vary a DB numbers at a BLOCK_DB input of a FC

[rick-brinkman]

I use a FC that copy's data from one database to one other.
This FC has two inputs of type BLOCK_DB (One input for a DB number to copy from and one DB number to copy to). Unfortunately the DB number of one BLOCK_DB input isn't constant

So what I want is to change the DB number at a BLOCK_DB input conditionally.
If it’s possible, how can I do this?


Thanks in advance.

 

[JERA]

You could use the instruction: OPN DB[mw202]
MW202 contains the number of the DB you want to open.

 

[PeterW]

You could create a local variable of format WORD and an INT input.

Example

in = DB_No Format INT

temp = tDB Format WORD


Code would be

L #DB_No
T #tDB

OPN DB[#tDB]

 

[SHKODRAN]

I use a FC that copy's data from one database to one other.
This FC has two inputs of type BLOCK_DB (One input for a DB number to copy from and one DB number to copy to). Unfortunately the DB number of one BLOCK_DB input isn't constant

So what I want is to change the DB number at a BLOCK_DB input conditionally.
If it’s possible, how can I do this?
Thanks in advance.

Your function have only one input address for source and another one for destination.You can't use the costant for input , because you need to specific the Db number , start address to copy and length of data to copy.In this case normally is used the data type Any.
You need to put for DB example:

 P#DB100.DBX0.0 BYTE 55

for I example:

 P#I100.0 BYTE 55

for Q example:

 P#Q100.0 BYTE 55

for M example:

 P#M100.0 BYTE 55

DB_Temp:

 P#DB_Temp.DBX0.0 BYTE 55