Emerson 848T manual Appendix C Foundation fieldbus Technology, Overview Function Blocks

Page 83

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Appendix C FOUNDATION™ fieldbus Technology

OVERVIEW

FUNCTION BLOCKS

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-1 Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-1 Device Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-3 Block Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-3 Network Communication . . . . . . . . . . . . . . . . . . . . . . . . . . page C-4

FOUNDATION fieldbus is an all-digital, serial, two-way, multidrop communication protocol that interconnects devices such as transmitters, sensors, actuators, and valve controllers. Fieldbus is a Local Area Network (LAN) for instruments that are used in both process and manufacturing automation, having the built-in capability to distribute the control applications across the network. The fieldbus environment is the base level group of digital networks and the hierarchy of plant networks.

The FOUNDATION fieldbus retains the desirable features of the 4–20 mA analog system, including standardized physical interface to the wire, bus-powered devices on a single pair of wires, and intrinsic safety options. It also enables the following capabilities:

•Increased capabilities due to full digital communication.

•Reduced wiring and wire terminations due to multiple devices on one pair of wires.

•Increased supplier selection due to interoperability

•Reduced loading on control room equipment due to the distribution of some control and input/output functions to field devices.

FOUNDATION fieldbus devices work together to provide I/O and control for automated processes and operations. The Fieldbus FOUNDATION provides a framework for describing these systems as a collection of physical devices interconnected by a fieldbus network. One of the ways that the physical devices are used is to perform their portion of the total system operation by implementing one or more function blocks.

Function blocks perform process control functions, such as analog input (AI) and analog output (AO) functions as well as proportional-integral-derivative (PID) functions. The standard function blocks provide a common structure for defining function block inputs, outputs, control parameters, events, alarms, and modes, and combining them into a process that can be implemented within a single device or over the fieldbus network. This simplifies the identification of characteristics that are common to function blocks.

