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Reference Manual
00809-0100-4697, Rev GA
Section 4: Operation and Maintenance
November 2014
Operation and Maintenance
Table 4-1. Block Diagram for the Rosemount 848T
4.2.1 Commissioning (addressing)
To be able to setup, configure, and have it communicate with other devices on a segment, a
device must be assigned a permanent address. Unless requested otherwise, it is assigned a
temporary address when shipped from the factory.
If there are two or more devices on a segment with the same address, the first device to start up
will use the assigned address (ex. Address 20). Each of the other devices will be given one of the
four available temporary addresses. If a temporary address is not available, the device will be
unavailable until a temporary address becomes available.
Use the host system documentation to commission a device and assign a permanent address.
4.3 Hardware maintenance
The 848T has no moving parts and requires a minimal amount of scheduled maintenance. If a
malfunction is suspected, check for an external cause before performing the diagnostics
presented below.
4.3.1 Sensor check
To determine whether the sensor is causing the malfunction, connect a sensor calibrator or
simulator locally at the transmitter. Consult an Emerson Process Management
representative for additional temperature sensor and accessory assistance.
4.3.2 Communication/power check
If the transmitter does not communicate or provides an erratic output, check for adequate
voltage to the transmitter. The transmitter requires between 9.0 and 32.0 VDC at the terminals
to operate with complete functionality. Check for wire shorts, open circuits, and multiple
grounds.
FOUNDATION
fieldbus
Communications
Stack
Analog-to-Digital
Signal Conversion
Cold Junction
Input-to-Output
Isolation
Resource
Block
•physical
device
information
Function Blocks
•AI, MAI, and ISEL
Transducer Block
Measurement Sensor
•sensor and differential
temp
•terminal temp.
•sensor configuration
•calibration
•diagnostics
(8 sensors)
- 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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