2.2.3 Operands
The following series of operands is available for programming the
CPU:
n Process image and periphery
n Bit memory
n T
imers and counters
n Data blocks
The user application can quickly access the process image of the
inputs and outputs PIO/PII. Y
ou may manipulate the following types of
data:
n individual Bits
n Bytes
n Words
n Double words
You may also gain direct access to peripheral modules via the bus
from user application. The following types of data are available:
n Bytes
n W
ords
n Blocks
The bit memory is an area of memory that is accessible by means of
certain operations. Bit memory is intended to store frequently used
working data.
You may access the following types of data:
n individual Bits
n Bytes
n W
ords
n Double words
In your program you may load cells of the timer with a value between
10ms and 9990s. As soon as the user application executes a start-
operation, the value of this timer is decremented by the interval that
you have specified until it reaches zero.
You may load counter cells with an initial value (max. 999) and incre-
ment or decrement these when required.
A data block contains constants or variables in the form of bytes,
words or double words. You may always access the current data
block by means of operands.
You may access the following types of data:
n individual Bits
n Bytes
n W
ords
n Double words
Process image and
periphery
Bit Memory
Timers and counters
Data Blocks
VIPA System 300SBasics
Operating structure of a CPU > Operands
HB140 | CPU | 314-6CF03 | GB | 16-43 12
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