KEYENCE BL-700 Series - Manual (Page 45)

Chapter 3 Functions for Reading Operation
31
3
■ One-shot signal trigger
The unit detects the rising edge of the trigger input and starts reading bar codes for
the preset input time. The laser beam turns off after reaching the specified decode
count and the unit sends the readout data.
The remaining actions are the same as those for level signal trigger.
1. After the trigger input exceeds the preset input times, the laser begins to emit.
Trigger input minimum ON time:
4 ms (when the trigger input value is 2 ms)
13 ms (when the trigger input value is 10 ms)
• The BL-700 can read up to 4 types of bar codes without changing the bar code type
setting (
➮ see P.61).
• For general operation, see “Level signal trigger”
Choose “One-shot signal trigger” when the trigger input signal is very short or you
want to set the input time.
• To use a one-shot trigger signal instead of trigger input, gently press the TEST switch
once (for less than 3 seconds) (
➮ see P.vi).
NOTE: The BL-700 has a built-in AGC (auto gain control) circuit. It requires a
maximum of 3 scans (4.3 ms) to adjust gain. The BL-700 generates a maximum of
4.3 ms delay until starting to read the data after the laser beam turns ON.
OK/NG NG
<Succeed to read> <Fail to read>
Trigger input
Bar code
*1
Preset input time Preset input time
Laser beams
Communication time
OK/NG output
Tips