KEYENCE BL-600 Series User Manual

Page 97

Chapter 6 Functions for Reading Operation

Note: 5 seconds after the power switch turns on or an UNLOCK command

(

➮

See

page 116.)

is sent, the unit will not start reading a bar code by turning on the trigger

input.

One-shot signal trigger

The BL-600 Series detects when the trigger input turns on and starts reading bar
codes for the preset “One shot input time”.

➮ See page 44.

The laser turns off after the

number of the bar code reading reaches the specified decoding match count.

➮ See page 43.

The BL-600 Series then sends the read data.

The rest of the operation is the same as that for the “Level signal” method.
Use the one-shot signal trigger when the one shot input time is extremely short or
to fix the scanning time.

Reference 1: The BL-600 can read up to 4 types of bar codes without changing
the bar code type setting.

➮ See page 49.

Reference 2: Pressing the TEST switch lightly (for less than 2 seconds) serves as
a trigger input (The laser turns on once.).

➮ See page 8.

■ Timing diagram

*1 After the trigger input exceeds the preset input times, the laser begins to emit.

Trigger input minimum ON time:

5 ms (when the trigger input value is 2 ms)
15 ms (when the trigger input value is 10 ms)

Note: The BL-600 has a built-in AGC (auto gain control) circuit. It requires a
maximum of 3 scans (6 ms) to adjust gain. The BL-600 generates a maximum of 6
ms delay until starting to read the data after the laser beam turns ON.

OK/NG

Trigger input

Bar code

Preset input time

Laser beams

Communication time

OK/NG output