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10. Functional Description
The LF516/LF546 Electromagnetic Flowmeter is equipped with two contact output terminals (digital
output terminals (DO1, DO2)) and one external input terminal (digital input (DI), optional), enabling
you to use various functions, such as pulse output and alarm output.
The following functions are provided using the digital I/O functions are described below.
Functions Required DO, DI Outline description
Totalization
DO:1
DI:0 or 1
Totalizes the flow volume in volumetric unit.
The totalized flow volume can be output (pulse output) for each unit
of volume.
The totalizer and pulse output can be controlled (start, stop and reset)
by an external signal.
Multiple ranges
DO:1 or 2
DI:0 or 1
Multiple measuring ranges can be selected in accordance with the flow
rate. The measuring ranges can be selected either automatically or by
an external signal.
Forward and reverse ranges DO:1
Forward and reverse flows can be measured. The forward and reverse
flow measurements can be used together with multiple ranges function.
High / Low alarm
High-High / Low-Low alarm
DO:1 or 2
Outputs an alarm signal when the flow rate signal exceeds or lowers
below the preset values.
Preset counter DO:1
When the totalizer count exceeds its preset value, the converter
outputs a contact output signal.
Remote still water
zero adjustment
DI:1 Still water zero adjustment can be started by an external signal.
Remote fixed value output DI:1
Arbitrarily fixed current output and/or fixed pulse output can be used to
check a process loop circuit of output.
The fixed output mode can also be selected by an external signal.
Converter failure alarm DO:1
The converter outputs an alarm signal if an error such as memory error
or excitation circuit error occurs.
Multi-range high
/ low alarm (option)
DO:2
DI:1
Working in line with upper/lower range selection by an external signal,
high/low alarm and high-high / low-low alarm can be switched for the
flow rate signal to output an alarm signal.