Toshiba LF620F 用户手册

TIC-LF654L 

3 

 

Analog signal — the voltage signal from detector, 

proportional to process flow rate (for LF622 
separate type converter). 

Signal type:  20 to 30Vdc voltage signal 
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. 

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). 

4–20mAdc (load resistance 0 to 750

) 

Note: The current output cannot be used with the 

PROFIBUS-PA communication.                                  
(Refer table 6 for details) 

Digital outputs — Two points are available as 

follows. 

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) 

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 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) 

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. 

• HART (std.) — Digital signal is superimposed on 

4–20mAdc current signal as follows: 
Conforms to HART protocol 
Load resistance: 240 to 750

 

Load capacitance: 0.25µF maximum 
Load inductance: 4mH maximum 

Protocol: PROFIBUS-PA 
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 

Devices 

Function blocks: AI(Flow)×1 , Totalizer×1 

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) 

Note: This length is specification of 3 line 

connection.