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Reference Manual
00809-0100-4697, Rev GA
Appendix D: Function Blocks
November 2014
Function Blocks
CHANNEL
If the device supports more than one measurement, verify that the selected channel
contains the appropriate measurement or derived value. Refer to Table D-4 on page 106 for
a listing of available channels on the 848T.
L_TYPE
Select Direct when the measurement is already in the desired engineering units for the
block output. Select Indirect when converting the measured variable into another, for
example, pressure into level or flow into energy. Select Indirect Square Root when the block
I/O parameter value represents a flow measurement made using differential pressure, and
when square root extraction is not performed by the transducer.
SCALING
XD_SCALE provides the range and units of the measurement and OUT_SCALE provides the
range and engineering units of the output.
D.2.2 MAI block troubleshooting
Symptom Possible causes Corrective action
Mode will not leave
OOS
Target mode not set Set target mode to something other than OOS.
Configuration error BLOCK_ERR will show the configuration error bit set. The following are
parameters that must be set before the block is allowed out of OOS:
•Initial value is 1.
•XD_SCALE
.UNITS_INDEX must match the units in all the corresponding
sensor transducer blocks.
• L_TYPE must be set to Direct, Indirect, or Indirect Square Root and cannot be
left at initial value of 0.
Resource block The actual mode of the Resource block is OOS. See Resource Block
Diagnostics for corrective action.
Schedule Block is not scheduled and therefore cannot execute to go to Target
Mode. Typically, BLOCK_ERR will show “Power-Up” for all blocks that are
not scheduled. Schedule the block to execute.
Process and/or block
alarms will not work.
Features FEATURES_SEL does not have Alerts enabled. Enable the Alerts bit.
Notification LIM_NOTIFY is not high enough. Set equal to MAX_NOTIFY.
Status Options STATUS_OPTS has Propagate Fault Forward bit set. This should be
cleared to cause an alarm to occur.
Value of output does
not make sense
Linearization Type L_TYPE must be set to Direct, Indirect, or Indirect Square Root and
cannot be left at initial value of 0.
Scaling Scaling parameters are set incorrectly:
• XD_SCALE.EU0 and EU100 should match that of the corresponding sensor
transducer block.
•OUT_SCALE
.EU0 and EU100 are not set properly.
• Both STBs in an ASIC must be set to auto. Best in 1, 2, 7, 8, ASICs in Auto for
thermocouples
- 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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