Rockwell Automation 2711E-ND1 Reference Manual PanelBuilder 1400e - Manual (Page 107)

101 Push Buttons
Publication 2711E-6.15 – November 1998
The Normally Closed Momentary Push Button controls the value at
the Button Control. Normally, this control’s value is 1. When the
button is pressed, the control is set to 0. When the button is released,
the control is reset to 1. If the button is pressed at the moment a
window (Information Message, Alarm Message, or Fault Window)
appears on the screen, the button’s value is reset to 1.
Note: You can assign two or more of these buttons to the same
Button Control. When this is the case, Normally Closed Momentary
Push Buttons function like their hard-wired equivalents wired in
series: pressing either button, rather than both, turns off the PLC
control.
This object also has an Indicator State control, used to control the
display state of the object. The PanelView terminal evaluates the
control and compares the result to the state values to determine
which state to display.
Note: If the Indicator State value does not match any of the defined
state values, an error state occurs and the button displays state 1
without labels. An error state also occurs if the Button Control is not
assigned. In this case also, the button displays state 1 without labels.
Important: The Normally Closed Momentary Push Button does not
retain its value when power is switched off and on
again, after screen changes, or when the terminal is
switched to Configuration mode and then back to Run
mode. The Button Control is reset to the initial state
value.
!
ATTENTION: If a communication error occurs, the
control value remains in its last state and the Button
Control will not reset. For Remote I/O applications, the
rack fault bit should be monitored when these buttons
are being used. For DH+ and ControlNet applications
only, use the active node bits in the status file. See your
controller documentation for more information.
!
ATTENTION: You can use this button as a stop
button but not for emergency stops. Emergency stop
buttons must be hard-wired.
Normally Closed
Momentary (N/C) Push
Button
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