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2-2

2.1.1 Calling a Subroutine

To use the same program at different positions in one program describe the

process as a subroutine. The subroutine can be used by calling it from the

different positions.

The subroutine must be described in the same file as the calling program.

If a subroutine is called using a GOSUB statement, control moves to the

subroutine. If control executes a RETURN statement on the last line of the

subroutine, it returns to the next line of the program that called the subroutine.

A subroutine can be called from another subroutine.

Because the subroutine is in the same file as the calling program, local

variables are common. Therefore, variables do not have to be transferred

when the subroutine is called. However, it cannot be called from other files

and it cannot be directly started from the pendant or an external device either.

Main routine

(Calling routine)

Main routine

(Calling routine)

Subroutine 1

Subroutine 2

Program example 1

Calls same program

many times.

Program example 2

Calls other subroutine from a

subroutine.

Fig. 2-2 Calling a Subroutine

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 691 692

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