GENERAL
Model LFS1500, Control Function for Basic Field Control
Unit (for FIO, for Vnet/IP), is installed and runs in
any of the following FCS models: AFV10S, AFV10D
Moreover, the number of the connectable node units
and the application capacity can be expanded if
LFS1530 Application Capacity Expansion Package (for
AFV10) is purchased in addition to control Function
for Basic Field Control Unit.
FUNCTION SPECIFICATIONS
Structure of Control Functions
The basic control functions are implemented as a twolevel
hierarchy, described below. Such a hierarchical
model facilitates engineering and modification/addition
of functions.
Function Blocks
These are the smallest elements used to perform
control and calculation, and are at the bottom of the
hierarchy.
Control Drawing
A control drawing represents the control instruments
responsible for overall control of a small section of the
plant, and typically contains several function blocks.
A control drawing may be used to implement cascade
control or combustion fuel/air ratio control, for example.
Function Blocks
The function blocks are divided into regulatory and
sequence control blocks, calculation blocks, faceplate
blocks and unit instruments. These function blocks
may be combined to configure a control drawing.
Regulatory Control Blocks
These function blocks are mainly used for feedback
control.
Input Indicator Blocks: Input indicator, Input indicator
with deviation alarm
Controller Blocks: PID controller, Sampling PI controller,
PID controller with batch switch,
Two-/Three-position ON/OFF controllers,
Time-proportioning ON/OFF controller,
PD controller with manual reset, Blending
PI controller, Self-tuning PID controller
Manual Loader Blocks: Manual loader, Manual
loader with input indicator, Manual loader
with Auto/Man SW, Two-/Three-position
motor control
Signal Setter Blocks: Ratio set, 13-zone program
set, Flow-totalizing batch set, Weight-totalizing
batch set
Signal Limiter Block: Velocity limiter
Signal Selector Blocks: Autoselector, Signal selector,
Dual-redundant signal selector
Signal Distributor Blocks: Cascade signal distributor,
Feedforward signal summing, Non-interference
control output, Control signal
splitter
Pulse Count Input Block: Pulse count input
YS Instrument Blocks: YS controller, YS programmable
controller, YS programmable controller
with pulse-width output, YS manual
station with SV output, YS manual station
with MV output lever, YS ratio set station,
YS batch set station, YS blending controller,
YS batch controller, YS totalizer
