Siemens SIMATIC ET 200S Manual page 558

Glossary
Diagnostics
Diagnostics involves the identification, localization, classification, display, and
further evaluation of errors, faults, and messages.
Diagnostics includes monitoring functions that run automatically while the system
is in operation. This increases the availability of systems by reducing setup times
and downtimes.
Direct-on-line starter
A direct-on-line starter is a ³ motor starter that switches a motor on or off directly.
It consists of a circuit breaker and a contactor.
Distributed I/O systems
These are input/output units that are not located in the base unit; instead, they are
distributed at some distance from the CPU. The following are examples of such
units:
• ET 200M, ET 200X, ET 200L, ET 200S
• DP/AS-i Link
• S5-95U with PROFIBUS-DP slave interface
• Other DP slaves from either Siemens or other vendors
The distributed I/O systems are connected to the DP master by means of
PROFIBUS-DP.
DP master
A ³ master that complies with IEC 61784-1:2002 Ed1 CP 3/1 is known as a DP
master.
DP slave
A ³ slave running on the PROFIBUS on the basis of the PROFIBUS-DP protocol
in accordance with IEC 61784-1:2002 Ed1 CP 3/1 is known as a DP slave.
DP standard
The DP standard is the bus protocol of the ET 200 distributed I/O system in
accordance with IEC 61784-1:2002 Ed1 CP 3/1.
Equipotential bonding
Electrical connection (equipotential bonding conductor) that brings the exposed
conductive parts of electrical equipment and other conductive parts to the same or
approximately the same potential in order to prevent troublesome or dangerous
voltages arising between these parts.
Glossary-2
ET 200S Distributed I/O System
EWA-4NEB780602402-09