Toshiba GF630 Manual page 3

Model LF620 and LF622 converters
Input signals
Analog signal — the voltage signal from detector,
proportional to process flow rate (for LF622
separate type converter).
Digital input DI
Signal type: 20 to 30Vdc voltage signal
Input resistance: 2.7kΩ
Number of inputs: one point
Note: DI cannot be used with the Modbus
communication.
DI function — One of the following functions
can be assigned to the DI signal.
Range switching — Selects either the higher or
lower range in the unidirectional or
bidirectional 2-range setting.
Totalizer control — Starts and stops the built-in
totalizer.
Fixed-value outputs —Outputs fixed-values for
current and pulse outputs.
Zero adjustment — Executes zero adjustment
(on-stream at zero flow rate).
Output signals
Current output:
4–20mAdc (load resistance 0 to 750Ω)
Note: The current output cannot be used with
the PROFIBUS-PA ccommunication.
Digital outputs — Two points are available as
follows.
Digital output DO1 :
Output type: Transistor open collector
Number of outputs: One point
Output capacity: 30Vdc, 200mA maximum
Note: DO1 cannot be used if Modbus
communication connection is 3 lines.
Digital output DO2 :
Output type: Solid-state relay output (non
polarity)
Number of outputs: One point
Output capacity: 150Vdc, 150mA maximum or
150Vac (peak to peak), 100mA maximum
Note: DO2 cannot be used with the Modbus
communication.
GF630/LF620 GF632/LF622
DO1 and DO2 functions — One of the following
functions can be assigned to DO1 and/or DO2.
• Pulse output (available only for DO1,DO2)
Pulse rate: Max 10kHz (10,000pps) (DO1)
Max 100Hz (
(Over 1kpps, auto-setting)
Pulse width: 0.3 to 500ms (but less than half of
the period for 100% flow rate)
Note: The same and simultaneous pulse is not
available between DO1 and DO2.)
• Multi-range selection outputs (Note 1)
• High, High high, Low, and/or Low low alarm
outputs (Note 2)
• Empty pipe alarm output (Note 2)
• Digital Output Active Status (DO1 and DO2)
(Note 2)
• Preset count output
• Converter failure alarm output
Note 1: Two outputs (DO1 and DO2) are needed
for 4-range switching and forward/reverse
2-range switching.
Note 2: Normal Open (default set) or Normal
Close is selected for alarm outputs when
programming.
When power failure occurs, unit will be fault to
Normal Open.
100pps) (DO2)
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