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Glossary
Programmable
The programmable logical controllers (PLC) of the SIMATIC S5 system
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, S7-300) consist
of one or more CPUs and various I/O modules.
Pull-Down Menu
See Drop-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.
RTC
Real-time clock
S
SCSI Interface
Small Computer System Interface. Interface for connecting SCSI devices
(hard disk drives, CD-ROM drives).
Serial Interface
Data is transmitted one bit at a time via a serial interface (port); serial
interfaces are therefore slower than parallel interfaces.
SETUP
A program in which information about the device configuration (that is, the
configuration of the programming device's hardware) is defined. The device
configuration of the programming device is preset with defaults. Changes
must therefore be entered in the SETUP if a memory extension, new
modules, or a new drive are added to the hardware configuration.
SIMATIC Memory
Memory submodules in credit-card format for SIMATIC S5 and SIMATIC S7
Cards
which are programmed with the PG 740 and can be plugged in an S5 or S7
programmable controller.
Glossary-8
Programming Device PG 740
C79000-G7076-C742-01
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