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Siemens SIMATIC CPU 410 User Manual

Siemens SIMATIC CPU 410
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System and operating states of the CPU 410
7.3 Self-test
CPU 410 Process Automation/CPU 410 SMART
114 System Manual, 05/2017, A5E31622160-AC
7.3
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 duration of the self-test is approximately 7 minutes.
In a fault-tolerant system, if the CPU calls for a memory reset and a buffered Power Off/On is
then carried out, the CPU performs a self-test even though it was buffered.
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. This time interval is at least
90 minutes and can be extended in the configuration to reduce the impact of the self-test on
the runtime of the user program. However, it also extends the time interval in which a
possible error is detected.
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
Type of error
System response
Hardware fault The faulty CPU switches to DEFECTIVE state. Fault-tolerant
system switches to stand-alone operation.
The cause of the error is written to the diagnostics buffer.
Hardware fault, which is signaled via
a one-sided OB 121 call
The CPU with the one-sided OB 121 switches to ERROR-
SEARCH. Fault-tolerant system switches to stand-alone
operation (see below).
RAM/PIQ comparison error The cause of the error is written to the diagnostics buffer.
The configured system or operating state is assumed (see
below).
Checksum errors
The response depends on the error situation (see below).
Multiple-bit errors The faulty CPU switches to ERROR-SEARCH operating
state.
Hardware fault with one-sided OB 121 call
If a hardware fault occurs that triggers a one-sided OB 121 call and this fault occurs for the
first time since the last unbuffered POWER ON, the faulty CPU switches to ERROR
SEARCH operating state. The fault-tolerant system switches to stand-alone operation. The
cause of the error is written to the diagnostics buffer.

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Siemens SIMATIC CPU 410 Specifications

General IconGeneral
BrandSiemens
ModelSIMATIC CPU 410
CategoryControl Unit
LanguageEnglish

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