Maple Systems OIT Family - Manual (Page 41)

Screen Chain
Often, an event occurs which requires a message or menu be sent to the OIT operator
that is longer than the space provided on one screen of the OIT. To compensate for the
limited size of the OIT’s display, message or menu screens can be chained together so
that they can be viewed in succession. When one of the chained screens is currently
displayed, other screens that are chained to it can be displayed by using the PAGE UP
and PAGE DOWN keys.
NOTE:The PAGE UP key is not available on the OIT3160 and OIT4160.
A message loop can be created by chaining the last screen in the chain to the first screen
in the chain. In addition, a chained series of screens can be continuously displayed
without any keypress or request from the PLC by configuring each screen in the chain for
timed display. For more information on configuring screens for timed display, refer to the
Timed Display section in this chapter.
In the following example, Screen #1 is chained to Screen #5 which is chained to Screen #3.
Screen #1 Screen #5 Screen #3
Gas Volume 22836 cf
Flow Rate 15 cfm
Cooler Temp 50
Motor ON
Oven Door CLOSED
Fluid Temp 60°C
When Screen #1 displays, a “->” symbol displays in the lower right corner of the screen. This
symbol indicates that Screen #1 is chained to another screen. Pressing the PAGE DOWN key
displays the next screen (Screen #5). Screen #5 displays with a “<->” symbol. This symbol
indicates that the displayed screen is in the middle of a chained sequence. At this point,
pressing the PAGE UP key displays the previous screen (Screen #1) and pressing the PAGE
DOWN key displays the next screen (Screen #3). Screen #3 displays with a “<-” symbol. This
symbol indicates that the displayed screen is the last screen of a chained sequence. At this
point, pressing the PAGE UP key displays the previous screen (Screen #5).
To configure message/menu screen chains:
1. Create the message or menu screens using the Screen Editor.
NOTE:The lower right character in each chained screen is used to display the chain symbols
and therefore is not available.
2. For each screen in the chain, in the Extensions group box, select the Chain check box
and enter the screen number of the screen to link to.
Help Screen
Each message, recipe, or menu screen can display one help screen when the HELP key is
pressed. The help screen can be different for each message, recipe, or menu screen.
To link to a help screen:
1. In the Extensions group box, select the Help check box and enter the screen number
of the help screen you want displayed when the OIT operator presses the HELP key.
Stored Screens 41
1010-0099, Rev. 07