Siemens CPU 410-5H Process Automation User Manual

Operator controls and operating modes of the CPU 410-5H
7.3 Self-test
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
105
Hardware fault with one-sided call of OB 121
If a hardware fault occurs with a one-sided OB 121 call for the first time since the previous
POWER ON without battery backup, the faulty CPU switches to ERROR-SEARCH operating
state. The fault-tolerant system switches to solo operation. The cause of the error is written
to the diagnostics buffer.
RAM/PIQ comparison error
If the self-test returns a RAM/PIQ comparison error, the fault-tolerant system exits the
redundant operating state and the standby CPU switches to ERROR-SEARCH operating
state (in default configuration). The cause of the error is written to the diagnostics buffer.
The response to a recurring RAM/PIQ comparison error depends on whether the error
occurs in the subsequent self-test cycle after troubleshooting or not until later.
Table 7- 4 Response to a recurring comparison error
Comparison error recurs ...
Reaction
in the first self-test cycle after troubleshooting The standby CPU first switches to ERROR-
SEARCH and then to STOP.
The fault-tolerant system switches to solo
operation.
after two or more self-test cycles after
troubleshooting
Standby CPU switches to ERROR-SEARCH.
The fault-tolerant system switches to solo
operation.
Checksum errors
When a checksum error occurs for the first time since the last POWER ON without battery
backup, the system reacts as follows:
Table 7- 5 Reaction to checksum errors
Time of detection
System response
During the startup test after
POWER ON
The faulty CPU switches to DEFECTIVE state.
The fault-tolerant system switches to solo operation.
In the cyclic self-test
(STOP or solo operation)
The error is corrected. The CPU remains in STOP operating state or
in solo operation.
In the cyclic self-test
(redundant system state)
The error is corrected. The faulty CPU switches to ERROR-SEARCH
operating state.
The fault-tolerant system switches to solo operation.
In the
ERROR-SEARCH operating
state
The faulty CPU switches to DEFECTIVE state.
Single-bit errors
The CPU calls OB 84 after detection and elimination of the error.
The cause of the error is written to the diagnostics buffer.

Siemens CPU 410-5H Process Automation Specifications

General

Brand	Siemens
Model	CPU 410-5H Process Automation
Category	Controller
Language	English