ISPSoft User Manual

ISPSoft User Manual
When users edit the POU of the function block type, they have to create an input pin which receives
the state code specified by the main program, and output pins which correspond to the three lights
and the buzzer.
Owing to the fact that the corresponding light will be displayed after the function block receives the
state code specified by the main program, a CASE statement can be used in the function block. If
there is another display mode, the users can add a state code, and insert a condition in the function
block.
The users can insert an example of a CASE statement in the working area, and modify the
statement. They can also type the structured text shown below in the working area.
When the users edit the POU of the program type, they have to declare the symbol SC, which
represents a state code, and the function block instance in the local symbol table. Owing to the fact
that there is a precedence mechanism for the control of the tricolor light, an IF statement can be
used in the main program. After a state code is specified, the function block must be called. The
state code is sent to the function block, and the result of the operation is sent to the digital output
11-28