Technical data

Register 8: DBL = Data
Block Length
In addition to the DBA register, a DBL register is loaded every time a
data block is called. This contains the length (in words) of the data
block called,
without the block header. The DBL register is set to "0"
before each OB 1 or FB 0 call.
The DBL register
remains the same if the following occurs:
•• a jump operation (JU/JC) causes program execution to continue in
a different block
or
•• a different program processing level is inserted.
It
changes if one of the following occurs:
•• another data block is opened
or
•• the program returns to a higher level block after a new data block
was opened in the inserted block (see also Section 2.4.2).
Access using the Address in ACCU 1
CPU 928B Programming Guide
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