GE Baker Hughes Masoneilan SVI FF Installation And Operation Manual page 114

Remote-Output (Rout)
Remote-Cascade (RCas)
Cascade (Cas)
Automatic (Auto)
Manual (Man)
Local Override (LO)
CAUTION
114 |
BHGE
The block output is set by a control application running on an inter-
face device through the remote-output-in parameter. The algorithm
is bypassed and the remote block controls its output directly. The
algorithm must initialize so that no bump is experienced when the
mode switches to Auto. A remote-output-out parameter is main-
tained by the block to support initialization of the control application
when the block mode is not remote- output. The setpoint can be
maintained or initialized to the process variable value.
The block setpoint is set by a control application running on an inter-
face device through the remote-cascade in parameter. Based on this
setpoint the normal block algorithm determines the primary output
value. A remote-cascade out parameter is maintained by the block
to support initialization of the control application when the block
mode is not remote-cascade.
A setpoint value, scheduled and published by another function block
through the Cascade input parameter, is used by the normal block
algorithm in determining the primary output value. This connection
between function blocks is defined by a link object.
A local setpoint value is used by the normal block algorithm in deter-
mining the primary output value. The local setpoint value can be
written to by an operator through an interface device.
The block output is not being calculated, although it can be limited. It
is directly set by the operator through an FF H1 interface device. The
algorithm must initialize so that no bump is experienced when the
mode switches. The setpoint can be maintained or initialized to the
process variable parameter value or to the setpoint value associated
with the previous retained target mode.
Applies to control and output blocks that support a track input
parameter. In the local override mode the block output is being set to
track the value of the track input parameter. The algorithm must ini-
tialize so that no bump is experienced when the mode switches from
LO back to the target mode. The setpoint can be maintained or ini-
tialized to the process variable parameter value.
The SVI FF Transducer block is in this mode when the device is in
setup mode from the local display.
The block is switched to TARGET mode when the local display is
switched to Normal.
Ensure before switching back that a safe operating environment exists.
© 2019 Baker Hughes, a GE company, LLC. All rights reserved.