Toshiba LF600F - Manual (Page 115)

TOSHIBA 6,F,8,A0,8,6,9,
10. Digital I/O Functions
The LF60*F series electromagnetic flowmeter is equipped with two-contact-point terminals (digital
output terminals: one of them is optional), enabling you to use various functions including pulse
output and alarm output.
Digital I/O functions are described below.
Functions
Necessary DO/DI Description
Totalization
DO: 1 point
DI: None to
1 point
■ The converter totalizes volumetric flow rate.
■ The totalized volumetric flow can be output (pulse output)
for each unit flow.
■ The totalizer and pulse signal (DOl only) can be controlled
(starts, stops and resets) with an external signal (DI).
Multiple Ranges DO: 1 to
2 points
DI: None to
1 point
Multiple measuring ranges can be switched according to
the process flow rates either automatically or by an external
signal (DI).
Forward and
Reverse flow
measurements
DO: 1 point
■ Forward and reverse flows can be measured. The forward
and reverse flow measurements can be used together with
multiple range switching function.
High and Low
Limit Alarms
DO: 1 to
2 points
■ Outputs an alarm signal (DOl or D02) when the process
signal exceeds or stays below the limit values.
Totalizer Preset
Point
DO: 1 point
■ When the totalized flow exceeds its preset count value, the
converter outputs a contact output signal (DOl or D02).
Remote Zero
Adjustment
DI: 1 point
■ Zero adjustment (on-stream at zero flow rate) can be started
by an external signal (DI).
Fixed-value
Output
DI: 1 point
■ Fixed current output and fixed pulse output can be used to
check a process loop circuit. An external signal (DI) can also
be used to control this fixed-value output.
Converter
Failure Alarm DO: 1 point
■ The converter outputs an alarm signal (DOl or D02) if
an error such as memory error or excitation circuit error
occurs.
Multiple range
High/Low alarm
(option)
DO: 2 points
DI: 1 point
■ Flow rate high/low alarm and high-high/low-low alarm
are switched interlocking with the switching of high/low
range by external input signal, and output HH/LL alarm.
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