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Chapter 11: User Defined Function Blocks LogicPro User’s Guide

168 Watlow Anafaze Doc.# 28002-00 Rev 3.00

When a UDFB is defined, LogicPro generates two associated

files:

• A header file.

• A C code file.

The header file contains the definition of a structure for that

UDFB and function prototypes. The C file contains four

functions:

Main Program - called during evaluation of the user Program

and performs the task of the UDFB.

Initialization - called only once, when the user Program starts

to run.

Reset - called only when the UDFB is in an unstored action

and that action becomes inactive.

Exit - called once, if the user Program terminates.

In most cases, you will not use the initialization, exit, and reset

functions; therefore, you will not need to add code to those

functions.

Defining a New or Editing an Existing UDFB

In order to create a new UDFB the user must first open or

create a Project and a Resource.

To create a new UDFB:

1. Select the File menu.

2. Select New.

3. Select User Defined Function Block. The New

UDFB dialog box appears, as shown in Figure 11.1 on

page 169.

4. Enter the complete name of the UDFB in the Long field.

This is the name of the UDFB as it appears in the list of

available UDFBs in the Ladder diagram editor. The Long

name is limited to 27 characters or less.

5. Enter an abbreviated name for the UDFB in the Short

field. The Short name is the label that is placed at the top

of the graphical representation of the Function Block as

it appears in the Program editor.

The Short name must:

• Use a letter from A to Z for the first character.

• Be 4 characters or less in length.

• Not use a space or other illegal character.

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Watlow LogicPro Bedienungsanleitung Seite 184