Rosemount 848T Spécifications Page 19
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11
Reference Manual
00809-0100-4697, Rev GA
Section 2: Installation
November 2014
Installation
2.3.2 Power supply
Connections
The transmitter requires between 9 and 32 VDC to operate and provide complete functionality.
The DC power supply should provide power with less than 2% ripple. A fieldbus segment
requires a power conditioner to isolate the power supply filter and decouple the segment from
other segments attached to the same power supply.
All power to the transmitter is supplied over the signal wiring. Signal wiring should be shielded,
twisted pair for best results in electrically noisy environments. Do not use unshielded signal
wiring in open trays with power wiring or near heavy electrical equipment.
Use ordinary copper wire of sufficient size to ensure the voltage across the transmitter power
terminals does not go below 9 VDC. The power terminals are polarity insensitive. To power the
transmitter:
1. Connect the power leads to the terminals marked “Bus,” as shown in Figure 2-8.
2. Tighten the terminal screws to ensure adequate contact. No additional power wiring is
necessary.
Figure 2-8. Transmitter Label
A. Ground (required with T1 option)
B. Connect power leads here
2.3.3 Surges/transients
The transmitter will withstand electrical transients encountered through static discharges or
induced switching transients. However, a transient protection option (option code T1) is
available to protect the 848T against high-energy transients. The device must be properly
grounded using the ground terminal (see Figure 2-8).
2.4 Grounding
The 848T transmitter provides input/output isolation up to 620 V rms.
Note
Neither conductor of the fieldbus segment can be grounded. Grounding out one of the signal
wires will shut down the entire fieldbus segment.
NOT USED
SECURITY
SIMULA
TE ENABLE
A
B
- 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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