Siemens simatic c7-621 Hardware Installation Manual page 124

Glossary
A
Analog
Analog input/output modules convert analog process values (for example,
Input/Output
input/output temperatures) into digital values that can be further processed by
Module
the C7 CPU or they convert digital values into analog manipulated variables.
B
Backup Memory
The backup memory guarantees backup of memory areas of the –> C7-621
without a backup battery. A programmable number of timers, counters,
memory bits and data bytes, the retentive timers, counters, memory bits and
data bytes are backed up.
Baud Rate Speed at which data are transmitted (transmission rate in bps).
(transmission rate)
Bus
A bus is a transmission medium that connects two or more nodes with each
other. Data transmission can be serial or parallel, over electrical conductors
or fiber-optic cable.
C
C7-620 Name of the control system family of devices C7-62x
C7 AS-i
The C7 AS-i is the C7 component that controls communication with the
actuators and sensors via the AS-interface. It also handles the internal C7
data exchange between the C7 AS-i and C7 CPU or C7 OP.
C7 CPU The C7 CPU (central processing unit) contains the controller and arithmetic
unit, memory, operating system and programming ports. The C7 CPU is
independent of the –> C7 OP. The C7 CPU has its own MPI address and is
connected with the C7 OP via the MPI.
C7 I/Os
The C7 I/Os (–> signal module) form the interface between the process and
the programmable controller. They provide digital input and output signals as
well as analog input and output signals. The integral universal inputs have
special functions in the C7 (interrupt/counter inputs).
Glossary-2
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01