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Reference Manual
00809-0100-4697, Rev GA
Appendix C: FOUNDATION Fieldbus Technology
November 2014
FOUNDATION Fieldbus Technology
The Fieldbus Foundation specifications and definitions allow vendors to add their own
parameters by importing and subclassing specified classes. This approach permits extending
function block definitions as new requirements are discovered and as technology advances.
Figure C-1 illustrates the internal structure of a function block. When execution begins, input
parameter values from other blocks are snapped-in by the block. The input snap process ensures
that these values do not change during the block execution. New values received for these
parameters do not affect the snapped values and will not be used by the function block during
the current execution.
Figure C-1. Function Block Internal Structure
Once the inputs are snapped, the algorithm operates on them, generating outputs as it
progresses. Algorithm executions are controlled through the setting of contained parameters.
Contained parameters are internal to function blocks and do not appear as normal input and
output parameters. However, they may be accessed and modified remotely, as specified by the
function block.
Input events may affect the operation of the algorithm. An execution control function regulates
the receipt of input events and the generation of output events during execution of the
algorithm. Upon completion of the algorithm, the data internal to the block is saved for use in
the next execution, and the output data is snapped, releasing it for use by other function blocks.
A block is a tagged logical processing unit. The tag is the name of the block. System
management services locate a block by its tag. Thus the service personnel need only know the
tag of the block to access or change the appropriate block parameters.
Function blocks are also capable of performing short-term data collection and storage for
reviewing their behavior.
C.3 Device descriptions
Device descriptions (DD) are specified tool definitions that are associated with the Resource and
Transducer Blocks. Device descriptions provide the definition and description of the function
blocks and their parameters.
To promote consistency of definition and understanding, descriptive information, such as data
type and length, is maintained in the device description. Device Descriptions are written using
an open language called the Device Description Language (DDL). Parameter transfers between
function blocks can be easily verified because all parameters are described using the same
language. Once written, the device description can be stored on an external medium, such as a
CD-ROM or diskette. Users can then read the device description from the external medium. The
use of an open language in the device description permits interoperability of function blocks
Input Events Output Events
Input
Parameter
Linkages
Output
Parameter
Linkages
Processing
Algorithm
Execution
Control
Input
Snap
Status
Output
Snap
Status
- Transmitter with FOUNDATION 1
- fieldbus 1
- Transmitter with F 3
- Title Page 4
- 1Section 1: Introduction 5
- 2Section 2: Installation 5
- 3Section 3: Configuration 5
- AAppendix A: Reference Data 6
- DAppendix D: Function Blocks 8
- Section 1 Introduction 9
- 00809-0100-4697, Rev GA 10
- November 2014 10
- OUNDATION fieldbus Technology 10
- 1.3 Service support 11
- Section 1: Introduction 12
- Introduction 12
- Section 2 Installation 13
- 2-in. screws 14
- 2.3 Wiring 16
- RTD or ohm inputs 17
- Analog inputs 17
- 2.4 Grounding 19
- Shielded wire 20
- Grounded thermocouple inputs 21
- Analog device inputs 21
- 2.5 Switches 22
- 2.6 Tagging 22
- Transmitter tag 23
- Sensor tag 23
- 2.7 Installation 24
- 2.7.2 Using conduit entries 25
- Section 2: Installation 26
- Section 3 Configuration 27
- 3.2 Configuration 28
- 3.2.5 Alarms 29
- 3.2.6 Damping 29
- Typical profiling application 31
- OUNDATION fieldbus 33
- Section 3: Configuration 34
- Number Parameter Description 34
- OUNDATION 35
- How to use PlantWeb Alarm 39
- 3.4.3 PlantWeb alerts 40
- MAINT_ALARMS 41
- Advisory alarms 42
- RECOMMENDED_ACTION 43
- FD failed alarms 44
- Configuration 45
- FD CHECK ALARMS 47
- 3.4.7 Transducer blocks 49
- Transducer block errors 50
- Transducer block modes 50
- Automatic (Auto) 51
- Out of Service (OOS) 51
- 4.4.2 Resource block 64
- Appendix A Reference Data 65
- OUNDATION fieldbus parameters 66
- A.3 Function blocks 67
- A.4.1 Stability 68
- A.4.2 Self calibration 68
- A.4.3 Vibration effect 68
- A.4.5 Accuracy 68
- A.4.8 Analog sensors 4–20mA 69
- Reference Data 70
- Examples 71
- A.5 Dimensional drawings 72
- A.5.1 Mounting options 74
- A.6 Ordering information 75
- Approvals 77
- B.3.2 Canada 78
- B.4 Europe 79
- B.5 International 81
- B.5.1 Brazil 83
- B.5.2 China 84
- B.5.3 Japan 86
- B.6 Combinations 87
- B.8 Additional Certifications 88
- B.10 Installation drawings 90
- Product Certificates 91
- Appendix C FOUNDATION 99
- Technology 99
- C.3 Device descriptions 100
- C.4 Block operation 101
- C.5 Network communication 101
- C.5.1 LAS 102
- C.5.2 Addressing 103
- C.5.3 Scheduled transfers 104
- C.5.4 Unscheduled transfers 105
- OUNDATION Fieldbus Technology 106
- Appendix D Function Blocks 107
- Reference Manual 108
- Appendix D: Function Blocks 108
- Table 3-5 on page 11 108
- D.1.1 Functionality 110
- Filtering 111
- Signal conversion 111
- Indirect 111
- Indirect square root 112
- Block errors 112
- Alarm detection 113
- Status handling 114
- Advanced features 114
- Application information 114
- D.2.1 Functionality 118
- D.3.1 Functionality 125
- Block execution 127
- AVG_USE = 6 129
- Numerics 131
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