Rockwell-automation Logix5000 Controllers Structured Text Programming Bedienungsanleitung PDF herunterladen (Seite 29)

Publication 1756-PM007D-EN-P - November 2012 29

Program Structured Text Chapter 1

Description: The syntax is:

These diagrams show how a FOR...DO loop executes and how an EXIT

statement leaves the loop early.

Arithmetic Status Flags: Not affected

Fault Conditions:

FOR count := initial_value

TO final_value

Optional {

BY increment

If you don’t specify an increment, the loop

increments by 1.

<statement>;

Optional

IF bool_expression THEN

EXIT;

If there are conditions when you want to

exit the loop early, use other statements,

such as an IF...THEN construct, to

condition an EXIT statement.

END_IF;

END_FOR;

statement 1

statement 2

statement 3

Done x number

of times?

Yes

Rest of the routine

statement 1

statement 2

statement 3

Done x number

of times?

Yes

Rest of the routine

Yes

The FOR…DO loop executes a specific

number of times.

To stop the loop before the count reaches the last

value, use an EXIT statement.

A major fault will occur if Fault type Fault code

The construct loops too long 6 1

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 39 40

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