20 speci?c preprogrammed FBDC functions (continued)
SFC
WAIT SFC STEP
Sets up a wait phase or step
for a PLC or a device.
Sensor
NEW GAIN
Acts as the interface between
the Crouzet pressure transmitters
and the Millenium 3 logic
controller.
NEW 5 THRESHOLDS
This function compares a value
against 5 thresholds.
MOVE SFC STEP
Sets up a move step for a
motor controlled by the PLC
to a position speci?ed on the
TARGET input.
NEW LEVEL
Calculates the level of liquid
in an open or closed tank,
with or without constant
density, using pressure sensors.
MOTOR MULTIPLEXER
Combines the motor control signals
produced by two linked MOVE SFC
steps.
NEW FLOW
Calculates the ?ow of a liquid in a
pipe using a differential pressure
element or by measuring the
dynamic pressure.
Regulation
ANALOGUE PID
Temperature control
(pressure or other) with
PID PWM
Temperature control (pressure
or other) with digital output.
Application
PUMP MANAGEMENT
Pump rotation function
analogue output.
For details of any other specific function, see pages 66-67.
7 Grafcet SFC functions
For sequential automation systems (Sequential Function Chart).
6 logic functions
5 output functions
AND, OR, NAND, NOR, XOR, NOT.
Physical outputs (relay, solid state or PWM)
and internal outputs (backlighting).
XA
17 input functions
Physical inputs (digital, potentiometer or 10-bit analogue) and internal inputs (buttons, constants).
18
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