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Programmable
The programmable logic controllers (PLC) of the SIMATIC S5 system
Logic Controller
consist of a central controller, one or more CPUs and various I/O
modules. The PLCs of the SIMATIC S7 system (for example, S7-200,
-300, -400) consist of one or more CPUs and various I/O modules.
Programmable
The programmable logic controllers (PLC) of the SIMATIC S5 system
Logic Controller
consist of one or more CPUs and various I/O modules. The PLCs of
System
the SIMATIC S7 system (for example, S7-200, S7-300, S7-400) consist
of one or more CPUs and various I/O modules.
See Drop-Down Menu
Pull-Down Menu
R
RAM
RAM (Random Access Memory) is a read/write memory in which every
memory location can be addressed individually and its contents
changed. RAM is used to store data and programs.
ROM
ROM (Read Only Memory) is a memory in which every memory
location can be addressed individually. The stored programs and data
are permanently programmed at the factory before delivery and are not
lost in the event of a power failure.
RS-232 Interface
The RS-232 interface is a standardized interface for data transmission.
Printers, modems and other hardware modules can be connected to a
RS-232 interface.
RTC
Real Time Clock
S
SCSI Interface
Small Computer System Interface. Interface for connecting SCSI
devices (hard disk drives, CD-ROM drives).
Data is transmitted one bit at a time via a serial interface (port); serial
Serial Interface
interfaces are therefore slower than parallel interfaces.
PG 720 PII Programming Device
C79000-G7076-C756-02
Glossary
Glossary-9
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