Siemens SIMATIC ET 200M Manual page 220

Device master file
All slave-specific
characteristics are stored in a device master file (GSD file). The format of the
device master file is defined in the IEC 61784-1:2002 Ed1 CP 3/1 standard.
Diagnostic interrupt
Diagnostics-capable modules use diagnostic interrupts to report system errors
that they have detected to the central CPU.
In SIMATIC S7/M7: When an error is detected or disappears (e. g. wire break),
the module triggers a diagnostic interrupt, provided the interrupt is enabled. The
CPU 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 and localizing of errors. The structure of the
diagnosis is defined in the IEC 61784-1:2002 Ed1 CP 3/1 standard. The
diagnosis of the ET 200M is in keeping with the standard.
Distributed I/O devices
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:
S ET 200M, ET 200B, ET 200C, ET 200U
S DP/AS-I Link
S S5-95U with PROFIBUS-DP slave interface
S Other DP slaves from either Siemens or other vendors
The distributed I/O devices are connected to the DP master via PROFIBUS-DP.
DP master
A ³ master performing to the IEC 61784-1:2002 Ed1 CP 3/1 standard is classed
as a DP master.
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
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