KROHNE IFC 020 Converter EN - Manual (Page 76)

Installation and operating instructions IFC 020 12/1
12 Block diagram – signal converter
1 Input amplifier
n overdrive-proof signal processing,
rapid and accurate
n digital signal processing and sequence
control
n patented, high-resolution A/D converter,
digitally controlled and monitored
n high signal-to-noise ratio through low-
loss field power supply
2 Field power supply
n the low-loss field power supply
generates the pulsed, electronically
controlled DC current for the magnetic
coils of the primary head
n the low-loss regulator reduces the power
take-off
n high field current causes a high signal
level.
3 Current output
n galvanically isolated from all other
groups
n converts the digital output signal from the
µ P 3 microprocessor into a proportional
current
n HART ® and RS 485-interfaces,
switchable
4 Binary outputs
n galvanically isolated from other groups
n selectable input/output combinations
n pulse output, passive FET optocouplers
allow connection
of electronic and electromechanical
totalizers
n status output, for limit value, error
identification, or flow direction
in forward/reverse flow mode (F/R)
5 Display/operator control unit
n large-size illuminated LC display
n 3 keys for operator control of the signal
converter
n connection to the internal IMoCom bus
6 IMoCom bus plug connector
n for connection of external control and
test devices
7 External control input (IFC 020 E only)
n reset of internal totalizer
n zero setting of all outputs
The standard
n high accuracy
n practice oriented standard equipment
n current and pule output (galvanically
isolated)
n status output, adjustable for many tasks:
indicators for trip point, flow direction and
errors.
n IMoCom-Bus suitable for many in- and
external tasks
n simple, uniform KROHNE control outline
n very lowpower consumption
n HART ® and RS 485-interfaces