Rockwell Automation 2711E-ND1 Reference Manual PanelBuilder 1400e - Manual (Page 104)

98 Push Buttons
Publication 2711E-6.15 – November 1998
The following table shows the differences between the push buttons:
Push Button States Response to button-press Response to
screen
changes/mode
switch Response to power
cycles
Normally Open or
Closed Momentary 2 State changes to open (0) or closed (1).
When released, the button returns to its
initial state.
Returns to its initial
state. Returns to its initial
state.
Latched 2 State changes to latched, and remains
latched when released.
The button remains latched until unlatched
by the handshake value from the PLC.
Returns to its initial
state. Returns to its initial
state.
Maintained 2 State toggles, and remains changed when
released.
Pressing the button a second time returns
the button to its initial state.
Retains its changed
state. Retains its changed
state or returns to its
initial state,
depending on the
terminal’s
Application Startup
setting.
Multistate 2 to 255 Cycles through a pre-configured set of
states. Pressing the button triggers the
change of state. The state’s value is then
written to the Button Control. Retains its changed
state. Retains its changed
state or returns to its
initial state,
depending on the
terminal’s
Application Startup
setting.
Interlocked 1 Usually functions as a group of buttons.
Pushing one button cancels out the function
of the previous button pressed, and sets the
Button Control to the newly pressed button’s
control value.
A single Interlocked Push Button can also
be used to set a value.
Retains its changed
state. Retains its changed
state or returns to its
initial state,
depending on the
terminal’s
Application Startup
setting.
Use a Normally Open Momentary Push Button to initiate a
PLC-controlled process or action.
The Normally Open Momentary Push Button controls the value at
the Button Control. Normally, the control’s value is 0. When the
button is pressed, the control is set to 1. When the button is released,
the control is reset to 0. If the button is being pressed at the moment
a window (Information Message, Alarm Message, or Fault Window)
appears on the screen, the button’s value is reset to 0. In other words,
a window appearing is treated as an automatic button release.
Note: You can assign more than one Normally Open Momentary
Push Button to the same Button Control. Normally Open Momentary
Push Buttons using the same control will function like their
hard-wired equivalents wired in parallel.
Normally Open Momentary
(N/O) Push Button
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