Siemens SIMATIC ET 200AL - Diagnostics and Interrupt Characteristics

Functions
5.2 Intelligent IO devices (I-devices)
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130 Function Manual, 12/2017, A5E03444486-AH
4. Call the function "further processing" in a program cycle OB, for example, in OB1.
5. Wire the function "further processing" in the program cycle OB as follows:
Figure 5-16 IO controller sample program
Result
The IO controller and the I-device can exchange data with each other through the
input/output transfer areas.
5.2.7
Diagnostics and interrupt characteristics
Diagnostics and interrupt characteristics
S7 CPUs have numerous diagnostics and interrupt functions that can, for example, report
errors or failures of lower-level IO systems. These diagnostics messages reduce down times
and simplify localization and elimination of problems.
Diagnostics options in the higher-level IO controller and in the I-device
The following diagnostics functions are available to the higher-level IO controller and the I-
device CPU:
● OB 83 (pull/plug)
● OB 86 (rack failure)
● OB 122 (I/O access error)
Note
The diagnostics messages of the I/O can be processed in the user program of the I
-
device CPU and passed on from there to the
higher-level IO controller via transfer areas.