Technical Specifications

ValVueFF Software Interface to FVP
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GE Energy
Quick Opening (see Characteristic)
RB Resource Block
RCAS Remote Cascade mode
Relay, Pneumatic The component which amplifies the pneumatic control signals to
provide a wide range of actuation pressure and to supply and
vent at high flow rates for responsive control.
Resource Block (RB) This describes fieldbus device characteristics, such as the device
name, manufacturer and serial number. There is only one
Resource Block (RB) in a device.
ROUT Remote output mode
Safe Area The area of a plant where there never is an explosion hazard
present, such as the control room or a wire marshalling rack area.
Schedules This defines when Function Blocks (FBs) execute and when data
and status is published on the bus.
Segment This is a section of an H1 fieldbus that is terminated in its charac-
teristic impedance.
Segments can be linked by Repeaters to form a longer H1 field-
bus. Each Segment can include up to 32 H1 devices.
Single Acting The action of a position with a single pneumatic output for opera-
tion with a spring return actuator. (see double acting).
SMIB System Management Information Base
Splice This is an H1 spur measuring less than 1 m (3.28 ft.) in length.
Split Range A control configuration in which a single control output is sent to
two or more control valves. Each control valve positioner is cali-
brated to respond to a separate portion of the control signal. For
example, a steam valve and a cooling water valve arranged to be
both closed at 50% and the steam valve to open
Spur This is an H1 branch line connecting to the trunk that is a final cir-
cuit. A spur can vary in length from 1 m (3.28’) to 120 m (394’).
Standard Function
Block (FB)
These are built into fieldbus devices to achieve the desired con-
trol functionality. Automation functions provided by Standard FBs
include Analog Input (AI), Analog Output (AO) and Proportional/
Integral/Derivative (PID) control. The Fieldbus Foundation has
released specifications for 21 types of Standard FBs. There can
be many types of FBs in a device. The order and definition of
Standard FB parameters are fixed and defined by the specifica-
tions.