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6.3 Trigger Input
6.3.1 Active Trigger Edge
The trigger input port accepts rising edge signal or falling edge signal. The default setting
is rising edge signal.
6.3.2 Input Signal Glitch Filter
The input signal glitch filter function is disabled by default.
If this function is enabled, when the first trigger signal edge is received, system will
double checks after the glitch filter delay time. Only when two results (before and after
glitch filter delay time) are the same can the input trigger be accepted. For general digital
sensors, this function is not recommended. However, for input trigger from mechanical
switch, this function is very useful to avoid spurious triggering.
6.3.3 Trigger Delay
The time period between trigger signal input and image exposure starting is called
triggering delay.
6.3.4 Delayed Triggering
For some machine vision applications, the triggering sensor is far from the camera,
between which there are several components moving on production lines. In this case,
delayed triggering function is necessary. EyeCheck 5xxx camera supports up to 32 delayed
instances, each instance can be delayed up to 60 seconds, time precision: 1 microsecond.
6.4 General input
6.4.1 Active Triggering Edge
The trigger input port accepts rising edge signal or falling edge signal. The default active
edge is rising edge. It is recommended to use PNP output type sensors, switches or PLC,
because they can direct interface with the trigger port.
6.4.2 Input Signal Glitch Filter
The input signal glitch filter function is disabled by default. If this function is enabled,
when the first trigger signal edge is received, system will double checks after the glitch
filter delay time. Only when two results (before and after glitch filter delay time) are the
same can the input signal be accepted. For general digital sensors, this function is not
recommended. However, for input trigger from mechanical switch, this function is very
useful to avoid malfunction. The glitch filter delay time should be set according to the field
tests.
6.4.3 Input Delay
The time period between general input and user's program receiving message is called
input delay. This input delay time may be variable because of OS thread scheduling and
user programming style, usually range from 0.1ms to 1ms.
EVT
GmbH, Haid-und-Neu-Str. 7, 76131 Karlsruhe, Germany
www.evt-web.com,
info@evt-web.com
Tel.: 0049 721 668 004 23 0
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