Conair S900II System Informacje Techniczne Pobierz pdf (Strona 29)

Programming S900–II Level 1

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III – Program structure

01T01527_2

25.5.00

Example No. 2 : Conditional execution and return to main program step other than the step following

the call step.

Main program

(IN14 = 1)

Step 1

Step 3

Step 5

SP 02

Step 0

Step 9 END

IF IN 14

SP02L34

Step 2

Step 4

L34

Note that this structure allows you to use a same subroutine with different return addresses : the return

address is an integral part of the call instruction. If the return address is other than L00, it always goes

back to a main program step irrespective of the starting point (PRG or SP).

Conditional execution involves use of the “IF” instruction which is described in the section on

subroutine instructions in chapter IV – 2. 4. page 40.

III – 2. 2. Subroutine SP00 : “jump” instruction

Subroutine SP00 is not a standard subroutine. SP00 is a “jump” instruction.

Some programs require jump instructions to return to, or jump to, a given STEP.

Step 8

Step 9

Step 10

IF IN 24

SP 00 L03

L03

IN24 = 1

SP 01 L 00

SP 01

Step 0

Step 7

END

Step 11

is executed if

input IN24 = 0

Note : Label L00 is not valid : SP00 L00 is not allowed.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 81 82

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