Emerson 848T manual Selecttype, Mingood, Selected, Opselect, Avguse, Hihi-Pri

Page 106

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA October 2011

Table D-6. Input Selector Function Block Parameters

Number

Parameter

Units

Description

15, 16, 17,

DISABLE_(1, 2,

None

A connection from another block that disables the associated input from the selection.

18, 29, 30,

3, 4, 5, 6, 7, 8)

 

 

31, 32

 

 

 

19

SELECT_TYPE

None

Specifies input selection method. Methods available include: First Good, Minimum,

 

 

 

Maximum, Middle, Average, or Hot Backup.

20

MIN_GOOD

None

The minimum number of good inputs.

21

SELECTED

None

The selected input number (1 to 8) or the number of input used for the average output.

22

OP_SELECT

None

Overrides the algorithm to select 1 of the 8 inputs regardless of the selection type.

23

UPDATE_EVT

None

This alert is generated by any change to the static data

24

BLOCK_ALM

None

The block alarm is used for all configuration, hardware, connection failure, or system

 

 

 

problems in the block. The cause of the alert is entered in the subcode field. The first

 

 

 

alert to become active will set the Active status in the Status parameter. As soon as the

 

 

 

Unreported status is cleared by the alert reporting task, another block may be reported

 

 

 

without clearing the Active status, if the subcode has changed.

33

AVG_USE

None

Number of parameters to use in the averaging calculation. For example, if AVG_USE is

 

 

 

4 and the number of connected inputs is 6, then the highest and lowest values would

 

 

 

be dropped prior to calculating the average. If AVG_USE is 2 and the number of

 

 

 

connected inputs is 7, then the two highest and lowest values would be dropped prior

 

 

 

to calculating the average and the average would be based on the middle three inputs.

34

ALARM_SUM

None

The current alert status, unacknowledged states, and disabled states of the alarms

 

 

 

associated with the function block.

35

ACK_OPTION

None

Used to set automatic acknowledgement of alarms.

36

ALARM_HYS

Percent

The amount the alarm value must return within the alarm limit before the associated

 

 

 

active alarm condition clears

37

HI_HI-PRI

None

The priority of the HI HI alarm

38

HI_HI_LIM

Percent

The setting for the alarm limit used to detect the HI HI alarm condition.

39

HI_PRI

None

The priority of the HI alarm

40

HI_LIM

EU of IN

The setting for the alarm limit used to detect the HI alarm condition

41

LO_PRI

None

The priority of the LO alarm

42

LO_LIM

EU of IN

The setting of the alarm limit used to detect the LO alarm condition

43

LO_LO_PRI

None

The priority of the LO LO alarm

44

LO_LO_LIM

EU of IN

The setting for the alarm limit sued to detect the LO LO alarm condition

45

HI_HI_ALM

None

The HI HI alarm data, which includes a value of the alarm, a timestamp of occurrence

 

 

 

and the state of the alarm

46

HI_ALM

None

The HI alarm data, which includes a value of the alarm, a timestamp of occurrence and

 

 

 

the state of the alarm

47

LO_ALM

None

The LO alarm data, which includes a value of the alarm, a timestamp of occurrence

 

 

 

and the state of the alarm

48

LO_LO_ALM

None

The LO LO alarm data, which includes a value of the alarm, a timestamp of occurrence

 

 

 

and the state of the alarm

49

OUT_D

None

Discrete output to indicate a selected alarm value

50

ALM_SEL

None

Used to select the process alarm conditions that will cause the OUT_D parameter to

 

 

 

be set.

