2 Fieldbus Basics
Transcript of 2 Fieldbus Basics
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2 Vietnam FF Seminar18 Mar 2010
1. H1 Basic Review.
2. H1 Benefits.
3. FOUNDATION Fieldbus Terminologies.
Fieldbus Basics - Agenda
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H1 Basic ReviewH1 Basic Review
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What is Fieldbus?1. A fieldbus is an all-digital, serial two-way, multi-drop communication System.
2. H1 link (31.25kbps) interconnects field equipment (Sensors, Actuators & I/O).
3. HSE (High Speed Ethernet, 100mbps) provides integration of high speedcontrollers, subsystems (via Linking Device) and data servers andworkstation.
BusinessEnterprise
H1 andHSE
H1-Fieldbus Network
HSE
Data Servers
MIS
ERPHMI
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H1 BenefitsH1 Benefits
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More data is available1. Fieldbus allows multiple variables from each device to be brought into the
control system for archiving, trend analysis, process optimization, reporting,predictive maintenance and for asset management.
2. Fieldbus distortion-free characteristics digital communication enablesimproved control capability which can improve product yields.
Traditional 4-20mA One Variable (One Direction)
PV
Control System Network
4-20mA
Control system network
H1
Fieldbus Multiple Variables (Both Directions)
Analog Controller Fieldbus Controller
PV , Mode , Variables , AlarmDiagnostics , Etc
I/O Subsystem
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Expanded View of Process & Instrument1. Self Diagnostics and communication capabilities of microprocessor based
fieldbus devices helps reduce downtime and improve plant safety.
2. Plant operation and Maintenance personnel can be notified and corrective
actions taken quickly and safely.
Fieldbus Extends View to Field InstrumentTraditional 4-20mA View stops at I/O Subsystem
PV
Control System Network
4-20mA
Control System Network
H1
Analog Controller Fieldbus Controller
PV , Mode , Variables , AlarmDiagnostics , Etc
I/O Subsystem
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Reduction in System Hardware1. Each H1 interface card can typically connect up to 4 segments.
2. Many control system functions such as AI, PID and AO can be performed bythe field device through the use of these Standard Function Blocks.
3. Distribution of control into field devices can reduce the amount of hardwareneeded, decrease CPU loadings and enable faster loop executions.
Fieldbus Extends Control and I/O to Field InstrumentTraditional Control and I/O requires extra hardware
Control System Network
PID
AI AO
PV
4-20mA
Analog Controller
I/O Subsystem
Control System Network
H1
Fieldbus Controller
PV , Mode , Variables , AlarmDiagnostics , Etc
AI AO PID
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Wiring Savings1. The H1 fieldbus allows many devices to be connected to a single wire pair.
2. This results in less wire, fewer intrinsic safety barriers and fewer marshalingcabinets.
One I.S Barrier, One Wire for Many DevicesTraditional 4-20mA wiring, One I.S Barrier,One wiring for each Device
I.S
PV
Control System Network
4-20mA
Control System Network
H1
Analog Controller Fieldbus Controller
PV , Mode , Variables , AlarmDiagnostics , Etc
I/O Subsystem
I.SI.SI.SI.S I.S
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Summary1. Reduced number (or size) of :
a. wires and marshaling panels.b. intrinsic safety barriers.
c. Input/Output Converters.d. Power Supplies and Cabinets.e. equipment Rooms.
2. Remote configuration of devices.
3. More information available for Operations and Maintenance, due to moreinformation coming from sophisticated devices. Device diagnostics enablepredictive maintenance programs.
4. Control in the field due to standardized function blocks.
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FOUNDATIONFOUNDATION fieldbusfieldbus
TerminologiesTerminologies
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H1 Network Review
H1Digital Signal
1900 meters
1. Multi-Drop wire pair with Power and Signal on same cable.
2. Support Intrinsic Safety.
3. Fault Tolerant, can have multiple Link Masters.
4. Function Blocks built into Field Devices.
5. Control on the Wire single loop integrity
6. Distance up to 1900 meters.
7. Can add Repeaters toextend > 1900 meters.
8. Max. of 4 repeaters can
be used to a maximum
distance of 9500 meters.
