Emerson 848T manual AI Block Troubleshooting, Application Information, Xdblock, HIHILIMIT, Lolimit

Page 98

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA October 2011

Application Information

The configuration of the AI function block and its associated output channels depends on the specific application. A typical configuration for the AI block involves the following parameters:

CHANNEL

The device supports more than one measurement, so verify that the selected channel contains the appropriate measurement or derived value. Refer to Table 3-5 on page 3-11for a listing of available channels on the 848T.

L_TYPE

Select Direct when the measurement is 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.

SCALING

XD_SCALE provides the range and units of the measurement and

OUT_SCALE provides the range and engineering units of the output.

OUT_SCALE is only used when in indirect or indirect square root.

AI 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:

 

 

• CHANNEL must be set to a valid value and cannot be left at initial value of 0.

 

 

• XD_SCALE.UNITS_INDEX must match the units in the transducer block

 

 

channel value. Setting the units in the AI block automatically sets them in the

 

 

XD_BLOCK.

 

 

• 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

Features

FEATURES_SEL does not have Alerts enabled. Enable the Alerts bit.

alarms will not work.

Notification

LIM_NOTIFY is not high enough. Set equal to MAX_NOTIFY. Alarm not linked to host.

 

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

Linearization Type

L_TYPE must be set to Direct, Indirect, or Indirect Square Root and cannot be left at

make sense

 

initial value of 0.

 

Scaling

Scaling parameters are set incorrectly:

 

 

• XD_SCALE.EU0 and EU100 should match that of the transducer block

 

 

channel value.

 

 

• OUT_SCALE.EU0 and EU100 are not set properly.

 

 

• Both STB on each asic used must by in auto.

Cannot set HI_LIMIT,

Scaling

Limit values are outside the OUT_SCALE.EU0 and OUT_SCALE.EU100 values.

HI_HI_LIMIT, LO_LIMIT,

 

Change OUT_SCALE or set values within range.

or LO_LO_LIMIT Values

 

 

D-8

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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 terminalsAnalog Inputs RTD or Ohm InputsThermocouple or Millivolt Inputs Ohm resistor in the loop when switched to the left ConnectorsPower Supply Analog InputConnections Power SupplySurges/Transients 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 Conduit Entries InstallationUsing Cable Glands Section Configuration Standard ConfigurationTransmitter Configuration Custom Configuration Methods 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 Number Parameter Description Block ConfigurationResource Block 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 FailedmaskAlarm Maintenance Alarms/Priority AlarmAdvisory Alarms Alarm Type Active Event Recommended Action Recommended Actions for PlantWeb AlertsRESOURCE.RBSFTWRREVALL Transducer BlocksRESOURCE.HARDWAREREV, 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 Transducer Block Sub-Parameter Tables 11. Xderror Sub-Parameter Structure12. Sensorconfig Sub-Parameter Structure 15. Calstatus Structure 13. Sensorstatus Sub-Parameter Structure14. Sensorcal Sub-Parameter Structure 16. Transducer Status Sub-Parameter StructureStructure StructureDual Sensor Status Table Structure Parameter Description 20. Validation Config Sub-Parameter StructureSensor Calibration in the Sensor Transducer Block Rosemount 848T Foundation Operation and MaintenanceFoundation Fieldbus Information 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 ViewFront View Side View Stainless Steel Junction Box-Cable Gland option code JS2Side View Front 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 BlocksFieldbus Link Network CommunicationLink Active Scheduler LAS LAS Parameters MID x ST DataPublisher/Subscriber Backup LASAddressing Scheduled Transfers Report DistributionDevice Device Y Device Z Unscheduled TransfersSchedule 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 ConditionsValue of the block output OUT may be set manually Table D-3. Alarm Priority LevelsManual Man 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 SimulateTable D-5. Blockerr Conditions Option in Manual or Out of Service mode onlyDevices such as flowmeters 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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