Technical data

Block preheader The programmer also generates a block preheader (DV, DXV, FV,
FXV) for block types DB, DX, FB and FX. These block preheaders
contain information about the data format (for DB and DX) or the
jump labels (for FB and FX). Only the PG can evaluate this
information. Consequently the block preheaders are not transferred to
the CPU memory. You cannot influence the contents of the block
header directly.
Maximum length A STEP 5 block can occupy a maximum of 4096 words in the
program memory of the CPU (1 word corresponds to 16 bits).
Available blocks You can program the following block types:
Data blocks DB 0, DB 1, DB2, DX 0, DX 1 and DX 2 contain
parameters. These are reserved for specific functions and you cannot use
them as normal data blocks.
OB 1 to 39
FB 0 to 255
total 512
FX 0 to 255
PB 0 to 255
SB 0 to 255
DB 3 to 255
total 506
DX 3 to 255
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STEP 5 Programming Language
CPU 928B Programming Guide
C79000-B8576-C898-01
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