Multicode Reader
O2I5xx
9
If an internal or external illumination unit is used, it will be switched on with each triggering.
4.3.1 External triggering
For external triggering of image captures, different trigger modes can be used (
Ò
software manual at
):
•
Negative edge
•
Positive edge
•
Negative and positive edge
•
Gated trigger
•
Burst trigger
During an active trigger process, no new trigger can be activated. A trigger signal that occurs
too early will be discarded and treated as a “Trigger overrun” error. The ready signal “Ready for
trigger” can be output to a switching output.
Trigger
input
Ready
1
t
t
A
t
A
0
1
0
Fig. 3: Ready signal (“Ready for trigger”)
Example: A diffuse reflection sensor as an external
trigger source triggers the unit on a positive edge (t
A
= evaluation time).
4.3.2 Internal debouncing
2
1
0
2
4
6
8 10 12 14 16 18 20
t [ms]
Fig. 4: Internal debouncing
1:
trigger input
2:
image capture
The trigger input can be debounced internally
(preset: internal debouncing deactivated). Internal
debouncing prevents several short pulses from
triggering. The pulse must be at least 4 ms long to
be recognised as a trigger.
Depending on the electrical installation, debouncing
is not necessary.
A trigger delay can be set.
4.4 Switching outputs
Switching outputs OUT1 and OUT2 are configurable. If an external illumination is connected, only
OUT1 is still available for the application.
The configuration can be set individually for each application using ifmVisionAssistant. The table
below shows the standard configuration.
Output
Standard
External illumination
Process interface
OUT1
For applications via ifmVisionAssistant:
Ready signal (“Ready for trigger”)
0: unit busy
1: unit ready for trigger signal
Selectable via com-
mand
When using the teach button:
evaluation successful (pass/fail)
