Knowledge Base

The syntax:

 An example:

Word Modbus TCP/IP frames length are limited to 125.
We need to supervise 60 valves, each valve requiring 10 words.
5 Word frames are created (120 words each).
So Valve1 should be on frame1, Valve13 should be on frame2…

• 1 <= Valve number <= 12 to Frame 1
• 13 <= Valve number<= 24 to Frame 2
• 25 <= Valve number <= 36 to Frame  3
• 37 <= Valve number <= 48 to Frame 4
• 49 <= Valve number <= 60 to Frame 5

 To do that with Application Architect:

1. First we need to allow recursive property in project settings (so you can use a calculated parameter in another calculated parameter):
   
   
2. Creation of parameters
   
   1. pValve to specify the valve number. Data type is int and default value is 1.
      
      
   2. pFrameIndex to calculate frame index. Data type is Int. Formula: =Truncate(if(Params(“pValveNumber”)%12=0, Params(“pValveNumber”)/12, Params(“pValveNumber”)/12)+1)

   3. pFrameName to calculate frame name
      
       
3. Creation of the template Valve
   1. Parameter affectation
      
      
   2. Configuration of a register
      Offset =Truncate(if(Params(“pValveNumber”)%12=0, 120-20, (Params(“pValveNumber”)%12-1)*20))

   3.  Configuration of another register…
      Imagine we add a new register for the valve, then we just have to copy/paste the first one and add +2 in the offset expression:
      Offset = Truncate(if(Params(“pValveNumber”)%12=0, 120-20, (Params(“pValveNumber”)%12-1)*20))+2 

4.  A possible result when instantiating
   
   Just set the pValveNumber input parameter and all the adresses will be calculated.

5. Trick!
   If the end of the template instance is equal to the number of the valve then there is no need to input the value again.
   Just change the type of the pValveNumber to be an expression:
   
   Formula =StrRight(TemplateInstance.Name,2)