D-16

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Contents Reference Manual 00809-0100-4697, Rev EA OctoberPage Rosemount 848T High Density Temperature Transmitter with Customer Central National Response Center InternationalPage Table of Contents Appendix a Operation MaintenanceSection TOC-2Process leaks could result in death or serious injury Safety MessagesSection Introduction Electrical shock could cause death or serious injuryOverview Fieldbus host or configuration toolMaintenance of the Rosemount 848T Temperature Transmitter TransmitterService Support Rosemount 848T Section Installation Safety Messages MountingMounting to a DIN Rail Without an Enclosure Mounting to a Panel with a Junction BoxMounting to a 2-in. Pipe Stand Aluminum/Plastic Junction Box Stainless Steel Junction BoxConnections WiringSpur Signal Wiring Devices 1 through Leads and terminalsThermocouple or Millivolt Inputs RTD or Ohm InputsAnalog Inputs Ohm resistor in the loop when switched to the left ConnectorsPower Supply Analog InputSurges/Transients Power SupplyConnections Shielded Wire GroundingMA loop 848T Power Supply Sensor Wires Shield ground pointsTransmitter Enclosure optional Fieldbus busSwitch is not functional SwitchesSimulate Enable SecurityTransmitter Tag TaggingCommissioning Tag Sensor TagUsing Cable Glands InstallationUsing Conduit Entries Section Configuration Transmitter Configuration Custom Configuration Methods ConfigurationStandard Rosemount 848T Function Common Configurations for High Density ApplicationsTypical Profiling Application BlockMeasuring Temperature Points Individually Monitoring Application with a Single SelectionMultiple Analog Input or Analog Input Block Configuration Resource Block Block ConfigurationNumber Parameter Description 00809-0100-4697, Rev EA October Resource Block Parameters Startwithdefaults SaveconfignowSaveconfigblocks FailedenableAutomatic Auto Block ErrorsModes Block is processing its normal background memory checksPlantWeb Alerts Out of Service OOSAlarm Detection Status Handling00809-0100-4697, Rev EA October Failure Alarms FailedmaskAdvisory Alarms Maintenance Alarms/Priority AlarmAlarm Alarm Type Active Event Recommended Action Recommended Actions for PlantWeb AlertsRESOURCE.HARDWAREREV, Transducer BlocksRESOURCE.RBSFTWRREVALL Channel Definitions for the 848T Transducer Block ErrorsTransducer Block Channel Definitions Channel DescriptionTransducer Block Modes 00809-0100-4697, Rev EA October Block/Transducer ErrorTransducer Block Alarm Detection Block outputs reflect the analog input measurementSENSOR3CONFIG SENSOR1CONFIGSENSOR2CONFIG SENSOR4CONFIGChanging the Sensor Configuration in the Transducer Block 12. Sensorconfig Sub-Parameter Structure 11. Xderror Sub-Parameter StructureTransducer Block Sub-Parameter Tables 15. Calstatus Structure 13. Sensorstatus Sub-Parameter Structure14. Sensorcal Sub-Parameter Structure 16. Transducer Status Sub-Parameter StructureDual Sensor Status Table StructureStructure Sensor Calibration in the Sensor Transducer Block 20. Validation Config Sub-Parameter StructureStructure Parameter Description Rosemount 848T Foundation Fieldbus Information Operation and MaintenanceFoundation Commissioning Addressing Sensor Check Hardware MaintenanceRestart with Defaults Restart Processor cyclingSymptom Possible Cause Corrective Action TroubleshootingTransducer Block Troubleshooting Symptom Possible Causes Corrective ActionFunctional Specifications Appendix a Reference DataBackup Link Active Scheduler LAS Update TimeAlarms Transient ProtectionPhysical Specifications Performance Specifications Function BlocksAccuracy Sensor Option Sensor Reference 3-Wire RTDsAccuracy for Differential Configurations Input RangesSensor Option Alarm Levels Accuracy Analog Sensors 4-20mAAmbient Temperature Effect Rosemount 848T Dimensional DrawingsAmbient Temperature Notes Examples Top ViewSide View Front View Stainless Steel Junction Box-Cable Gland option code JS2Front View Side View Stainless Steel Junction Box-Conduit Entry option code JS3 Side ViewStainless Steel Junction Box Style JS Mounting OptionsAluminum/Plastic Junction Box Styles JA and JP Front View Side ViewOrdering Information OptionsConduit Electrical Connector Standard Software Configuration StandardSpecial Temperature Test Expanded Enclosure Options StandardRosemount 848T Hazardous Locations Certificates Table B-2. Entity Parameters for Non Incendive Field WiringAppendix B Product Certificates North American ApprovalsPower/Bus Canadian Standards Association CSA Certifications Atex Certifications Power/Bus SensorEuropean Approvals Special Conditions for Safe UseCi = Li = Rosemount 848T Special Conditions of Safe Use IECEx CertificationsRosemount 848T Parameters Terminals of power/loop China NEPSICertificationsJapanese Certifications Intrinsically Safe and NON-INCENDIVE Installations Installation Drawings Figure B-1. FM Intrinsic Safety/ Fisco 00809-0100-4697, Rev EA Rosemount 848T Figure B-2. CSA Intrinsic Safety/ Fisco Rosemount 848T Rosemount 848T Appendix C Foundation fieldbus Technology Overview Function BlocksSnap InputOutput Linkages StatusResource Blocks Device Descriptions Block OperationInstrument- Specific Function Blocks Alerts Transducer BlocksLink Active Scheduler LAS Network CommunicationFieldbus Link LAS Parameters MID x ST DataPublisher/Subscriber Backup LASAddressing Scheduled Transfers Report DistributionSchedule Unscheduled TransfersDevice Device Y Device Z Function Block Scheduling Number Parameter Units Description Appendix D Function BlocksAnalog Input AI Function Block OUTOutscale AlarmhysXdscale IooptsFunctionalitySimulation OUT mode in manOUT mode in auto 63% of ChangeDirect Signal ConversionFiltering IndirectIndirect Square Root ConditionsManual Man Table D-3. Alarm Priority LevelsValue of the block output OUT may be set manually BAD if Limited Uncertain if in Manual modeAdvanced Features Uncertain if LimitedXdblock AI Block TroubleshootingApplication Information HIHILIMIT, LolimitMultiple Analog Input MAI Function Block Table D-4. Multiple Analog Input Function Block ParametersCAPSTDDEV1 Figure D-4. Multiple Analog Input Function Block Schematic SimulateDevices such as flowmeters Option in Manual or Out of Service mode onlyTable D-5. Blockerr Conditions Block output OUT may be set manually MAI Block Troubleshooting IN1 IN2 IN3 IN4 IN5 IN6 IN7 Input Selector Function BlockTable D-6. Input Selector Function Block Parameters OUT OutrangeSelected SelecttypeMingood OpselectAlarm OUT INn DISABLEnMode Logic Selection FunctionalityTable D-8. Alarm Priority Levels OUT reflects the selected valueBlock Execution Use Uncertain as GoodIsel Block Troubleshooting Index NumericsAlarm Detection Configuration Errors Modes AutomaticMaintalarms Troubleshooting Errors Modes AutomaticPage Rosemount Inc Pacific Private Limited

