Operator controls and operating modes of the CPU 410-5H
7.3 Self-test
CPU 410-5H Process Automation/CPU 410 SMART
106 System Manual, 10/2013, A5E32631667-AA
In an F-system, the F-program is informed that the self-test has detected an error the first
time a checksum error occurs in STOP or in solo operation. The reaction of the F-program to
this is described in Manual
S7-400F and S7-400FH Automation Systems
.
Hardware fault with one-sided call of OB 121, checksum error, second occurrence
A CPU 410–5H reacts to a second occurrence of a hardware fault with a one-sided call of
OB 121 and to checksum errors as set out in the table below, based on the various operating
modes of the CPU 410.
Table 7- 6 Hardware fault with one-sided call of OB 121, checksum error, second occurrence
CPU in stand-alone operation
CPU in redundant operation
Hardware fault
with one-sided call
of OB 121
OB 121 is executed OB 121 is executed The faulty CPU switches to
ERROR-SEARCH operating
state. The fault-tolerant system
switches to solo operation.
Checksum errors The CPU enters the
DEFECTIVE state if two errors
occur within two successive test
cycles (configure the length of
the test cycle in HW Config).
The CPU enters the
DEFECTIVE state if two errors
occur within two successive test
cycles (configure the length of
the test cycle in HW Config).
The CPU enters the
DEFECTIVE state if a second
error triggered by the first error
event occurs in ERROR-
If a second checksum error occurs in solo or stand-alone operation after twice the test cycle
time has expired, the CPU reacts as it did on the first occurrence of the error. If a second
error (hardware fault with one-sided call of OB 121, checksum error) occurs in redundant
operation when troubleshooting is finished, the CPU reacts as it did on the first occurrence of
the error.
If a multiple-bit error is detected during redundant operation of a fault-tolerant system, the
CPU switches to ERROR-SEARCH operating state. When troubleshooting is finished, the
CPU can be linked up and updated again, and resume redundant operation. At the transition
to error-search mode, the address of the errors is reported in the diagnostics buffer.
The CPU calls OB 84 after detection and elimination of the error.
Influencing the cyclic self-test
SFC 90 "H_CTRL" allows you to influence the scope and execution of the cyclic self-test. For
example, you can remove various test components from the overall test and re-introduce
them. In addition, you can explicitly call and process specific test components.
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