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

Doc.# 28002-00 Rev 3.00 Watlow Anafaze 175

The library is stored in the following directory:

\logicpro\user\bc

After the UDFB library is successfully built up, you can use

the UDFB in a Ladder diagram or Function Block Diagram

Program as a standard Function Block. When your Program is

compiled and linked for execution, the library is automatically

linked by LogicPro. All the functionality in LogicPro which

is available to standard Function Blocks is also available to

User Defined Function Blocks.

UDFB in Simulation

UDFBs are most often used to perform some application

specific tasks. Some of them may be hardware specific.

However, simulation in LogicPro can run on a PC that may

not be able to perform such hardware specific tasks. The user

may want to simulate hardware which is not available in

simulation mode.

In order to overcome the problem, a pre-defined macro,

SIMULATION, is automatically inserted if Compile for

Simulation or Build Simulation Lib is selected from the

UDFB menu. You must use:

• #ifndef SIMULATION

•#endif

to exclude all hardware and target operation system specific

code for conditional compiling. The pre-defined macro,

SIMULATION, also allows you to write code in order to make

the UDFB behave the way you want it to in simulation.

To have a UDFB run in both simulation and the execution

environment, refer to the following example:

int XXXX(bool EN,bool *Q,int *C,XXXXStruct *XXXXStructA)

{

#ifndef SIMULATION

all the hardware and target operation specific code

#endif

#ifdef SIMULATION

code that user wants in simulation

#endif

}

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Watlow LogicPro Manual do Utilizador Página 191