Siemens CPU 312, Руководство по аппаратному обеспечению и установке

Страница: 217 / 238

S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
13-1
*ORVVDU\
$FFXPXODWRU
The Æ CPU uses the accumulator registers as intermediate memory for load,
transfer, comparison, calculation and conversion operations.
$GGUHVV
An address represents the ID for a specific address or address range. Example:
Input I12.1; Memory bit word MW25; Data block DB3.
$QDORJ0RGXOH
Analog modules convert process values (e.g. temperature) into digital values, so
that they can be processed by the central processing unit, or convert digital values
into analog manipulated variables.
%DFNSODQH%XV
The backplane bus is a serial data bus. It supplies power to the modules and is
also used by the modules to communicate with each other. Bus connectors
interconnect the modules.
EDFNXS0HPRU\
The back-up memory provides a back-up of memory areas for the Æ CPU without
a back-up battery. It backs up a configurable number of timers, counters, memory
bits, data bytes and retentive timers, counters, memory bits and data bytes).
%XV
A bus is a communication medium connecting several nodes. Data can be
transferred via serial or parallel circuits, that is, via electrical conductors or fiber
optic.
%XVVHJPHQW
A bus segment is a self-contained section of a serial bus system. Bus segments
are interconnected using repeaters.