Siemens SIMATIC ET 200M Operating Instructions Manual page 254

Glossary
Diagnostic interrupt
Modules with diagnostics capabilities use diagnostic interrupts to report detected system
errors to the CPU.
In SIMATIC S7 / M7: If interrupts are enabled the module will trigger a diagnostic interrupt
when an error is detected or when an error disappears (e.g. wire breakage). The CPU then
interrupts the user program or any lower priority classes and starts processing the diagnostic
interrupt block (OB 82).
In SIMATIC S5: The diagnostic interrupt is simulated in the device-specific diagnostics. Cyclic
scanning of the relevant bits in the device-specific diagnostics will enable you to detect errors
such as wire breakage.
Diagnostics
The detection, localization, classification, visualization and further evaluation of errors,
disturbances and messages.
Diagnostics provides monitoring functions which are executed automatically when the
system is in RUN. This increases plant availability by reducing commissioning times and down
times.
Distributed IO devices
are input/output units, set up at a distance from the CPU instead of being used within the
unit. They include:
• ET 200M, ET 200S, ET 200S, ET 200eco
• DP/AS-I Link
• S5-95U with PROFIBUS-DP slave interface
• other Siemens or non-Siemens DP slaves
PROFIBUS DP connects the distributed IO devices to the DP master.
DP master
A → master that performs to the standard IEC 61784-1:2002 Ed1 CP 3/1 is called DP master.
DP slave
A → slave that is operated by the PROFIBUS using the PROFIBUS DP protocol and that
performs to the standard IEC 61784-1:2002 Ed1 CP 3/1 is called DP slave.
DP standard
is the ET 200 distributed I/O system's bus protocol that complies with the standard IEC 61784-
1:2002 Ed1 CP 3/1.
254
Operating Instructions, 04/2022, EWA-4NEB7806006-09
ET 200M