1. Introduction to FOUNDATIONTM
FIELDBUS (FF)
By Rajesh S
March 16th 2012 Friday
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2. FOUNDATION FIELDBUS
 Two-way digital communications system
designed for interconnecting smart field
devices and control systems.
 Control/Monitoring functions on field mounted
devices.
 High speed
 H1 – 31.25 Kbit/s
 HSE – 100 Mbit/s
 By Fieldbus Foundation
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3. HART Vs Fieldbus
HART
 Uses 4-20mA signal. Speed - 1200 bps
 Ability to provide diagnostics for the device only , has no
knowledge of other devices
 Poll - HART status periodically
 Multidrop – 15 devices but slow.
Field bus:
 Advanced diagnostics - Eg: Process Monitoring and
Machinery Health monitoring.
 Push - with events latched and time stamped in the device
and sent to device.
 True multidrop – 32 devices
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4. Advantages of Fieldbus
Foundation
 Interoperability with other Field bus device.
 High speed
 Advanced Diagnostics
Types
 H1 – 31.25 Kbit/s – interconnects “field”
equipment such as sensors, actuators and
I/O.
 HSE – 100 Mbit/s – High speed Ethernet –
provides integration of high speed controllers.
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5. OSI Model Vs Fieldbus Model
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6. Fieldbus Model
User Layer:
• Function Blocks
• Network Management (NM)
• System Management (SM)
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7. Fieldbus Model
 Application Layer:
 Fieldbus Message Specification (FMS) – Message
structure
 Fieldbus Access Sub layer – provides virtual
communication channel , Addresses.
 Data Link Layer
 Error coding, parity checking.
• Physical Layer
 Wiring.
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8. HSE Device Types
 Linking device – Links H1 networks to the HSE
network.
 Ethernet device – Execute function blocks and
may have some conventional I/O.
 Host device - an operator workstation or an OPC
server.
 Gateway device (GD) - interfaces other network
protocols such as Modbus, Device Net or
Profibus
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9. HSE Device
 FDA Agent
 HSE System Management Kernel
(SMK)
 HSE Network Management Agent
(NMA)
 Virtual Field Device (VFD)
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10. Field Device Access (FDA)
 Convey SM services over UDP
 FMS Services over UDP/TCP
 Allows HSE and H1 field devices, conventional
I/O devices, and non-FF I/O devices to be
connected to the HSE through a linking or a
gateway device.
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11. HSE System Management
 Integrates devices on an HSE network into a
coherent communication system
 Unique, permanent identity for device
 Maintains version control
 Function block schedules
 Devices added/removed without affecting other
devices
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12. HSE Network Management
 HSE host systems to conduct management
operations over the HSE network with their
associated devices with an HSE interface.
 Configuring the H1 Bridge
 Loading the HSE Session List
 HSE Session Endpoint – Logical communication channel
 Loading the HSE VCR List – communication
relationship used to access VFDs.
 Fault Detection Monitoring.
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13. FDA Components
 FDA Session
 An application relationship used for request/response,
publisher/subscriber.
 Identified by their source and destination endpoint
addresses (IP addresses plus UDP/TCP port numbers)
 FDA Agent
 Entity within an HSE Device - uses the services provide
HSE access to VFDs and SMKs (Within HSE device or
other H1 devices)
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14. FDA Agent
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15. Application Processes (AP)
 Application Processes (AP)
 Entities within devices that perform a related set of
functions, such as function block
processing, network management, and system
management
Function Block Application Processes (FBAP)
 Automated manufacturing and process control
systems perform a variety of functions
 Range of functional models, each addressing a
different need.
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16. Virtual Field Devices (VFDs)
 Network visible objects of an Application Process
 Descriptions of network visible objects are
contained within the Object Dictionary (OD)
within the VFD.
 OD :
 composed of a series of entries, each describing an
individual object and its attributes.
 OD entries are assigned an index which is used to
obtain the description of the object from the OD.
The OD index is also used to access the object
itself. For each VFD there is exactly one Object
Dictionary.
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17. Virtual Field Devices (VFDs)
 Virtual Communication Relationships
 Network visible objects are accessible through
VCRs using FMS Services
 Communication relationship to access VFDs
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18. Few SM and FMS services
 SM Device Annunciation and
Assignment
 SM Device Identification Header
 SM Tag Query Service-Specific Parameters + User Data
(optional)
 FDA Open Session Trailer (optional)
 FMS Initiate
 FMS Abort
 FMS GetOD
 LAN Redundancy Get information
 LAN Redundancy Put information
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19. More on Next Session…
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20. Thank You
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