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14.5 Screen Navigation
To allow the operator to change screens, a Screen Jump Object is generally used. This object
may be visually represented as a 3-D button (responding to touch) or remain invisible and
logically tied to an OCS register. An optional system ICON may be configured for display along
with the legend, which aids in identifying the object as one that causes a screen change (shown
below in Figure 14.3).
Screen Jump Object
Figure 14.3
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Typical Screen Jump Object
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.