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Contents 00809-0100-4697, Rev EA October Reference ManualPage Customer Central National Response Center International Rosemount 848T High Density Temperature Transmitter withPage Table of Contents TOC-2 Operation MaintenanceSection Appendix aElectrical shock could cause death or serious injury Safety MessagesSection Introduction Process leaks could result in death or serious injuryTransmitter Fieldbus host or configuration toolMaintenance of the Rosemount 848T Temperature Transmitter OverviewService Support Rosemount 848T Safety Messages Mounting Section InstallationMounting to a Panel with a Junction Box Mounting to a DIN Rail Without an EnclosureAluminum/Plastic Junction Box Stainless Steel Junction Box Mounting to a 2-in. Pipe StandLeads and terminals WiringSpur Signal Wiring Devices 1 through ConnectionsAnalog Inputs RTD or Ohm InputsThermocouple or Millivolt Inputs Analog Input ConnectorsPower Supply Ohm resistor in the loop when switched to the leftConnections Power SupplySurges/Transients Grounding Shielded WireFieldbus bus 848T Power Supply Sensor Wires Shield ground pointsTransmitter Enclosure optional MA loopSecurity SwitchesSimulate Enable Switch is not functionalSensor Tag TaggingCommissioning Tag Transmitter TagUsing Conduit Entries InstallationUsing Cable Glands Section Configuration Standard ConfigurationTransmitter Configuration Custom Configuration Methods Rosemount 848T Block Common Configurations for High Density ApplicationsTypical Profiling Application FunctionMonitoring Application with a Single Selection Measuring Temperature Points IndividuallyMultiple Analog Input or Analog Input Block Configuration Number Parameter Description Block ConfigurationResource Block 00809-0100-4697, Rev EA October Resource Block Parameters Failedenable SaveconfignowSaveconfigblocks StartwithdefaultsBlock is processing its normal background memory checks Block ErrorsModes Automatic AutoStatus Handling Out of Service OOSAlarm Detection PlantWeb AlertsFailedmask 00809-0100-4697, Rev EA October Failure AlarmsAlarm Maintenance Alarms/Priority AlarmAdvisory Alarms Recommended Actions for PlantWeb Alerts Alarm Type Active Event Recommended ActionRESOURCE.RBSFTWRREVALL Transducer BlocksRESOURCE.HARDWAREREV, Channel Description Transducer Block ErrorsTransducer Block Channel Definitions Channel Definitions for the 848TBlock outputs reflect the analog input measurement 00809-0100-4697, Rev EA October Block/Transducer ErrorTransducer Block Alarm Detection Transducer Block ModesSENSOR4CONFIG SENSOR1CONFIGSENSOR2CONFIG SENSOR3CONFIGChanging the Sensor Configuration in the Transducer Block Transducer Block Sub-Parameter Tables 11. Xderror Sub-Parameter Structure12. Sensorconfig Sub-Parameter Structure 16. Transducer Status Sub-Parameter Structure 13. Sensorstatus Sub-Parameter Structure14. Sensorcal Sub-Parameter Structure 15. Calstatus 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 Restart Processor cycling Hardware MaintenanceRestart with Defaults Sensor CheckSymptom Possible Causes Corrective Action TroubleshootingTransducer Block Troubleshooting Symptom Possible Cause Corrective ActionAppendix a Reference Data Functional SpecificationsTransient Protection Update TimeAlarms Backup Link Active Scheduler LASPhysical Specifications Function Blocks Performance SpecificationsInput Ranges Sensor Option Sensor Reference 3-Wire RTDsAccuracy for Differential Configurations AccuracyAnalog Sensors 4-20mA Sensor Option Alarm Levels AccuracyAmbient Temperature Effect Top View Dimensional DrawingsAmbient Temperature Notes Examples Rosemount 848TFront View Side View Stainless Steel Junction Box-Cable Gland option code JS2Side View Front View Side View Stainless Steel Junction Box-Conduit Entry option code JS3Front View Side View Mounting OptionsAluminum/Plastic Junction Box Styles JA and JP Stainless Steel Junction Box Style JSOptions Ordering InformationEnclosure Options Standard Software Configuration StandardSpecial Temperature Test Expanded Conduit Electrical Connector StandardRosemount 848T North American Approvals Table B-2. Entity Parameters for Non Incendive Field WiringAppendix B Product Certificates Hazardous Locations CertificatesPower/Bus Canadian Standards Association CSA Certifications Special Conditions for Safe Use Power/Bus SensorEuropean Approvals Atex CertificationsCi = Li = Rosemount 848T IECEx Certifications Special Conditions of Safe UseRosemount 848T China NEPSICertifications Parameters Terminals of power/loopJapanese 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 Overview Function Blocks Appendix C Foundation fieldbus TechnologyLinkages Status InputOutput SnapTransducer Blocks Device Descriptions Block OperationInstrument- Specific Function Blocks Alerts Resource BlocksFieldbus Link Network CommunicationLink Active Scheduler LAS MID x ST Data LAS ParametersReport Distribution Backup LASAddressing Scheduled Transfers Publisher/SubscriberDevice Device Y Device Z Unscheduled TransfersSchedule Function Block Scheduling OUT Appendix D Function BlocksAnalog Input AI Function Block Number Parameter Units DescriptionIoopts AlarmhysXdscale Outscale63% of Change OUT mode in manOUT mode in auto FunctionalitySimulationIndirect Signal ConversionFiltering DirectConditions Indirect Square RootValue of the block output OUT may be set manually Table D-3. Alarm Priority LevelsManual Man Uncertain if Limited Uncertain if in Manual modeAdvanced Features BAD if LimitedHIHILIMIT, Lolimit AI Block TroubleshootingApplication Information XdblockTable D-4. Multiple Analog Input Function Block Parameters Multiple Analog Input MAI Function BlockCAPSTDDEV1 Simulate Figure D-4. Multiple Analog Input Function Block SchematicTable 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 OUT Outrange Input Selector Function BlockTable D-6. Input Selector Function Block Parameters IN1 IN2 IN3 IN4 IN5 IN6 IN7Opselect SelecttypeMingood SelectedFunctionality INn DISABLEnMode Logic Selection Alarm OUTOUT reflects the selected value Table D-8. Alarm Priority LevelsUse Uncertain as Good Block ExecutionIsel Block Troubleshooting Numerics IndexErrors Modes Automatic Configuration Errors Modes AutomaticMaintalarms Troubleshooting Alarm DetectionPage Pacific Private Limited Rosemount Inc

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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