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Reference Manual
00809-0100-4697, Rev GA
Appendix D: Function Blocks
November 2014
Function Blocks
Status handling
Normally, the status of the PV reflects the status of the measurement value, the operating
condition of the I/O card, and any active alarm condition. In Auto mode, OUT reflects the value
and status quality of the PV. In Man mode, the OUT status constant limit is set to indicate that
the value is a constant and the OUT status is Good.
If the sensor limit exceeds the high or low range, PV status is set high or low and EU range status
is set to uncertain.
In the STATUS_OPTS parameter, select from the following options to control the status
handling.
BAD if limited
Sets the OUT status quality to Bad when the value is higher or lower than the sensor limits.
Uncertain if limited
Sets the OUT status quality to Uncertain when the value is higher or lower than the sensor
limits.
Uncertain if in manual mode
The status of the Output is set to Uncertain when the mode is set to Manual.
Notes
1. The instrument must be in OOS mode to set the status option.
2. The AI block only supports the BAD if Limited option, uncertain if limited, and uncertain if
manual.
Advanced features
The AI function block provided with Rosemount
®
fieldbus devices provides added capability
through the addition of the following parameters:
ALARM_TYPE
Allows one or more of the process alarm conditions detected by the AI function block to be
used in setting its OUT_D parameter.
OUT_D
Discrete output of the AI function block based on the detection of process alarm
condition(s). This parameter may be linked to other function blocks that require a discrete
input based on the detected alarm condition.
STD_DEV and CAP_STDDEV
Diagnostic parameters that can be used to determine the variability of the process.
Application information
The configuration of the AI function block and its associated output channels depends on the
specific application. A typical configuration for the AI block involves the following parameters:
CHANNEL
The device supports more than one measurement, so verify that the selected channel
contains the appropriate measurement or derived value. Refer to Table 3-8 on page 36 for a
listing of available channels on the 848T.
- 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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