Rosemount 848T Specifikace Strana 108
- Strana / 136
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
98
Reference Manual
00809-0100-4697, Rev GA
Appendix D: Function Blocks
November 2014
Function Blocks
05 MODE_BLK None
The actual, target, permitted, and normal modes of
the block.
Actual: The mode the “block is currently in”
Target: The mode to “go to”
Permitted: Allowed modes that target may take on
Normal: Most common mode for target
06 BLOCK_ERR None
This parameter reflects the error status associated
with the hardware or software components
associated with a block. It is a bit string, so that
multiple errors may be shown.
07 PV
EU of
XD_SCALE
The process variable used in block execution.
08 OUT
EU of
OUT_SCALE
or XD_SCALE
if in direct
L_TYPE
The block output value and status.
09 SIMULATE None
A group of data that contains the current transducer
value and status, the simulated transducer value and
status, and the enable/disable bit.
10 XD_SCALE None
The high and low scale values, engineering units code,
and number of digits to the right of the decimal point
associated with the channel input value. The
XD_SCALE units code must match the units code of
the measurement channel in the transducer block. If
the units do not match, the block will not transition to
MAN or AUTO.
11 OUT_SCALE None
The high and low scale values, engineering units code,
and number of digits to the right of the decimal point
associated with OUT when L_TYPE is not direct.
12 GRANT_DENY None
Options for controlling access of host computers and
local control panels to operating, tuning, and alarm
parameters of the block. Not used by device.
13 IO_OPTS None
Allows the selection of input/output options used to
alter the PV. Low cutoff enabled is the only selectable
option.
14 STATUS_OPTS None
Allows the user to select options for status handling
and processing. The options supported in the AI block
are the following:
Propagate fault forward
Uncertain if limited
Bad if limited
Uncertain if Manual mode.
15 CHANNEL None
The CHANNEL value is used to select the
measurement value. Configure the CHANNEL
parameter before configuring the XD_SCALE
parameter. Refer to
Table 3-5 on page 11.
16 L_TYPE None
Linearization type. Determines whether the field
value is used directly (Direct), is converted linearly
(Indirect), or is converted with the square root
(Indirect Square Root).
17 LOW_CUT %
If percentage value of transducer input fails below
this, PV = 0.
Table D-1. Analog Input Function Block Parameters
Number Parameter Units Description
- 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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