848T specifications

The Emerson 848T is a state-of-the-art temperature transmitter designed for accurate and reliable temperature measurement in various industrial applications. This device has gained recognition for its advanced features and robust performance, making it a popular choice among engineers and technicians in the field.

One of the key highlights of the Emerson 848T is its unique dual-channel capability, which allows it to seamlessly monitor two temperature sources simultaneously. This functionality is particularly beneficial in processes where multiple temperature points need to be assessed, optimizing efficiency and reducing the need for additional equipment. It supports various sensor types, including thermocouples, RTDs, and resistance temperature detectors, making it versatile for different applications.

The 848T is equipped with sophisticated digital processing technology, which enhances its accuracy and stability. It features a 24-bit analog-to-digital converter, ensuring precise measurement and minimizing drift over time. Moreover, the device boasts a wide operating temperature range, accommodating ambient conditions from -40°C to 85°C. This durability makes it suitable for harsh environments commonly encountered in industries such as oil and gas, pharmaceuticals, and power generation.

Another significant characteristic of the Emerson 848T is its configurable output options. Users can choose from a range of output signals, including 4-20 mA, which provides a standard interface for integration into existing control systems. Additionally, it offers a HART communication protocol, allowing for easy configuration, calibration, and diagnostics through a digital interface. This feature enhances the transmitter's usability, enabling operators to perform adjustments without direct access to the device.

The device is designed with user-friendliness in mind. Its intuitive setup procedure and robust graphical user interface simplify the commissioning process, ensuring that even those new to the technology can easily navigate the system. An integrated LCD display provides real-time readings and status information, facilitating monitoring at a glance.

In summary, the Emerson 848T temperature transmitter combines reliable performance, user-friendly design, and advanced digital technologies. Its dual-channel capability, wide sensor compatibility, and adjustable output options make it an essential tool for achieving precise temperature measurements in various industrial settings. With these compelling features, the Emerson 848T stands out as a leading choice for professionals seeking accuracy and efficiency in their temperature monitoring applications.
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