Device Description MC-HPG-2x0
Display PLC
MC-HPG-2x0
Notes on the touch screen
8 N
OTES ON THE TOUCH SCREEN
8.1 B
ASIC TOUCH SCREEN FUNCTION
The touch screen operates on the active light matrix principle in the infra-
red range. Interrupting this light matrix at any point will initiate an operation
if a touch activated screen element was touched (e.g. a button).
A timeout is initiated if the light matrix is interrupted for longer than
approx.
15s.
The touch panel then switches to the “non-actuated” state, and further
operations cannot be initiated until the initial touch actuation has stopped
(e.g. button released) or the touch is actuated again. Several simultaneous
touch actuations at different points cannot be evaluated.
8.2 P
OWER UP FUNCTION TEST
The MC-HPG-2x0 carries out a function test of the touch screen with each
power up of the device. All IR channels are tested during this stage. Faulty
IR channels are indicated graphically and displayed on screen with an error
message. The failure of IR channels is normally due to severe
contamination of the IR transparent plastic frame which consequently has to
be cleaned ( Section 8.3). The optical elements of the light matrix are
located behind the IR transparent plastic frame in the front of the device.
IR channels that are continuously interrupted will be detected by the Touch
Controller after a timeout of approx. 15s and no longer included in the
evaluation. In extreme cases, this may mean that individual zones cannot
be touch activated.
Do not touch the screen whilst the system is being
started up, and wait till your application has started.
During the startup the touch screen carries out a
function test.
8.3 C
LEANING AND MAINTENANCE OF THE TOUCH SCREEN
For operation ensure that the signal levels of the channels are not so
severely reduced or interrupted due to excessive contamination through dirt
( Section 8.1).
Clean the inside of the plastic frame of the device regularly (
Section 10)
with a damp soft cloth. Ensure that the surface is not scratched or scoured,
especially when removing hard deposits and abrasive dust.
Cleaning should only be carried out with the device switched off!
This
will ensure that any touching of the screen will not accidentally initiate
functions.
Do not expose the front of the device to solvents which may corrode and
loosen the plastic frame (frame material: Makrolon 2805, Manufacturer:
Bayer AG).
04/05 AWB2776-1574GB
©
by Moeller GmbH
35
Summary of Contents for MC-HPG-2x0 Series
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