R
Distance > 1900 meters
H1 Digital Signal
Fieldbus Signal
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Intrinsic Safety
Control room Field
T
Trunk
Wiring block
Field device
Powersupply
HostControl
System
Conditioner T
I.S Interface
I.S certified devices
I.S certified devices
Entity, FISCO, FNICO, High Power Trunk
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DD and CFF Files
ConfigurationSystem
H1 Network
1. Device supplier provide devices togetherwith
Device Description (DD).
Common File Format (CFF).
2. Device Descriptor (DD) File allowoperation
of devices from different suppliers on the
same fieldbus with single host system.
3. Common File Format (CFF) is a file which
describes the functions and capabilities of afield device. The CFF file is used in
conjunction with the Device Descriptor file toenable a host system to perform offline
engineering without the devices.
DD & CFF
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Typical Fieldbus Installation
PCPowersupply
T
PCPowersupply
T
24V DCBulk power
An example of the
Chicken foot (tree)topology.
Redundant, isolatedpower conditioningdefined by FF-831 specs.
Typically 10-12 bus-powered fieldbus devicesper segment.
Spur short-circuitprotection.
TrunkSpur
Segment
Field
Devices
Control System (Host)Fieldbus Interface Module
FFFF--831831
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Fieldbus Component
WorkstationWorkstation HMIHMI
TerminatorTerminator
Power SupplyPower Supply
Junction BoxJunction Box
H1 Bus Wire (Spurs)H1 Bus Wire (Spurs)
HSE CableHSE CableConditionerConditioner
Actuator ValveActuator Valve
Fieldbus Interface ModuleFieldbus Interface Module
TerminatorTerminator
H1 Bus (Trunk)H1 Bus (Trunk) Hazardous Area (Field)
Safe Area (Host)
FOUNDATIONFOUNDATION FieldbusFieldbus SystemSystem
Fieldbus Controller
AnalyzerAnalyzerTransmittersTransmitters
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H1 Fieldbus ModelFOUNDATION fieldbus H1 technology consists of:
The Physical Layer. The Communication Stack.
The User Application Layer.
The Open Systems Interconnect(OSI) layered communication model
is used to model these components.
Physical Layer is OSI layer 1. Data Link Layer is OSI layer 2.
FMS is OSI layer 7. Communication stack is comprised
of layer 2 and layer 7.
Fieldbus does not use OSI layer3, 4, 5 and 6.
FAS maps the FMS into DLL.
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1. The Physical Layer receives messages from the communication stack andconverts the messages into physical signals on the fieldbus transmissionmedium and vice versa.
2. Conversion includes adding and removing preambles, start delimiters andend delimiters.
H1 Fieldbus Model
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1. The Communication Stack comprises of Layer 2 and 7.
2. The Data Link Layer (DLL) controls transmission of messages onto thefieldbus, through a deterministic centralized bus scheduler call the Link Active
Scheduler (LAS).
3. FAS uses the scheduled andunscheduled features of the DLL to
provide a service for the FMS.
3. FMS services allow user applicationsto send messages to each other
across the fieldbus using a standardset of messages.
H1 Fieldbus Model
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User Application - Blocks1. The Fieldbus Foundation has defined a standard User Application Layer
based on Blocks.
2. Blocks are representations of different types of application functions.
3. The types of blocks used in a User Application are described as:
Resource Block,
Transducer Block, Function Blocks.
4. Devices are configured using
Resource Block and Transducer Block.
5. The Control Strategy is built usingFunction Blocks.
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Resource Block1. The Resource Block describes characteristics of the fieldbus device such as
device name, manufacturer and serial number, etc.
2. There is only one Resource Block in a device.
H1Interface
Device
Device
Resourceblock
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Transducer Block1. Transducer Blocks are used to configure devices.
2. Transducer Blocks are required to Read sensors value and command output
value.
H1Interface
Device
Device
Transducer block
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Function Blocks1. The Control System Strategy is built using Function Blocks. Input and output
parameters of Function Blocks can be linked over the fieldbus.
2. The execution of each Function Blocks is precisely scheduled and there can
be many function blocks in a single user application.
