BDD Touch Display
4
Electrical connections
16
4.9 Control inputs
The three control inputs at terminal 10, 11
and 12 have HTL PNP characteristics.
In the
c
ommanD
menu
the programmable
functions for the control inputs can be
assigned. Available functions are: reset the
display value, display switching, locking the
touch screen or release the lock function of
the control or relay outputs.
Wiring of the control inputs:
Unconnected control inputs are always
low
.
All inputs are designed to receive impulses
from an electronic impulse source.
Notice for mechanical switching
contacts:
When exceptionally mechanical contacts are
used, please connect an external capacitor
between GND (–) and the corresponding
input (+). A capacity of 10 μF will reduce the
input frequency to 20 Hz and miscounting
due to contact bouncing will be eliminated.
4.10 BDD 750-_ _ _ _-103-…:
analog output
A 16 bit analog output is available at
terminal 13 and 14 / 15.
This output can be configured and scaled in
the
a
nalog
out
menu
.
The following configuration is possible:
– voltage output: –10…+10 V
– current output: 0…20 mA
– current output: 4…20 mA
The analog output is proportional to the
reference source and is referenced to
potential AGND.
AGND and GND are internally
interconnected.
Important
A parallel operation with
voltage and current output at
the analog output is
not
allowed!
