Dear SIEMENS forum members,

In my SBR, I use a local real variable ,it doesnt get the required value.
It always gets, -8000.0 (according to program)
**************************************************************************************

Network 1:

....

#var3 = #var1- #var2

....

Network 2: (var2 is var1's previous value)

#var2 = #var1

**************************************************************

Despite of var2 gets var1's previous value (0..32000) in network 2, in the calculation in network 1 its value is constant -8000.0. There are many calculations like this in this SBR, all works fine but this one. there isnt any assingment to that variable other than that in network2.

Hello candyengineer,

Please Notice: Local Variables are temporary only!
The first access to such a temporary variable in a SBR has to be an allocation!
The valuesare not remanent to their value set in a previous cycle of ob1!
So like you use temporary variables, an area of local memory is allocated to the variable, with undefined values, e.g. depending on values from a former called SBR.

You need a remanent variable, so i woulddeclare an IN/OUT Variable (var2) and set a free adress in DB for that variable when calling the SBR modul.
Then you´re able to save the previos value of var1 in var2 (in DB).
I think with this small adaption you´ll get the right values.


I hope thathelps you...