Emerson 848T manual MAI Block Troubleshooting, Application Information

Page 104

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA October 2011

Application Information

The intended use for this type of function block is for applications where the sensor types and functionality of each channel (i.e. the simulate, scaling, filtering, alarms type, and options) are the same.

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

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 D-6for 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.

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

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.

 

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

make sense

 

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

D-14

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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 Operation Maintenance SectionAppendix a TOC-2Safety Messages Section IntroductionProcess leaks could result in death or serious injury Electrical shock could cause death or serious injuryFieldbus host or configuration tool Maintenance of the Rosemount 848T Temperature TransmitterOverview 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 BoxWiring Spur Signal Wiring Devices 1 throughConnections Leads and terminalsAnalog Inputs RTD or Ohm InputsThermocouple or Millivolt Inputs Connectors Power SupplyOhm resistor in the loop when switched to the left Analog InputConnections Power SupplySurges/Transients Shielded Wire Grounding848T Power Supply Sensor Wires Shield ground points Transmitter Enclosure optionalMA loop Fieldbus busSwitches Simulate EnableSwitch is not functional SecurityTagging Commissioning TagTransmitter Tag Sensor TagUsing Conduit Entries InstallationUsing Cable Glands Section Configuration Standard ConfigurationTransmitter Configuration Custom Configuration Methods Rosemount 848T Common Configurations for High Density Applications Typical Profiling ApplicationFunction 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 Saveconfignow SaveconfigblocksStartwithdefaults FailedenableBlock Errors ModesAutomatic Auto Block is processing its normal background memory checksOut of Service OOS Alarm DetectionPlantWeb Alerts 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, Transducer Block Errors Transducer Block Channel DefinitionsChannel Definitions for the 848T Channel Description00809-0100-4697, Rev EA October Block/Transducer Error Transducer Block Alarm DetectionTransducer Block Modes Block outputs reflect the analog input measurementSENSOR1CONFIG SENSOR2CONFIGSENSOR3CONFIG SENSOR4CONFIGChanging the Sensor Configuration in the Transducer Block Transducer Block Sub-Parameter Tables 11. Xderror Sub-Parameter Structure12. Sensorconfig Sub-Parameter Structure 13. Sensorstatus Sub-Parameter Structure 14. Sensorcal Sub-Parameter Structure15. Calstatus 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 Hardware Maintenance Restart with DefaultsSensor Check Restart Processor cyclingTroubleshooting Transducer Block TroubleshootingSymptom Possible Cause Corrective Action Symptom Possible Causes Corrective ActionFunctional Specifications Appendix a Reference DataUpdate Time AlarmsBackup Link Active Scheduler LAS Transient ProtectionPhysical Specifications Performance Specifications Function BlocksSensor Option Sensor Reference 3-Wire RTDs Accuracy for Differential ConfigurationsAccuracy Input RangesSensor Option Alarm Levels Accuracy Analog Sensors 4-20mAAmbient Temperature Effect Dimensional Drawings Ambient Temperature Notes ExamplesRosemount 848T 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 ViewMounting Options Aluminum/Plastic Junction Box Styles JA and JPStainless Steel Junction Box Style JS Front View Side ViewOrdering Information OptionsSoftware Configuration Standard Special Temperature Test ExpandedConduit Electrical Connector Standard Enclosure Options StandardRosemount 848T Table B-2. Entity Parameters for Non Incendive Field Wiring Appendix B Product CertificatesHazardous Locations Certificates North American ApprovalsPower/Bus Canadian Standards Association CSA Certifications Power/Bus Sensor European ApprovalsAtex Certifications 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 BlocksInput OutputSnap Linkages StatusDevice Descriptions Block Operation Instrument- Specific Function Blocks AlertsResource Blocks Transducer BlocksFieldbus Link Network CommunicationLink Active Scheduler LAS LAS Parameters MID x ST DataBackup LAS Addressing Scheduled TransfersPublisher/Subscriber Report DistributionDevice Device Y Device Z Unscheduled TransfersSchedule Function Block Scheduling Appendix D Function Blocks Analog Input AI Function BlockNumber Parameter Units Description OUTAlarmhys XdscaleOutscale IooptsOUT mode in man OUT mode in autoFunctionalitySimulation 63% of ChangeSignal Conversion FilteringDirect IndirectIndirect Square Root ConditionsValue of the block output OUT may be set manually Table D-3. Alarm Priority LevelsManual Man Uncertain if in Manual mode Advanced FeaturesBAD if Limited Uncertain if LimitedAI Block Troubleshooting Application InformationXdblock 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 Input Selector Function Block Table D-6. Input Selector Function Block ParametersIN1 IN2 IN3 IN4 IN5 IN6 IN7 OUT OutrangeSelecttype MingoodSelected OpselectINn DISABLEn Mode Logic SelectionAlarm OUT FunctionalityTable D-8. Alarm Priority Levels OUT reflects the selected valueBlock Execution Use Uncertain as GoodIsel Block Troubleshooting Index NumericsConfiguration Errors Modes Automatic Maintalarms TroubleshootingAlarm Detection 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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