Glossary
Glossary-3
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Diagnostic Buffer
The diagnostic buffer is a buffered memory area in the CPU in which diagnostic
events are stored in the order of their occurrence.
Diagnostic Interrupt
Diagnostics-capable modules use diagnostic interrupts to report system errors
which they have detected to the central CPU.
In SIMATIC S7/M7: When an error is detected or disappears (e. g. wire break),
the ET 200S triggers a diagnostic interrupt, provided the interrupt is enabled. The
CPU of the DP master interrupts the processing of the user program and
lower-priority classes and processes the diagnostic interrupt block (OB 82).
In SIMATIC S5: The diagnostic interrupt appears in the station diagnosis. Using
cyclical querying of the diagnostic bits in the station diagnosis you can detect
errors such as a wire break.
Diagnostics
Diagnostics is the detection, 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 Communication
Direct communication is a special communication relationship between
PROFIBUS-DP nodes. Direct communication is characterized by the fact that the
PROFIBUS-DP nodes ”listen in” to find out which data a DP slave is sending
back to its DP master.
Direct Data Communication
See
Direct Communication
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