STEP 7 : STL, the LOOP, JC and JCN instructions ...

[buhnen]

Hi all!

I'm testing a routine that I've just written under STL and I would appreciate some help from someone else more experienced than me with this, as I've just come recently from LAD language.

Either I like it or not, indirect adressing,looping, pointers...are to be implemented under STL in Siemens..And here it comes my sweet honeymoon with STL ...

The case is as it follows: I've 8 DBs, instances of a same UDT, this is, with the same structure for them all. DBs are numbered like this DB100, DB101, DB 102 .... DB108

1) My first testing attempt is very simple and it works out fair enough: By means of the LOOP instruction I call an FC several times (the well known FC105 for scaling an analog input) and asign the right parametres from each of the DB's.
This is the code, which I've succesfully tested:

L     100

      T     #DBINDEX

      L     8

META: T     #COUNT

      OPN   DB [#DBINDEX]



      CALL  "SCALE"

       IN     :=DBW16

       HI_LIM :=1.000000e+002

       LO_LIM :=0.000000e+000

       BIPOLAR:=FALSE

       RET_VAL:=DBW20

       OUT    :=DBD8



      L     #DBINDEX

      L     1

      +I    

      T     #DBINDEX

      L     #COUNT

      LOOP  META

2) Now I want to bypass the scaling operation for two of the DBs included within the range from DB100 to DB108. Let's say I want to bypass DB104 and DB105.
So I've modified the code posted above to turn it into what follows:

L     100

      T     #DBINDEX

      L     8

META: T     #COUNT



      L     #DBINDEX

      L     103

      <=I   

      OPN   DB [#DBINDEX]

      JC    A





      L     #DBINDEX

      L     106

      >=I   

      L     #DBINDEX

      L     108

      <=I   

      OPN   DB [#DBINDEX]

      JC    A

      

      JCN   B







A:    CALL  "SCALE"

       IN     :=DBW16

       HI_LIM :=1.000000e+002

       LO_LIM :=0.000000e+000

       BIPOLAR:=FALSE

       RET_VAL:=DBW20

       OUT    :=DBD8



B:    L     #DBINDEX

      L     1

      +I    

      T     #DBINDEX

      L     #COUNT

      LOOP  META

...but here it comes the problem. When I try to test it I can't update the simulation values on my VAT ...It doesn't work...and as far as my fair knowledge on STL allows me to see, this routine makes sense to me

Any hint please?what am I missing out here?

Thanks in advance

 

[buhnen]

...ok, the reason why I couldn't update the variables was because of an issue with double assignment, but that's solved now.

Still my loop doesn't work...It is like the RLO jumps always to the label "A"

I've "fixed" the code adding a L #DBINDEX

before
OPN DB [#DBINDEX]

so now it remains like this:

L     100

      T     #DBINDEX

      L     9

META: T     #COUNT



      L     #DBINDEX

      L     103

      <=I   

      JC    A





      L     #DBINDEX

      L     105

      >=I   

      L     #DBINDEX

      L     108

      <=I   

      JC    A

      JCN   B





A:    L     #DBINDEX

      OPN   DB [#DBINDEX]

      CALL  "SCALE"

       IN     :=DBW16

       HI_LIM :=1.000000e+002

       LO_LIM :=0.000000e+000

       BIPOLAR:=FALSE

       RET_VAL:=DBW20

       OUT    :=DBD8



B:    L     #DBINDEX

      L     1

      +I    

      T     #DBINDEX

      L     #COUNT

      LOOP  META

 

[PeterW]

2) Now I want to bypass the scaling operation for two of the DBs included within the range from DB100 to DB108. Let's say I want to bypass DB104 and DB105.
So I've modified the code posted above to turn it into what follows:

L     100

      T     #DBINDEX

      L     8

META: T     #COUNT



A(

L     103

L     #DBINDEX   // If 103 is less than INDEX

      <I   

)

A(   // AND

L 106  // INDEX less than 106 (i.e. 104 or 105)

<I

)

JC B  // Jump over



OPN   DB [#DBINDEX]                

      

CALL  "SCALE"

       IN     :=DBW16

       HI_LIM :=1.000000e+002

       LO_LIM :=0.000000e+000

       BIPOLAR:=FALSE

       RET_VAL:=DBW20

       OUT    :=DBD8



B:    L     #DBINDEX

      L     1

      +I    

      T     #DBINDEX

      L     #COUNT

      LOOP  META

...but here it comes the problem. When I try to test it I can't update the simulation values on my VAT ...It doesn't work...and as far as my fair knowledge on STL allows me to see, this routine makes sense to me

Any hint please?what am I missing out here?

Thanks in advance

I would use AND for the conditions

 

[PeterW]

L #DBINDEX
L 105
>=I
L #DBINDEX
L 108
<=I
JC A
JCN B

these are not linked, the first comparator does nothing it needs A( or O( with a ) to link them together.

 

[buhnen]

ahaaa ....I understand it now !

I see I'll have to try harder with STL..

Thanks a lot Peter , I'm going to test the code again and see how it goes

 

[buhnen]

test ok : up and rolling!
Thanks again!