Diagnostics And Interrupt Characteristics - Siemens SIMATIC ET 200AL System Manual

Distributed i/o system

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5.2 Intelligent IO devices (I-devices)

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:

The IO controller and the I-device can exchange data with each other through the

input/output transfer areas.

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-

● OB 83 (pull/plug)

● OB 86 (rack failure)

● OB 122 (I/O access error)

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.

IO controller sample program

PROFINET with STEP 7 V15

Function Manual, 12/2017, A5E03444486-AH

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