TBL lookup table function

jason.kania · July 5, 2023, 7:12pm

The TBL functionality has been promised for some time, but it is not clear what it will even look like. If it is is only for static tables, it is of limited use and a missed opportunity. I have raised a request in github at the following location:

github.com/temcocontrols/T3000_Building_Automation_System

Control Basic TBL function needs to handle variable lookup

opened 07:10PM - 05 Jul 23 UTC

lonerzzz

The current Control Basic TBL functionality has been promised for some time but …it is unclear how it would work. If it is only for static value lookup it is of limited use. The function should be able to take a variable memory location to represent the head of the table and an offset into that table in order to retrieve values. This would save considerable amounts of code where repeated 'if' structures are currently required to select the appropriate value in a table. The following is how it is now required to use variable based tables. ``` 10 if value = 0 then lookupValue = var10 20 if value = 1 then lookupValue = var11 30 if value = 2 then lookupValue = var12 40 if value = 3 then lookupValue = var13 50 if value = 4 then lookupValue = var14 ``` when it would really make sense to have the following instead: ``` 10 lookupValue = tbl( value, var10 ) ``` Between the the small program sizes and the lack of table functionality, far more code must be written to handle something relatively simple and common in programs

I am not sure if these issues are being looked at regularly because none have had comments added.

maurice · July 7, 2023, 6:51am

Thanks Jason, our team will work on it ASAP.

chelsea · July 18, 2023, 1:56am

We added TBL function in the latest firmware rev64.1

Set the table
We can set it in customer range. There are 5 talbes.

image1385×1028 107 KB
demo for TBL function

jason.kania · July 18, 2023, 2:55am

Chelsea,

Thanks for the details. This clarifies that the tables are static and not something we have a use for right now. In the future, if the tables are allowed to reference a variable range, that will be something that we can use since we can then update the table contents via MODBus. It would enable a sort of array functionality.

Thanks,

Jason