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Digital i/o functions, Toshiba – Toshiba LF494 User Manual

Page 107

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TOSHIBA

6 F 8 A 0 7 7.4,

10. Digital I/O Functions

The LI 404 converter hits one standard digital output (^>01) terminal, This terminal can be

used in various ways, such us a pulse output, or an alarm output terminal. One more digital

output (D02) and one digital input (DI) arc optionally available.

Digital I/O functions described below can be assigned for DOl, D02 and Dl.

Functions

■ ■

Description

Totalization

1

’he converter totalizes volumetric flow values.

■ The totalized flow can he output as a pulse signal (DOl only)

scaled by a user-specified factor (counting rate).

■ Ihe totalizer and pulse signal (DOl only) can be controlled

(stalls» stops and resets) with an exterrtal signal (Dl).

Multiple Ranges

■ Multiple measuring ranges can be switched according to the

process flow rales either autornatically or by an external
signal (Dl).

Forward and Reverse

flow measurements

■ Forward and reverse flow's can be measured. The forward

and reverse flow measurements can be used together with

multiple range sw'ilching function,

High and Ix)w Limit
Alarms

■ Outputs an alarm signal (DOl or D02) when the process

signal exceeds or stays below' the limit values.

Empty Pipe Alarm

■ The detector pipe must be filled with fluid all the lime.

When it is not filled with fluid, the converter outputs an
alarm signal (DOl or 1Ю2),

Totalizer Preset Point

■ When the totalized flow' reaches its preset count value, the

converter outputs a contact output signal (П01 or D02).

Remote Zero Ad­

justment

■ Zero adjustment (oii-strcam at zero flow rate) can he started

by an external signal (Dl).

luxed-value Output

Fixed current output and fixed pulse output can be used to

check a process loop circuit. An external signal (DJ) can also
be used lo control this fixedwalue output.

Converter Failure

Alarm

■ The converter outputs an alarm signal (DOl or D02) if an

error such as memory error or excitation circuit error occurs.

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