GE Masoneilan SVI II ESD Installation And Maintenance Manual page 207

ISA
Multidrop
Multiplexer
NAMUR
Neodymium Iron Boron
Non-Volatile Memory
NORMAL Mode
PC
Position
Position Limit
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The International Society of Automation. ISA develops and publishes
international standards for use in process control. See www.isa.org.
A wiring method for HART
many smart field devices to draw power from and to communicate
over a single pair of wires. Though most suited to multiple measure-
ment devices, it can be used with SVI II ESD to permit digital commu-
nication of setpoint as well as configuration data, to multiple
positioners or a combination of positioners and measurement trans-
mitters. Such communication may not be fast enough for flow con-
trol.
Several instrument suppliers offer equipment that can be connected
to multiple cables to monitor and communicate with the attached
positioners and transmitters using the HART
multiplexer is used with a DCS that does not support HART
NAMUR is a European user association of process control technol-
ogy in chemical and pharmaceutical industries. Recommendations
and Worksheets are experience reports and working documents pre-
pared by NAMUR for its members among process control users for
facultative utilization. NAMUR issued a recommended accessory
mounting for control valves (NE 14 Anschluß von Schwenkantrieben
an Armaturen 06.08.96) which describes a method for mounting a
positioner on an actuator. See at www.namur.de.
A magnet alloy which provides the highest energy magnetism avail-
able in a permanent magnet.
Computer memory whose data is not lost when power is turned off.
Used to permanently store calibration, configuration and diagnostic
information in SVI II ESD.
The control mode for normal use of a valve positioner. The positioner
receives a setpoint from a controller or DCS and applies pressure to
the actuator to move the valve to the required position.
As used in this manual, a personal computer or laptop running
under Windows 2000 or later operating system.
With a reciprocating valve, position is the distance of plug from its
seat, normally measured as a linear motion of the valve or actuator
stem. With a rotary valve, position is the angle of rotation of valve
plug measured as angular rotation of the valve shaft.
The actuator can be mechanically set to stop at a predetermined
position by setting an adjustment, sometimes with a handwheel or
screw stop. SVI II ESD can be configured to provide the same limits
through position software control.
Masoneilan SVI II ESD Installation and Maintenance Manual
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Communications Protocol that allows
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protocol. Often the
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