MAN0878-09-EN_XLE_XLT_UserManual
A u g u s t 2 3 , 2 0 1 8 P a g e 102 | 158
13.4 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 13.3 – Force and Switch Coils in Ladder Programming in Cscape
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 Online Help in Cscape for more information on control-based screen navigation.
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