Rockwell Automation 2711 PANELBUILDER SOFTWARE USER MANUAL - Manual (Page 271)

The Objects
Chapter 10
10-6
When two or more of these buttons are assigned to the same Button
Control address, they function like their hard-wired equivalents wired in
series: pressing either button, rather than both, turns off the PLC input bit.
IMPORTANT: The Momentary Normally Closed Push Button is not
retentive or presettable.
If the button is being pressed at the moment when a window (Information,
Alarm or Fault Window) pops up on the screen, its value is reset to 1.
ATTENTION: For Momentary Push Buttons (Normally Open
and Closed) the input bits remain in their last states and the
buttons’ input bits will not reset if a remote I/O fault occurs.
The rack fault bit should be monitored when using these
buttons.
Latched Push Button
The Latched Push Button uses a “handshake” bit (usually a PLC output bit)
as well as the button control and indicator bits.
Pressing the button will set the Button Control bit to 1. The PLC program
must set the handshake bit to 1 when the Button Control bit is set to 1.
When the handshake bit is set to 1, PanelView will reset the control bit to
0. Your PLC controller must be programmed to turn the handshake bit off
(to 0).
You can use a latched input push button if you have a PLC controller with
long program and I/O scan times. Use the handshake bit to signal that the
program has indeed read the PLC input bit. In theory you can accomplish
the same thing by establishing a long enough Push Button Input Hold
Time, but a Latched Input Push Button takes the guesswork out of
estimating the program or I/O scan times.
You could also use this push button if you want the control bit to remain on
until a particular process within the PLC controller is completed.
IMPORTANT: Operator screen changes are not permitted while the PLC
control bit is on. If the PLC controller initiates a screen change, the control
bit is reset to 0.
The Latched Push Button has two display states, 0 and 1. The push button
display state is controlled by the Indicator State Address. You can use this
feature to configure the button in a number of ways: