Image - Siemens SIMATIC MV500 Operating Manual

Application
5.1 Program
5.1.3.2

Image

In this group, you enter the parameters for image acquisition.
Table 5- 10 Image
Parameter Possible values
Exposure
Auto
•
Manual
•
High sensitivity
Off
•
On
•
30
Default Description
Auto Setting the exposure control:
Auto
With this setting, each processing is preceded by a series of
image acquisitions so that the reader can set the optimum
brightness.
Position the Region of Interest (ROI exposure) of the image
so that the image area to be processed is included. Exposure
control is then based on this ROI.
To enable optimal operation of the brightness control, the
object to be processed must remain inside the ROI after the
trigger until exposure control is finished. The processing time
increases accordingly, whereby the cycle time and the high
limit of the cycle time include this increase in the processing
time.
To rule out reflections, use a limited ROI in this case.
Set a high limit for the exposure time and brightness in this
setting. Depending on your application it maybe necessary to
specify a high limit for the exposure time, for example, to
prevent excessive blurring due to movement.
The "A" button is hidden.
Manual
With this setting, you specify the exposure time and bright-
ness manually. This allows you to set the exposure according
to your own experience in conditions when the automatic
function might fail.
This setting is necessary for short image acquisition times,
for example at high reading speeds.
When you click the "A" button, you trigger a single adaption.
The reader calculates suitable values for the exposure time
and brightness. With this as a basis, you can then fine tune
the settings.
Note
If the trigger comes during the image acquisition when auto-
matic exposure control is active, it is ignored and an "N_OK"
is output.
Read the note on the use of the exposure ROI with verifica-
tion according to ISO/IEC 29158.
Off The "On" setting increases the light sensitivity by a factor of 4
compared to the "Off" setting.
This setting therefore is especially useful for applications with
high movement speeds or poor lighting conditions. The in-
creased light sensitivity causes a greater pixel noise com-
pared to normal sensitivity.
Operating Manual, 05/2019, C79000-G8976-C495-02
SIMATIC MV500