KEYENCE BL-700 Series - Manual (Page 47)

Chapter 3 Functions for Reading Operation
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3.2 Read Modes
The BL-700 provides 4 types of read modes.
3.2.1 Single label read mode
This mode allows the unit to read one bar code during one trigger input signal. The
operation and timing chart are described on page 30 to 32.
3.2.2 Multi-label read mode 1 (Multi 1)
This mode allows the unit to read several bar codes printed on one label as shown
below during one trigger input signal. The unit outputs the readout data sequen-
tially.
Multi-label read mode 1 operation
• In the multi-label read mode 1, the unit reads several bar codes continuously,
and outputs them sequentially as it reads while laser beam remains on and
trigger input turns on after bar codes have been read (or during the preset input
time if one-shot signal trigger is selected).
• To prevent the unit from reading the same bar code twice, the time for one bar
code to pass across the laser beam’s field and read, plus the repeat reading
time must be set (100 ms to 25.5 s). During the repeat reading time, the unit
cannot read the same bar code repeatedly, but can read different bar codes.
• A reading error is issued only when the unit cannot read any bar code while the
trigger input is on.
• For OK/NG output, “OK” turns on every time the unit reads a bar code and “NG”
turns on if the unit fails to read a bar code. (Comparison to the preset data is not
performed.)
LASER ON
STB OK/NG TIMING
TEST BL-700
Repeat reading time
OK NG
Trigger input
Bar code
Laser beams
Communication time
OK/NG output
OK OK OK