Omron V500-R521B2 User Manual page 43

Section 3
Function Explanation
Concept of moving direction/line speed
When reading a moving bar code, fully investigate from the following viewpoint.
Confirmation of the timing chart
Duration from the reading trigger and outputting the data of actual reading differs
according to condition.
Operation Flow Chart p.38
Confirmation of trigger input timing
When constructing the system to read the moving bar code, input timing of the external
trigger signal is important. Input the external trigger signal allowing enough timing
considering the moving speed (moving distance) of the bar code.
Photoelectronic
sensor
Checking the tack timing
In case when bar codes come continuously, calculate how close the bar codes may
come, considering above two points.
V500-R521B2/C2
44
User's Manual
When the timing is too slow...
The bar code is already
passed and cannot read.