Toshiba LF654, LF620F specifications  Model LF620 and LF622 converters

TIC-LF654L

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’ 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 750Ω)

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.

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 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.

Communications output:

•HART (std.) — Digital signal is superimposed on 4–20mAdc current signal as follows:

Conforms to HART protocol Load resistance: 240 to 750Ω Load capacitance: 0.25µF maximum Load inductance: 4mH maximum

•PROFIBUS (opt.)

Protocol: PROFIBUS-PA

Baud rate: 31.25kbps

Bus voltage: 9-30VDC

Consumption electric current of bus: less than 16mA

Manufacture Ident-No.: 093BHEX

Standard Ident-No.: 9740HEX

Slave address: 0-126 (Default address is 126)

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)

Note: This length is specification of 3 line connection.

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