GE Baker Hughes Masoneilan SVI FF, Installation And Operation Manual

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Masoneilan SVI FF Instruction Manual =
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Appendix B. About Fieldbus
Outline
Fieldbus is a bi-directional digital communication protocol for field devices, which offers an
advancement in technologies for process control systems and is widely employed by numerous
field devices.
SVI FF employs the specification standardized by The Fieldbus Foundation, and provides
interoperability between Masoneilan devices and those produced by other manufacturers.
Fieldbus comes with software consisting of AO function block, two DI function blocks and
optional PID function block and a selection of other blocks as necessary, providing the means to
implement a flexible instrumentation system.
For more general information on other features, engineering, design, construction work, startup
and maintenance of Fieldbus, refer to
Fieldbus Technical Information (TI 38K3A01-01E).
Internal Structure of SVI FF
The SVI FF contains two virtual field devices (VFD) with the following functions.
System/
Network
Management
VFD Sets node addresses and Physical Device tags (PD Tag) necessary for
communication.
Controls the scheduling and execution of function blocks.
Manages block parameters, block-to-block signal propagation and
communication resources (Virtual Communication Relationship: VCR).
Function Block
VFD Resource block - Manages the information common to each FB VFD in SVI
FF.
Transducer block - Operates as the intermediary between Hardware I/O
(actuator, sensor) and AO/DI function blocks; passes the control signal
from AO function block to I/P module to control the valve position.
AO block - Accepts a:
Control signal from an upstream block and pass the signal to
Transducer block.