Horner APG QX351 OCS HEQX351C103 - Manual (Page 63)

MAN0892-03-EN CH. 11
February 25, 2010 Page 63 of 109 #1039
Figure 11.4: Screen Jump Object (configured to return to previous screen)
Note that changing the current displayed screen through use of a display coil in ladder logic clears the
screen jump queue.
11.5
Ladder Based Screen Navigation
Ladder logic can use several techniques to control screen navigation. Coils can be tied to %D registers
to make them screen coils. These coils have two modes, switch and alarm. If the ladder program
energizes an alarm display coil, the screen associated with this coil is displayed and overrides the normal
user screens. This is designed to show alarm conditions or to display other ladder-detected events.
When the text coil is de-energized, the previous screen that was being viewed before the alarm is
returned.
The switch display coil switches to the associated screen when it is energized. Once it is de-energized
the screen remains until it is switched by the user or ladder.
Figure 11.5: Force and Switch Coils in Ladder Programming
There is also a system register that can be used to for control based screen navigation. %SR1 can be
read to determine the current screen or written to change the current screen.
Refer to the on-line help in Cscape for more information on control-based screen navigation.
11.6
Beeper Acknowledgement
The QX contains an internal beeper that provides an audible acknowledgment when an operator touches
a graphic object that accepts touch input. When the graphic object is enabled, a short 5ms tone is