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 32 767 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, DB 2, DX 0, DX 1 and DX 2 contain
parameters. These are reserved for specific functions and you cannot use
them as normal data blocks.
Data block DX 2 is reserved for the 2nd serial interface and you should
not use it.
OB
1 to 39
FB
0 to 255
total 512
FX
0 to 255
PB
0 to 255
SB
0 to 255
DB
2 to 255
total 508
DX
3 to 255
STEP 5 Programming Language
CPU 948 Programming Guide
2 - 14
C79000-G8576-C848-04
Содержание CPU 948
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Страница 72: ...Data Blocks CPU 948 Programming Guide 2 42 C79000 G8576 C848 04 ...
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Страница 324: ...Examples of Parameter Assignment CPU 948 Programming Guide 7 18 C79000 G8576 C848 04 ...
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Страница 370: ...Addressable System Data Area CPU 948 Programming Guide 8 46 C79000 G8576 C848 04 ...
Страница 372: ...Contents CPU 948 Programming Guide 9 2 C79000 G8576 C848 04 ...
Страница 404: ...Operations with the Base Address Register BR Register CPU 948 Programming Guide 9 34 C79000 G8576 C848 04 ...
Страница 486: ...Contents CPU 948 Programming Guide 11 2 C79000 G8576 C848 04 ...
Страница 522: ...PG Functions via the S5 Bus CPU 948 Programming Guide 11 38 C79000 G8576 C848 04 ...
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Страница 538: ...Contents CPU 948 Programming Guide 13 2 C79000 G8576 C848 04 ...
Страница 546: ...List of Key Words CPU 948 Programming Guide Index 6 C79000 G8576 C848 04 ...