learning function and data blocks (Step7)

I'm learning about functions and data block. I "have" 2 pumps. When process is started pump1 works for 10 sec and then pump2 works for 5 sec. I made that in plain ladder without blocks, but since pumps have ssame interface I thought it is better to write it as function blocks and later just create instance data blocks. I use stat variable to store s5time (in order timer to work). I want to make 2 modes. First pump1 works 10 sec, pump2 5 sec and
second mode: pump1 works 20 sec, pump2 works 10 sec. I got advices to use MOVE block to store time in memory area MW10 which I declared as s5time data type. So memory address MW10 will store work time. Now I have problem when creating. It seems that step7 expects number example (s5t#10s) and not address MW10 on which value is stored.
Is there any way I can do this?

If you have defined two DBs for each pump instance (DB10, and DB11 fo example), and you have defined a STAT for the setpoint (looks like word 6 in your PDF file). Then you acces the actual values via DB10.DBW6 and DB11.DBW6.

1. You can load the setpoint into these two values directly:

L S5T#20S
T DB10.DBW6

L S5T#10S
T DB11.DBW6

2. You can also load from intermediary variables:

L MW10
T DB10.DBW6

L MW12
T DB11.DBW6

3. You can also change the Actual Values from an operator panel.

4. You can also change the Actual Values in each instance DB and use DOWNLOAD PARAMETER SET. Be warned though that this will create a timestamp conflict. That means in turn that STEP7 will like to recreate the DBs whereby the Actual Values will be reset to the Initial Values.

You cannot assign an address as an actual value of a variable in the interface.

I'm afraid STL is totally unknown to me. How to do it in ladder diagrams? I decide to start learning STL after I become comfortable with LAD programming first.I'm trying to use (OPN) to pen data block and then (SS) to set time value, but still no succes
P.s. Sorry about that pdf...
Thanks

Brief example.

STL:
L S5T#20S
T DB10.DBW6

L MW10
T DB10.DBW6


LAD: ("ConstOn" is a variable that you set to TRUE somewhere else).

  ConstOn 

----||--------|MOVE|

     S5T#20S--|    |--DB10.DBW6

 

  ConstOn

----||--------|MOVE|

        MW10--|    |--DB10.DBW6

Thank you JesperMP, you really helped me a lot.

Jesper, this looks like you are referencing instance data from outside the FB. If the FB interface changes, how do you maintain the references to the instance variables ? - re-compile each time ?

I would pass the values into the FB as parameters.

Simon, I do this all the time.
You are right that it is a problem if the FB variable declaration changes. The solution is to change the Adressing Priority from "Absolute" to "Symbolic". Obviously I cannot change an FB variable declaration on a running proces. When the proces has been started up I have to keep my fingers off all the standard FBs I have created.
edit: Passing the parameters as inputs and outputs, as you suggest, would result in the same "problem". You cannot change the variable declaration on an FC or FB "hot" so to speak.

Pandiani,
it just occurred to me that the next problem you will be facing is how to assign an individual S5Timer to each instance of the FB.
The solution is to pass the timer to the FB as an input parameter.
Here is a small example how to do it:



edit:
Just added how the calling code looks like: