MAN0974-13.1-EN_XL7_UM
August 19, 2021
Page 138 | 198
14.6 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 14.4
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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.
14.7 Beeper Acknowledgement
The XL7 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 emitted. When the graphic object is disabled, a longer 100ms tone
is emitted to enounce that graphical object is not currently accepting the touch input.
If beep acknowledgement is not desired, the beeper function can be disabled from the System
Menu.