Rockwell Automation 2711-ND3 PanelBuilder v2.60 Software User Manual - Manual (Page 132)

8–2 Creating Push Buttons
Publication 2711-6.0
Push buttons can function like mechanical push buttons. A logic
value of 0 represents open contacts and a logic value of 1 represents
closed contacts. Push buttons can also have a numeric value for
pressed, released or multiple states. The terminal sends the value to
the controller for each change of state.
Each push button state can have unique visual characteristics such as
inner text or graphic, fill pattern and line type.
Momentary Push Buttons change state (close or open contacts)
when pressed and return to their initial (0) state when released.
Maintained Push Buttons change state (close or open contacts)
when pressed and remain in this state when released. Pressing and
releasing the push button a second time returns the button to its
selected initial state. Maintained push buttons retain their state
following screen changes. The state of a maintained push button
after a power-up is determined by the powerup option selected in the
Terminal Setup dialog.
Latched Push Buttons change state (close or open contacts) when
pressed and remain in this state when released. The button does not
return to its initial (0) state until unlatched by a handshake bit or
value in the controller. The latched status is not maintained after a
power-up but is retained following a screen change.
Multistate Push Buttons have between 2 and 16 states. Each state
sets a bit or value at a controller address. Every time the push button
is pressed and released, it changes to the next state. After the last
state, the push button returns to its selected initial state. Multistate
push buttons retain their current state following screen changes. The
state after a powerup is determined by the powerup option selected
in the Terminal Setup dialog.
State 0
Button Pressed OFF MEDIUM HIGH LOW OFF Button Pressed Button Pressed
State 1 State 2 State 3
Momentary, maintained and latched push buttons can have either
normally open or normally closed contacts. You also assign
normally open or normally closed contacts to a multistate push
button with two states.
•
Normally Open Contacts have a logic value of 0 as the initial
push button state. Pressing the button changes the value to 1.
•
Normally Closed Contacts have a logic value of 1 as the initial
push button state. Pressing the button changes the value to 0.
Push Button Types
Contact Types