Set up connections for a Latched push button

In the

Graphics Display

editor, double-click the button to open its

Properties

dialog box.

Click the

Connections

tab.

Assign a tag or expression to these connections:

A read-write connection. Assign a tag to this connection. When the operator presses the button, the application writes the value corresponding to the latched state (State 1) to the tag’s data source, unless the

Latch Reset Type

option (on the

General

tab) is "Non-zero" and the Handshake connection is currently a non-zero value.

When the Handshake connection unlatches the button, the application sends the value corresponding to the unlatched state (State 0) to the Value connection.

When you open a display containing a

Latched

push button, the application reads the value of the Value connection to determine its current state.

A read connection. You can assign a tag or an expression to this connection. The application reads the value of the connection at the data source, and updates the object’s display to reflect the state corresponding to the value.

If you assign an expression, the application calculates the value of the expression and updates the object’s display to reflect the state corresponding to the value.

If you assign this connection, the button does not show the current state until it receives a response from the Indicator connection. If you do not assign this connection, the button's state corresponds to the value at the Value connection.

A read connection. You can assign a tag or an expression to this connection. The application reads the value of this connection at the data source, and resets the button to its unlatched state when this connection changes to meet the conditions of the

Latch reset type

option specified in the

General

tab.

If you assign an expression, the application calculates the value of the expression and resets the button to its unlatched state when this connection changes to meet the conditions of the

Latch reset type

option.