Conair S900II System Technical Information PDF herunterladen (Seite 45)

Programming S900–II Level 1

Version 2.2 |–>

IV – Programming instructions

01T01527_2

25.5.00

IV – 2. 4. IF test instruction

This instruction evaluates the variable it contains. Depending on the result, the instruction will or will

not execute the next instruction (IF instruction must never be used alone).

After an IF, all the instructions are valid APART FROM : L, R, MASTER and SLA.

You are offered two choices, once you have selected a variable :

 IF : if the condition evaluated is TRUE, the next instruction is executed.

 IF/ : if the condition evaluated is FALSE, the next instruction is executed (or if the

condition is true, the next instruction is not executed).

Note that these instructions will condition the execution of any subroutine. Complex conditions can

be calculated in the PLC and tested in the main program in IF Bit... or IF/Bit... form, followed by the

call instruction of the desired subroutine.

The following variables can be checked :

OUT CNT BIT or TIM WORD

IN WWORD

For the CNT, WORD and WWORD, the IF instruction enables you to carry out the following

comparisons : =, >= and <=.

Step 3

IF IN 14

Release part 1

If input 14 = 1 (True), the Release part 1 action will be executed.

Release part 1

IN14 = 1

yes

Part O.K. ?

Bit 100

Put into bin

SP5

yes

Place on belt

SP3

Step 3

IF BIT 100

SP3 L0

SP5 L4

Step 5

....

Operator validation

button ? IN 42

yes

Take part

SP7

Step 4

Step 5

IF / IN 42

SP0 L3

Step 6

SP7 L0

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 81 82

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Conair S900II System Technical Information Seite 45

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