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.

Procedure for Declaring Variables

The table below shows the procedure for declaring application variables.

Step	Action
1	In Project browser / Variables & FB instances, double-click on Elementary variables
2	In the Data editor window, select the box in the Name column and enter a name for your first variable.
3	Now select a Type for this variable.
4	When all your variables are declared, you can close the window.

Variables Used for the Application

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

Variable	Type	Definition
Acknowledgement	EBOOL	Acknowledgement of an error (Status 1).
Stop	EBOOL	Stop cycle at end of draining (Status 1).
Valve_Opening_Cmd	EBOOL	Opening of the valve (Status 1).
Motor_Run_Cmd	EBOOL	Startup request for filling cycles (Status 1).
Valve_Closing_Cmd	EBOOL	Closing of the valve (Status 1).
Initiale_condition	EBOOL	Transition that starts the pump.
Desired_Level	REAL	Desired level of liquid.
Tank_ready	BOOL	Tank is full, ready to be drained.
Flow	BOOL	Intermediate variable for simulating the application.
Init_Flow	REAL	Pump initial flow rate.
Flow_Reduction	BOOL	Pump flow rate after reduction.
Pump_Flow	REAL	Pump flow rate.
Valve_Flow	REAL	Valve flow rate.
Motor_Error	EBOOL	Error returned by the motor.
Valve_Closure_Error	EBOOL	Error returned by the valve on closing.
Valve_Opening_Error	EBOOL	Error returned by the valve on opening.
Lim_Valve_Closure	EBOOL	Valve in closed position (Status 1).
Lim_Valve_Opening	EBOOL	Valve in opened position (Status 1)
Run	EBOOL	Startup request for filling cycles (Status 1).
Nb_Stage	REAL	Number of tank filling stage.
Level	REAL	Level of liquid in the tank.
Tank_low_level	EBOOL	Tank volume at low level (Status 1).
Tank_high_level	EBOOL	Tank volume at high level (Status 1).
Stage	REAL	Stage incrementation value.
Contactor_Return	EBOOL	Error returned by the contactor in the event of motor error.
Valve_closure_time	TIME	Valve closure time.
Valve_opening_time	TIME	Valve opening time.
Drain	EBOOL	Drain command

NOTE: EBOOL types can be used for I/O modules, unlike BOOL types.

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