MAN1256-05-EN_EXLW_XLWP_UM
November 10, 2021
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14.5 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 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.