Siemens SIMATIC ET 200AL, System Manual

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Functions
5.2 Intelligent IO devices (I-devices)
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Initial status Event I-device response Higher-level IO controller
I-device CPU is in
RUN, higher-level
IO controller is in
RUN
The higher-level IO
controller changes
to STOP
During the updating of the process
image with the instructions
"UPDAT_PI" and "UPDAT_PO" an error
report is returned at the parameter
RET_VAL.
With direct IO access to the input
transfer areas to the higher-level IO
controller: depending on the type of
error handling, e.g., call of OB 122
(IO access error).
Note: Output transfer areas can still
be accessed.
-
Higher-level IO
controller is in
STOP, I-device
CPU in RUN
The higher-level IO
controller starts up
Call of OB 83 (pull/plug) for input
transfer areas to the higher-level IO
controller.
Until call of OB 83 in the case of di-
rect access to the input transfer areas
to the higher-level IO controller: de-
pending on the type of error han-
dling, e.g., call of OB 122 (IO access
error).
Call of OB 100 (startup).
I-device CPU is in
RUN, higher-level
IO controller is in
RUN
Station failure I-
device, for exam-
ple, through bus
interruption
If the I-device continues to run with-
out a bus connection:
Call of OB 86 (rack failure).
During the updating of the process
image with the instructions
"UPDAT_PI" and "UPDAT_PO" an error
report is returned at the parameter
RET_VAL.
With direct IO access to all transfer
areas to the higher-level IO controller:
depending on the type of error han-
dling, e.g., call of OB 122 (IO access
error).
Call of OB 86 (rack failure).
During the updating of the process image
with the instructions "UPDAT_PI" and
"UPDAT_PO" an error report is returned at
the parameter RET_VAL.
With direct IO access to all transfer areas to
the I-device: depending on the type of
error handling, e.g., call of OB 122 (IO
access error).
I-device CPU is in
RUN, higher-level
IO controller is in
RUN, communi-
cation connec-
tion between IO
controller and I-
device is inter-
rupted (bus in-
terruption).
The bus connec-
tion between the
IO controller and I-
device has been
reestablished and
the I-device is
again included in
the user data traf-
fic.
Call of OB 86 (rack failure).
Call of OB 83 (pull/plug) for input
transfer areas to the higher-level IO
controller.
Until call of OB 83 in the case of di-
rect access to the input transfer areas
to the higher-level IO controller: de-
pending on the type of error han-
dling, e.g., call of OB 122 (IO access
error).
Call of OB 86 (rack failure).
Until reporting of station re-integration by
OB 86 with direct IO access to all transfer
areas to the I-device: depending on the
type of error handling, e.g., call of OB 122
(IO access error)