Masoneilan SVI II AP Installation and Maintenance ... - GE Energy

GE Oil and Gas
SVI II AP Instruction Manual
Fail Safe
Fatal Error
Flash Memory
FSK
Hall Effect Sensor
HART
HART
Communication
HART Filter
HART Master
HART Slave
A mode of the positioner where the valve position is controlled to
a predetermined safe position. This mode is forced by the positioner
program in response to errors. If the errors are cleared then
RESET returns the positioner to the mode prior to the error.
In error which the SVI II AP program treats as non-recoverable.
Service is required.
A computer memory that is not volatile. It stores all its data even
when the power is off. It performs high speed reads and can be
re-written many times. It is used to store programs and permanent
parameters.
Frequency Shift Keying see HART protocol.
A semiconductor magnetic-field sensor that measures the magnetic
flux perpendicular to the sensor.
HART is an acronym for Highway Addressable Remote Transducer.
The HART protocol makes use of the Bell 202 Frequency
Shift Keying (FSK) standard to superimpose digital signals at a
low level on top of the 4-20 mA. This enables two-way communication
to take place and makes it possible for additional information
beyond just the normal process variable to be communicated
tomorrow a smart field instrument. The HART protocol communicates
without interrupting the 4-20 mA signal and allows a host
application (master) to get two or more digital updates per second
from a field device. As the digital FSK signal is phase continuous,
there is no interference with the 4-20 mA signal.
The HART Communication Foundation is an independent, nonprofit
foundation corporation specifically organized to coordinate
and support the application of HART technology worldwide. Educating
the industry on the capabilities and value of this important
technology is a key role.
Operating costs are offset by membership and training⁄support
service fees. Membership is open to all suppliers, end users, and
others interested in the use of HART technology.
A filter required with certain DCS systems that are not HART
compliant. It allows the 4 - 20 mA output signal to pass from control
system to positioner, but blocks HART FSK tones from passing
from the field wiring to the control system.
A device, usually a PC which is controlling the communications
over a HART protocol network. The HART master sends to a field
device a command and requires a response.
A device, normally a transmitter or positioner, that communicates
over a HART protocol network only in response to a command
from a master.
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