Rockwell Automation 2711E-ND1 Reference Manual PanelBuilder 1400e - Manual (Page 111)

105 Push Buttons
Publication 2711E-6.15 – November 1998
Field Meaning
Control
(continued)
You can provide a visual handshake with the PLC by assigning
different PLC addresses to the Button Control and Indicator
State control. If the PLC is programmed to match the value of
the Indicator State control to the value of the Button Control, the
button changes to the state with that value.
If the Indicator State control value does not match any of the
state values, an error state occurs and the button displays state
1 without labels.
Handshake is set by the PLC to confirm that it has recorded the
change for the Button Control. You can assign a tag or
expression to this control. A digital tag is recommended.
The PanelView terminal sets the Button Control to the state 1
value when the operator presses the button. PLC logic must set
the Handshake control to a non-0 value when the Button
Control is set. When the terminal detects a 0 to non-0 transition
in the Handshake control, it resets the Button Control to state 0.
PLC logic must then reset the Handshake control to 0.
If the Handshake control is not assigned, the Button Control
value remains at the state 1 value.
You can adjust the size of the Latched Push Button and format its
foreground color, background color, button margins (touch screen
applications only), border style, fill style, and blink attributes. For
details on formatting objects see “Changing Object Appearance” in
Chapter 9, Creating Objects, in the PanelBuilder 1400e
Configuration Software for Windows User Manual.
A Maintained Push Button has two states. It changes state when
pressed and remains in the changed state when released. Pressing the
button a second time changes the button back to its original state.
This button is also known as “Push-On, Push-Off.”
When the application first runs, the Maintained Push Button is in its
initial state. When the button is pressed, the corresponding Button
Control is set to its other state’s value. The control remains set even
after the button is released. The operator must press the button a
second time to reset the control to the initial state value.
If the Button Control cannot accommodate the state value (if the
value is too large for the control’s address), an error message is
displayed, and the PLC value is not changed. The operator must
clear the fault before continuing.
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.
Maintained Push Button
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