Triconex 2658 DCS program or functional module

This procedure explains how to specify properties for function blocks.

Function blocks must have at least one BOOL input and one BOOL output. All input, output,

and local variables in a function block persist from one execution of a function block to the next

execution. Consequently, the same function block invoked with the same inputs may not return

the same outputs.

Any function block previously declared can be used in the declaration of another function block

or program. The scope of an instance of a function block is local to the function block or program

that declares the instance.

Procedure

1 Expand the Application tree and open a program or function block.

2 Double-click the graphic of the function block.

3 Specify these properties on the Function Block tab.

Property

Action

Instance Name Enter a name for this specific implementation of the function block.

Invert Input/Output

If an input or output is inverted, the value is changed to the opposite

value (True to False, or False to True) when the function is executed.

Only available for BOOL inputs.

To invert the value for a specific BOOL value, select the input or

output and then select the Invert Input/Output check box.

Width

Click + or – to increase or decrease the width of the selected function

block graphic on the logic sheet.

EN/ENO

Only available with functions.

Double Space

Select the check box to have space in the function block graphic on

the logic sheet doubled between the inputs and outputs. The default

is cleared.

This procedure explains how to specify the Usage property for function blocks, which

determines how the function block is used in a program. You can specify the usage for user

defined function blocks, but you cannot change the settings for TriStation 1131 library function

blocks.

Procedure

1 Expand the Application tree and expand the User Documents folder.

2 Right-click a function block, click Properties, and then click the Usage tab.

3 Specify one of these settings on the Usage tab.

4 Click OK to save your selection.

Setting

Action

Space Saver Use when a single instance can be executed more than once per scan to

reduce memory usage and increase performance.

For more information on specific requirements for using a function block as

a space saver, see Space Saver on page 428.

Exactly Once

Use when each instance should be executed exactly once per scan.

Only Once

Use when each instance should be executed only once per scan, but does not

need to be executed every scan.

Internal State

Use when a single instance can be executed more than once per scan.

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