instance DB problem!!!

[naifmbo]

hi everybody,
i have two chillers plant controlled by siemens s7-300 station,this station software includes FB used two times in station's software (for each chiller),this FB has two instance data blocks(for each chiller). when i monitor one of them (FB) i see the parameters flactuating between the two instance DB. why ?

any response will be appreciated.

 

[Rheinhardt]

Did you make sure when you generated the Instance number of the Data block that you used 2 different DB no.

create the db instance from Block type FB number, but use seperate data blocks for each instance. Then montor the or manipulater the Instance DB adress

 

[RolfB]

hi,

goto 'Simatic Manager'; press F1 for help-index;
then type in 'Call evrionment'.
You can find a description also here:
http://support.automation.siemens.com/WW/view/en/21671563

To monitor a FB directly with call-up path:
In 'Simatic manager'-'View' change to 'Online';
Choose the program-block where the FB is called.
In register 'Debug' - 'Operation' choose 'Test Operation'.
Now go to the rung where the FB is called and click in
the box (left click) to highlight the box.
Right click --> 'Called Block ' --> choose
'Monitor whith Call-up Path'.
Now you can monitor the FB with the desired DB.

HTH
Rolf