Declaration of Variables

At a Glance

All of the variables used in the different sections of the program must be declared.

Undeclared variables cannot be used in the program.

NOTE: For more information, refer to chapter Data Editor.

Variables Used for the Application

The following table shows the details of the variables used in the application.

Variable	Type	Definition
EDT variables
Open	BOOL	Open command for the inlet gate
Close	BOOL	Close command for the inlet gate
Stop	BOOL	Stop command for the inlet gate
Motor_Forward	BOOL	Open the inlet gate (Motor+)
Motor_Backward	BOOL	Close the inlet gate (Motor-)
Brake	BOOL	Blocks the inlet gate
Open_Limit	UDINT	Open limit
Close_Limit	UDINT	Close limit
IODDT variable
Gate_Position	T_SSI_BMX	IODDT of type T_SSI_BMX for the %CH0.1.0 address

The following screen shows the application variables and their address created using the data editor:

NOTE: Click on

in front of the derived variable Gate_Position to expand the I/O objects list.