Normalizing And Live Image; Live Image (Monitor); Signal Normalizing And Autoblanking; Info - Balluff Light Array BLA 50A-001-S115 Betriebsanleitung

BLA 50A-001-S115
Balluff Light Array
5

Normalizing and live image

5.1

Live image (Monitor)

The live image function allows the actual CCD signal to be
displayed.
Fig. 5-1: Live image with two objects in the light band
5.2

Signal normalizing and autoblanking

After installation or if the emitter and receiver have been
moved relative to each other, the signal must be
normalized. This means the sensor chooses the optimal
refresh period (exposure time of the CCD).
The menu item Device settings → Normalize is used for
this.
After successful signal normalizing the sensor displays the
live image.
The image shows which areas were blanked when an
object was in the light band during teach (Autoblanking).
Object in the light band (Autoblanking)
Fig. 5-2: Live image after signal normalizing with autoblanking
Important:
– If the entire light band will be used, no object is
permitted to be located in the light band.
– Areas where objects are located during signal
normalizing are blanked (autoblanking).
– The setting under Device settings/Blanking remains
unchanged.
5.3

Info

Here is where status information is shown. This display is
mainly intended for diagnostic purposes. The min./max.
signal values of the light band ("Sig.") and the min./max.
signal values of the ambient light ("Amb.") are stated. The
maximum signal value after signal normalizing is approx.
≤ 3200. The maximum value for ambient light should lie
well below the maximum signal value.
Also shown (under "Period") is the refresh period in
milliseconds (possible values: 1.0 ms to 100 ms). This
value is automatically determined during signal normalizing
and remains stored until another signal normalizing or until
the sensor is restored to the factory default settings (menu
item Device settings → RESET settings). Given optimal
adjustment and clean emitter and receiver windows this
value is small (typ. under 15 ms). The reciprocal of the
refresh period is the switching frequency.
14 english
Fig. 5-3: Status info display
5.4

A1/A2 Calibrate U/I

This function can be used to calibrate both analog outputs
so that the extreme values 0 mm and 48.6 mm are output
precisely as 0 V and 10 V (or 4 mA and 20 mA). This
allows for example the effect of cable resistances to be
compensated.
Setting is done separately for Output 1 and Output 2 and
separately for current and voltage output
NOTICE!
Calibrate only the output type (current or voltage) you are
actually using in order to prevent damage to the
connected controller (PLC, A-D card, etc.) from incorrect
triggering.
When the calibrate U function is invoked, 0 V is first
output on the selected output. Use the arrow keys to set
the "Min" correction factor so that 0 V is displayed on the
analog input of the controller. After confirming the setting
with OK 10 V is automatically applied to the output. Set
the "Max" correction factor in the same way.
Calibration for the current output (calibrate I) works just
the same way. First the sensor outputs 4 mA on the
current output. Select the correction factor "Min" so that
4 mA is displayed on the analog input of the controller.
After confirming with OK 20 mA is output. Set the "Max"
value accordingly and confirm with OK.
Fig. 5-4: Calibrating the analog outputs
5.5

Locking settings

This protects the setting levels from unintended changing.
Locking is indicated by a padlock symbol at the upper
right of the display.
Use "unlock" to enable setting again.
Fig. 5-5: Setting levels locked
Setting levels locked