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72 Rockwell Automation Publication 750COM-UM002B-EN-P - October 2012
Chapter 6 Using Explicit Messaging
ControlLogix Controller Example Ladder Logic Program to Read
Multiple Parameters
A Scattered Read message is used to read the values of multiple parameters. This
read message example reads the values of these five 32-bit REAL (floating point)
parameters in a PowerFlex 750-Series drive:
• Parameter 001 - [Output Frequency]
• Parameter 007 - [Output Current]
• Parameter 008 - [Output Voltage]
• Parameter 009 - [Output Power]
• Parameter 011 - [DC Bus Volts]
See DPI Parameter Object
on page 109 (Class code 0x93) or Host DPI
Parameter Object on page 123 (Class code 0x9F) for parameter numbering.
Table 7 - Example Controller Tags to Read Multiple Parameters
Figure 17 - Example Ladder Logic to Read Multiple Parameters
Operand Controller Tags for Scattered Read Message Data Type
XIC Execute_Scattered_Read_Message BOOL
MSG Scattered_Read_Message MESSAGE
- User Manual 1
- Important User Information 2
- Summary of Changes 3
- New and Updated 3
- Information 3
- Table of Contents 5
- Conventions Used in This 9
- Rockwell Automation 9
- Additional Resources 10
- Getting Started 11
- Features 12
- Understanding Parameter 13
- Compatible Products 13
- Required Equipment 13
- User-Supplied Equipment 14
- Safety Precautions 15
- Quick Start 16
- Installing the Option Module 17
- Setting the Node Address 18
- Switches 18
- Setting the Data Rate Switch 19
- Connecting the Option 19
- Module to the Drive 19
- Module to the Network 20
- Start-Up Status Indications 21
- Commissioning the Option 24
- Configuring the Option Module 25
- Edit Net Addr Cfg 26
- Autobaud 3 27
- 0<<16 28
- Edit DLs To Net Cfg 29
- Value Description 30
- 1 Use this logic bit 30
- Changing the Fault Action 31
- Resetting the Option Module 32
- 0<<2 32
- Host Drive 33
- 240V 4.2A 33
- Rev 3.002 Ser. A 33
- Viewing the Option Module 34
- Status Using Parameters 34
- Updating the Option Module 35
- Firmware 35
- Configuring the I/O 37
- ControlLogix Controller 38
- Configuring the I/O Chapter 4 39
- I/O to the Scanner 41
- Chapter 4 Configuring the I/O 42
- Using the I/O 53
- Understanding the 54
- ControlLogix Controller I/O 54
- Using Logic Command/Status 54
- Using Reference/Feedback 55
- Using Datalinks 56
- Example Ladder Logic 57
- Program Information 57
- Program 59
- Status/Feedback 61
- Logic Command/Reference 61
- Generic Profile 62
- Using the I/O Chapter 5 63
- Chapter 5 Using the I/O 64
- Using Explicit Messaging 65
- About Explicit Messaging 66
- Examples 68
- Single Parameter 70
- Multiple Parameters 72
- Request (Source Data) array 79
- Troubleshooting 81
- PORT Status Indicator 82
- MOD Status Indicator 82
- NET A Status Indicator 83
- Viewing Option Module 84
- Diagnostic Items 84
- Viewing and Clearing Events 86
- Specifications 89
- Environmental 90
- Regulatory Compliance 90
- Option Module Parameters 91
- About Parameter Numbers 92
- How Parameters Are 92
- Organized 92
- Device Parameters 92
- Host Parameters 94
- DeviceNet Objects 99
- Identity Object 100
- Connection Object 101
- Register Object 102
- PCCC Object 103
- N-Files 105
- DPI Device Object 106
- Class Attributes 107
- Instance Attributes 108
- DPI Parameter Object 109
- Formula number 111
- Extended DPI descriptor 111
- Descriptor Attributes 112
- Formulas for Converting 114
- Common Services 114
- Object Specific Services 114
- DPI Fault Object 115
- DPI Alarm Object 117
- DPI Diagnostic Object 119
- DPI Time Object 121
- Host DPI Parameter Object 123
- 750-Series Drives 129
- History of Changes 131
- Appendix E History of Changes 132
- Glossary 133
- Rockwell Automation Support 144
- Documentation Feedback 144
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