Rockwell Automation 2711 PANELBUILDER SOFTWARE USER MANUAL - Manual (Page 270)

The Objects
Chapter 10
10-5
More than one Momentary Normally Open Push Button can be assigned to
the same Button Control Address. Momentary Normally Open Push
buttons using the same PLC input address operate like their hard-wired
equivalents wired in parallel.
IMPORTANT: The Momentary Normally Open 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 0.
Momentary Normally Closed (N/C) Push Button
The Momentary Normally Closed Push Button controls the value at the
Button Control Address, a PLC input address. Normally, this bit is 1. When
the button is pressed, the bit is reset to 0. When you release the button, the
bit is set to 1.
This push button can be used as a stop button but not for emergency stops.
Emergency stop buttons must be hard wired.
To ensure that the PLC controller doesn’t miss a rapid button-press
between I/O scans, you can select the Minimum Push Button On Time
under Options in the File Menu. This “holds the button down” for a
minimum preset time.
In addition to the Button Control address, this object has an Indicator State
address used to define the display state of the object. Two states are
possible, 0 or 1. You can use these features to configure the button in a
number of ways:
if you assign just the Button Control address and assign text and
attributes to state 0, the border on the button will highlight when you
press the button, but the button itself will remain unchanged
if you assign the same address to the Button Control address and
Indicator State address, and assign different text and attributes to state 0
and 1, the button will immediately change to state 0 when pressed and
to state 1 when released
to provide a visual handshake with the PLC controller, assign a PLC
input address to the Button Control bit and a PLC output address to the
Indicator State address. Program the PLC controller to turn the Indicator
State bit on when the Button Control bit is off, and the button will
change to state 1