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Reference MVI69-HART ♦ CompactLogix Platform
User Manual HART Multi-drop Master Communication Module
Page 98 of 169 ProSoft Technology, Inc.
March 29, 2012
Auto-Polling
This feature is enabled by setting the AUTO-POLL CODE (in the configuration
file) to a value of P (point-to-point). If the value N is entered for the parameter,
the auto-poll feature is disabled. When the feature is disabled, the channel will
only execute the commands enabled in the user command list. When the auto-
polling mode is enabled, the module will automatically acquire data from the
HART instruments attached to a channel without the use of user commands. If
user commands are present and enabled when the feature is enabled, they will
also be executed independent of auto-polling.
With the auto-poll feature enabled, the module automatically generates the
following HART commands and stores the data in the module's database at the
user-specified location:
CMD Description
0 Read Unique Identifier
3 Read Current and Four Dynamic Variables
13 Read Tag, Descriptor and Date
14 Read PV Sensor Information
15 Read Output Information
If the unit is set for point-to-point mode, the module will automatically gather the
information for the device with the polling address (short address) of zero and
place the data into the database. Each device requires a 50-word database area
with the format shown in the following table.
DB Byte
Offset
Type Description Byte
Cnt
Data
Source
Use of Data
0 byte Auto-polling command status bits 1 App Status
1 byte Last first status byte received from
device
1 Resp Status
2 byte Last second status byte received
from device
1 Resp Status
3 byte Manufacture ID Code 1 CMD 0 LongAddress
4 byte Device Type Code 1 CMD 0 LongAddress
5 byte Minimum number of preambles 1 CMD 0 Msgconstruction
6 byte Universal Command Major Rev # 1 CMD 0 Msgchoice
7 byte Device Revision Level 1 CMD 0 Info
8 byte Software Revision Level 1 CMD 0 Info
9 byte Hardware Revision Level/Physical
Signaling Code
1 CMD 0 Info
10 byte Device Flags 1 CMD 0 Info
11 to 13 byte Device ID 3 CMD 0 Long Address
14 byte Minimum number of preambles to
be sent with the response message
from the slave to the master.
1 CMD 0
15 byte Maximum number of device
variables
1 CMD 0 Info
16 to 17 word Configuration Change Counter 2 CMD 0 Info
- MVI69-HART 1
- Your Feedback Please 2
- How to Contact Us 2
- ProSoft Technology 2
- Product Documentation 2
- Warnings 3
- Battery Life Advisory 3
- Markings 4
- Contents 5
- 1 Start Here 11
- 1.1 System Requirements 12
- 1.2 Package Contents 13
- 1.4 Setting Jumpers 15
- 1.5 Installing the Module 16
- OMMUNICATIONS 21
- ONFIGURE 21
- 2 Module Configuration 25
- 2.1.2 Renaming PCB Objects 28
- 2.2.1 [MODULE] 29
- 2.2.2 [HART PORT x] 30
- 2.3 Hart Command Examples 42
- To download the project file 46
- 3 Ladder Logic 47
- 3.1.1 Controller Tags 48
- 4.1 LED Status Indicators 60
- 4.1.2 Troubleshooting 62
- IAGNOSTICS 65
- 4.2.2 Main Menu 67
- 4.2.3 HART Master Menu 69
- 4.2.4 Database View Menu 72
- 4.2.5 Data Analyzer 74
- 4.2.6 Data Analyzer Tips 76
- RANSFER 77
- 5 Reference 81
- 5.1 Product Specifications 82
- 5.2 Functional Overview 85
- 5.2.1 General Concepts 85
- 5.2.3 Normal Data Transfer 87
- Read Register Start: 0 88
- Read Register Count: 480 88
- Write Register Start: 480 88
- Write Register Count: 480 88
- Offset Description Length 91
- 0 Write Block ID 1 91
- 1 to n Write Data n 91
- 5.2.5 HART Channels 94
- N (None) N Y 95
- M (Multi-drop) Y Y 95
- P (Point-to-Point) Y Y 95
- 5.2.6 Master Driver Mode 96
- 5.6 Status Data Definition 109
- 5.6.1 Protocol Error Codes 113
- 5.7 HART Universal Commands 115
- COMMAND 12 - Read Message 120
- Word High Byte Low Byte 124
- 0 STATUS WORD 124
- COMMAND 17 - Write Message 125
- COMMAND 39 - EEPROM Control 134
- COMMAND 43 - Set PV Zero 138
- COMMAND 44 - Write PV Units 139
- COMMAND 45 - Trim DAC Zero 140
- COMMAND 46 - Trim DAC Gain 141
- 5.10.1 Notes 159
- In This Chapter 165
- Contacting Technical Support 165
- 6.1 Warranty Information 166
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