77
- Viewing and Clearing 79
- Table 6.B Adapter Events 80
- Specifications 81
- Regulatory Compliance 82
- Adapter Parameters 83
- CIP Objects 87
- Common Messages 88
- DPI Device Object 89
- DPI Parameter Object 91
- Descriptor Attributes 93
- Formulas for Converting 94
- Object-Specific Services 94
- DPI error code 95
- DPI Fault Object 101
- Instance Attributes 102
- DPI Alarm Object 103
- DPI Time Object 105
- C-20 CIP Objects 106
- Logic Command/Status Words 107
- Logic Status Word 108
- PowerFlex 700S (Phase II 109
- Control) and 700L (with 109
- 700S Control) Drives 109
- PowerFlex 750-Series Drives 111
- PowerFlex Digital DC Drives 113
- Glossary 115
- D Datalinks 116
- F Fault Action 117
- I Idle Action 118
- L Last RIO Rack 118
- N NVS (Nonvolatile Storage) 118
- R Rack Address 119
- S Scanner 120
- U Update 120
- Z Zero Data 120
- Rockwell Automation Support 128
- Documentation Feedback 128
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