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1.4
Which Operands are available to the User Program?
Process image of the inputs
and outputs PII/PIQ
I/O area (P area)
Extended I/O area (O area)
CPU 948 Programming Guide
C79000-G8576-C848-04
Which Operands are available to the User Program?
The CPU 948 provides the following operand areas for programming:
• • process image and I/Os
• • flags (F flags and S flags)
• • timers/counters
• • data blocks
Characteristics
The user program can access the following data types
in the process image extremely quickly:
-
single bits,
-
bytes,
-
words,
-
double words
Characteristics
The user program can access the I/O modules directly
via the S5 bus.
The following data types are possible:
-
bytes,
-
words.
Characteristics
The user program can access the I/O modules directly
via the S5 bus.
The following data types are possible:
-
bytes,
-
words.
Size
128 bytes
each for
inputs and
outputs
Size
256 bytes
each for
inputs and
outputs
Size
256 bytes
each for
inputs and
outputs
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