There is code written in structured text that has the following:

State is declared as INT.

IF (State = 0) AND ( something )) THEN

        State [:=] 1;

        Counter [:=] 0.5;

END_IF;

Has any one seen this type of statement before? What is this? I have looked through CoDeSys help and Karl-Heinz book but no luck.

Thanks

You should open sample, and look up - I have the sample of machine control fom current program path "imported". Will working.

I have not found drag-and-drop function from the PLC library

window to worksheet window. ( 2.42 version )

I wait for 3.0? I hope that without of bugs comming soon.

Happy logical programing

regards

I saw an assignment [:=] already, but do not know where in CoDeSys.

The ST in AB-CLX with Rockwell RSLogix5000 use this for initialising the variable to zero on start of plc. Normally all variables are there battery buffered = retain.

regards Ulrich

attached the excerpt from RSLogix help:

Specify a non-retentive assignment

The non-retentive assignment is different from the regular assignment described above in that the tag in a non-retentive assignment is reset to zero each time the controller:

§ enters the RUN mode

§ leaves the step of an SFC (This applies only if you embed the assignment in the action of the step and you configure the SFC for Automatic reset.)

A non-retentive assignment has this syntax:

tag [:=] expression ;

where:

Component: Description:

tag represents the tag that is getting the new value; the tag must be a BOOL, SINT, INT, DINT, or REAL

[:=] is the non-retentive assignment symbol

expression represents the new value to assign to the tag

If tag is this data type: Use this type of expression:

BOOL BOOL expression

SINT

INT

DINT

REAL numeric expression

; ends the assignment