Operator controls and operating modes of the CPU 410-5H
7.3 Self-test
CPU 410-5H Process Automation/CPU 410 SMART
104 System Manual, 10/2013, A5E32631667-AA
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Self-test
Processing the self-test
The CPU executes the complete self-test program after an unbuffered POWER ON, e.g.,
POWER ON after initial insertion of the CPU or POWER ON without backup battery, and in
the ERROR-SEARCH operating state.
The self-test takes at least 15 minutes.
When the CPU of a fault-tolerant system requests a memory reset and then undergoes a
OFF/ON cycle with battery backup, it performs a self-test in spite of the battery backup.
In RUN the operating system splits the self-test routine into several small program sections
("test slices") which are processed in multiple successive cycles. The cyclic self-test is
organized to perform a single, complete pass in a certain time. The default time of 90
minutes can be modified in the configuration.
Response to errors during the self-test
If the self-test returns an error, the following happens:
Table 7- 3 Response to errors during the self-test
Hardware fault without one-sided call
of OB 121
The faulty CPU switches to DEFECTIVE state. The fault-
tolerant system switches to solo operation.
The cause of the error is written to the diagnostics buffer.
Hardware fault with one-sided call of
OB 121
The CPU with the one-sided OB 121 switches to ERROR-
SEARCH. The fault-tolerant system switches to solo
RAM/PIQ comparison error The cause of the error is written to the diagnostics buffer.
The CPU switches to the configured system or operating
The response depends on the error situation (see below).
Multiple-bit errors The faulty CPU switches to ERROR-SEARCH operating
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