Glossary
Glossary-8
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
PROFIBUS-DP
This is the PROFIBUS bus system with the DP protocol. DP stands for
distributed I/O in German. The ET 200 distributed I/O system is based on the
IEC 61784-1:2002 Ed1 CP 3/1 standard.
Programmable controller
Programmable controllers (PLCs) are electronic controllers whose function is
saved as a program in the control unit. The configuration and wiring of the unit
are therefore independent of the function of the control system. The
programmable controller has the structure of a computer; it consists of a CPU
(central processing unit) with memory, input/output modules and an internal bus
system. The I/Os and the programming language are oriented to control
engineering needs.
Programming device
Programming devices (PGs) are essentially personal computers which are
compact, portable and suitable for industrial applications. They are equipped with
special hardware and software for SIMATIC programmable controllers.
Redundant systems
Redundant systems are characterized by the fact that important automation
components are duplicated (redundant). If a redundant component fails, there is
no interruption in the program processing.
Reference potential
Potential from which the voltages of the circuits involved can be observed and/or
measured.
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