Rockwell Automation 2711 PANELBUILDER SOFTWARE USER MANUAL - Manual (Page 273)

The Objects
Chapter 10
10-8
IMPORTANT: The Maintained Push Button is a retentive object. Thus,
the PanelView terminal will retain the current value for the button setting
even after the terminal is turned off or switched to Configuration mode.
For this reason, do not use a Maintained Push Button to initiate a PLC
controlled machine or process. Instead use a Momentary Push Button. You
can assign a preset value to the Maintained Push Button.
Interlocked Push Button
The Interlocked Push Button is actually one push button in a group of push
buttons. The group of buttons functions together in much the same way as
the station selector buttons on a car radio: pressing one cancels the other
buttons and makes a new selection. Although they function as a group,
they are added to the screen individually.
Assign the same button control address, a PLC input address, to each
button in the group. Then assign a unique control value to each button. The
range of the value depends upon the data type and number of bits assigned
to the button control address. When you press an Interlocked Push Button,
the PanelView terminal places this control value at the button control
address in the PLC controller and highlights the selected button.
The Interlocked button remains highlighted as long as the PLC value is the
same as the value of the button. Thus only one button in the group will be
active and highlighted at any given time. On monochrome terminals,
highlighted buttons appear in reverse video; on color terminals they appear
with the foreground and background colors interchanged.
You can accomplish the same functionality with a Control List Selector
with Enter; however, you have much more flexibility in placing
Interlocked buttons on your screen.
If two or more Interlocked Push Buttons have the same control value, both
will be highlighted whenever the associated button control address
contains that value.
IMPORTANT: The Interlocked Push Button is a retentive object. Thus,
the PanelView terminal will retain the current value for the button setting
even after the terminal has been turned off, or switched to Configuration
mode and back to Run mode. You can assign a preset value to the
Interlocked Push Button.