Siemens SIMATIC ET 200S Operating Instructions Manual page 154

Glossary
Device names
Before an IO device can be addressed by an IO controller, it must have a device name. This
procedure was selected for PROFINET because names are easier to handle than complex
IP addresses.
Assignment of a device name for a concrete IO device can be compared with the setting of
the PROFIBUS address for a DP slave.
An IO device does not have a device name upon delivery. An IO device can only be
addressed by an IO controller - i.e., for transferring configuration data (including the IP
address) during startup or for user data exchange during cyclic operation - after it has been
assigned a device name with the programming device/PC.
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 starter
A direct starter is a → motor starter that switches a motor on or off directly. It consists of a
circuit breaker and a contactor.
Distributed IO systems
These are input/output units that are not located in the base unit; instead, they are
distributed at some distance from the CPU, for example:
● ET 200M, ET 200X, ET 200L, ET 200S
● DP/AS-I Link
● Other DP slaves from either Siemens or other vendors
The distributed IO systems are connected to the DP master by means of PROFIBUS DP.
DP master
A → master that complies with IEC 61784-1:2002 Ed1 CP 3/1 is known as a DP master.
DP slave
A → 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 IO system in accordance with
IEC 61784-1:2002 Ed1 CP 3/1.
154
Operating Instructions, 08/2008, A5E00515771-06
ET 200S