AI Block
PID Block
AO Block
PID
AI
AO
H1 Fieldbus
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Standard Function Blocks
Function BlocksFunction Blocks AbbreviationAbbreviation Class TypeClass TypeAnalog Input AI Input
Analog Output AO Output
Bias/Gain BG Control
Control Selector CS Control
Discrete Input DI Input
Discrete Output DO Output
Manual Loader ML Control
Proportional/Derivative PD Control
Proportional/Integral/Derivative PID Control
Ratio RA Control
1. The Fieldbus Foundation has defined 10 Standard Function Blocks for BasicControl.
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Standard Function Blocks
Function BlocksFunction Blocks AbbreviationAbbreviation Class TypeClass Type
Device Control DC Control
Output Splitter OS Control
Signal Characterizer SC Control
Lead Lag LL Control
Deadtime DT Control
Integrator (Totalizer) IT Control
Setpoint Ramp Generator SPG Control
Input Selector IS ControlArithmetic AR Control
Timer TMR Control
Analog Alarm AAL Control
2. These are some of the other Standard Function Blocks available for ComplexControl.
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H1 Link Active Scheduler1. LAS provides scheduled(*) and unscheduled communication(**) control on
the H1 network.
2. LAS maintain a live list (devices that response to the pass token) which ituses to recognize devices on each H1 Link.
3. Provides Data Link Time Synchronization so that all devices have exactly thesame data link time.
4. Facilitates LAS Backup or LAS Redundancy. If one LAS fails, one of the LinkMaster will become the LAS and operation continues.
(*) Sends a compel data (CD) message to a device which allows the device to publish specific data when itreceives the CD message.
(**) Issues a pass token to a device which allows the device to send message until it has finished or the token hold
time expires.
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H1 Link Master Redundancy1. Two types of devices are defined in the Data Link Layer (DLL).
Link Master and Basic Device.
2. Link Master Device are capable of becoming
Link Active Scheduler (LAS). Basic Devicedo not have this capability.
BKUP LAS
PRIM LAS
BASIC Device
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H1 Link Active Scheduler
AI 110
Scheduled Unscheduled
Closed loop control Alarms/EventsMaintenance/Diagnostic InformationProgram InvocationPermissives/InterlocksDisplay InformationTrend InformationConfiguration
loop 110 period of execution
PID 110
AO 110
Function Block Execution
Scheduled Communication
Unscheduled Communication
Function blocks:
1. PID Loop scheduled and unscheduled communication.
Device 1
Device 2
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An Example - Triple Transmitters (Un-optimized)
Optimizing Fieldbus Link Schedules Makes a Difference!
AI1
AI1-[OUT]
AI2
AI2-[OUT]
AI3
Macrocycle Time
AI3-[OUT]
ISEL
PID2-[OUT]
AO
AI1
AI2
AI3
ISel PID AO
Link Schedule Optimization
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AI1
AI2
AI3
ISel PID AO
AI1
AI1-[OUT]
AI2
AI2-[OUT]
AI3
Macrocycle Time
AI3-[OUT]
ISEL
PID2-[OUT]
AO
More uninterrupted
communications intervals.
Better unscheduled throughput. Faster display call-ups, etc.
Reduced latency.
Link Schedule OptimizationOptimizing Fieldbus Link Schedules Makes a Difference!
An Example - Triple Transmitters (Optimized)
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HIGH SPEED ETHERNET
(HSE)
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High Performance Control BackboneStandard Ethernet Equipment and Wiring
Standard Function Blocks PLUSFlexible Function Blocks for Discrete/Batch/PLC
Redundant HSE Interfaces and DevicesLinking Devices (LD) Integrate H1
HSE Provides the Open Interface for Data Servers
HSE High Speed Control and
Integration Backbone
APPLICATIONPACKAGES
MIS
P
L
P
L
P
L
P
L
FF Integrated Architecture
HSE Subsystem Integration
Data Servers
LDLD
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H1P
L
Plant
P
L
Plant
P
L
Plant
H1 H1
HSE Client
100 Mbit/sSwitch
LinkingDeviceHSE
Field Device
Gateway
I/O Network
High Speed Ethernet Devices
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H1P
L
Plant
P
L
Plant
P
L
Plant
H1 H1
HSE Client
LinkingDevice
HSEField Device
Gateway
I/O Network
HSE - LAN Redundancy
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H1P
L
Plant
P
L
Plant
P
L
Plant
H1 H1
HSE Client
LinkingDeviceHSE
Field Device
Gateway
I/O Network
HSE - Device Redundancy
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Thank you
www.fieldbus.org