Why is there an P# infront of the bit that is used

I am looking at a connections on a FC and I am wondering why one input is used as P#DB1206.DBX70.0 instead of just DB1206.DBX70.0?

I know that the P# is indication of a pointer but what does that do in this case?

You are not telling us everything now, a screen shot would be nice.

Usually after the P#DBxx.DBXyy.y there is the amount of data also. Or the data amount is given somewhere else to the function.

xmnj

I am looking at a connections on a FC and I am wondering why one input is used as P#DB1206.DBX70.0 instead of just DB1206.DBX70.0?

I know that the P# is indication of a pointer but what does that do in this case?

To know what this do, you must check the code of the FC in question.

xmnj

I am looking at a connections on a FC and I am wondering why one input is used as P#DB1206.DBX70.0 instead of just DB1206.DBX70.0?

I know that the P# is indication of a pointer but what does that do in this case?

Point is is your FC data input data type POINTER or ANYPOINTER.

 Simatic if you just type P#DB1206.DBX70.0 convert to simbolic name for example "Data".Points

Simatic if you just type DB1206.DBX70.0 convert to simbolic name for example "Data".Points.myfirstbit

"Data".Points.myfirstbit  and "Data".Points  they got the same address. Name of your array has same address as first element of existing array.

Usually it makes difference when there is POINTER or ANYPOINTER

•  If your input is P#DB1206.DBX70.0 than your input data type can be Anypointer size of 10bytes.You have also option to add more information something like this P#DB1206.DBX70.0 BYTE 10
  
• If your input is DB1206.DBX70.0 than your input data type should just Pointer size of 6 bytes. You can not pass something like this P#DB1206.DBX70.0 BYTE 10

Hello Hati,

Thank you for answering.

Naturally you are right - I usually try to attach screenshots - but I had the misconception that I could explain this one without. :-D

Hati

You are not telling us everything now, a screen shot would be nice.

Usually after the P#DBxx.DBXyy.y there is the amount of data also. Or the data amount is given somewhere else to the function.

Maybe that address DB1206.DBX70.0 if you look into DB1206 for DBX70.0, it is actually a Word or Real and you are using the pointer to point at 1 of the word/real bits.

double check this for me .

best regards

Hi Matrex90,

Thank you for answering.

As far as I can see that is not the case here.

But even IF it was listed in the DB as a DB1206.DBW70 I thought it would still be possible to read and write to the bit DB1206.DBX70.0 without putting a P# in front of the address - is this not true?

Matrex90

Maybe that address  if you look into DB1206 for DBX70.0, it is actually a Word or Real and you are using the pointer to point at 1 of the word/real bits.

double check this for me .

best regards

 As you wish :-)

Matrex90

please send another pic beginning of this DB