Toshiba LF654 Manuale Utente
TIC-LF654L
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).
separate type converter).
Digital input DI
Signal type: 20 to 30Vdc voltage signal
Input resistance: 2.7k
Input resistance: 2.7k
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.
2-range setting.
Totalizer control — ‘Starts and stops’ or ‘Rest and
start’ the built-in totalizer.
Fixed-value outputs —Outputs fixed-values for
current and pulse outputs for loop check.
Zero adjustment — Executes zero adjustment
(on-stream at zero flow rate).
Output signals
Current output:
4–20mAdc (load resistance 0 to 750
)
Note: The current output cannot be used with the
PROFIBUS-PA communication.
(Refer table 6 for details)
(Refer table 6 for details)
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.
(Refer table 6 for details)
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. (Refer table 6 for details)
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 output (available only for DO1, DO2)
Pulse rate: MAX 10kHz (10000pps)(DO1)
MAX 100Hz (100pps)(DO2)
(Over 1kpps, auto-setting)
Pulse width: 0.5 to 500ms (but less than half of
the period for 100% flow rate)
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)
• 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.
When power failure occurs, unit will be fault to Normal
Open.
Communications output:
• HART (std.) — Digital signal is superimposed on
4–20mAdc current signal as follows:
Conforms to HART protocol
Load resistance: 240 to 750
Conforms to HART protocol
Load resistance: 240 to 750
Load capacitance: 0.25µF maximum
Load inductance: 4mH maximum
Load inductance: 4mH maximum
• PROFIBUS (opt.)
Protocol: PROFIBUS-PA
Baud rate: 31.25kbps
Bus voltage: 9-30VDC
Baud rate: 31.25kbps
Bus voltage: 9-30VDC
Consumption electric current of bus: less than 16mA
Manufacture Ident-No.: 093B
HEX
Standard Ident-No.: 9740
HEX
Slave address: 0-126 (Default address is 126)
Profile: Profile Ver.3.01 for Process Control
Profile: Profile Ver.3.01 for Process Control
Devices
Function blocks: AI(Flow)×1 , Totalizer×1
• MODBUS (opt.)
Physical layer : RS485
Protocol : Modbus
Mode : RTU
Baudrate : 4800, 9600, 19200bps
Data length : 8bit
Parity bit : None, Odd, Even
Stop bit : 1bit, 2bit
Error check : CRC-16
Max. station number : 32(with Master device)
Max. cable length : 1.2km (Note)
Protocol : Modbus
Mode : RTU
Baudrate : 4800, 9600, 19200bps
Data length : 8bit
Parity bit : None, Odd, Even
Stop bit : 1bit, 2bit
Error check : CRC-16
Max. station number : 32(with Master device)
Max. cable length : 1.2km (Note)
Note: This length is specification of 3 line
connection.