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PCL
Pleiger Elektronik GmbH & Co. KG
www.pleigerelektronik.de
Fon +49 2324 398 333
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Pleiger Control Loop
Manual version 2018-03
10.5 Selftest function of PCL-System
10.5.1 Basics
Due to the highly redundant system architecture several faults will not cause any disturbance and will
not be noticed during normal operation like for example the interruption of a power loop. The selftest
helps to detect and locate errors that are covered by this redundancy.
NOTICE
Selftest can’t be started
In case of an existing system error the “START SELFTEST” button is not shown, the
selftest can’t be started!
The busmaster performs the following steps during selftest:
Step Meaning
1
Check that system has no system error
2
Break power loop on one side
3
30s checking connection to nodes (power loop test)
4
If an error was detected, the selftest procedure will be stopped at that point!
5
Close power loop again, stop polling data bus at one side
6
30s checking connection to nodes (data loop test)
7
Start polling again (Reset all timeout counters to initial values)
8
Selftest finished
→
detected errors are visualized!
CAUTION
Error detection
The selftest is the only way to detect hidden faults.
It must be performed regularly at least once a month.
If any error is detected during the selftest procedure the system
must
be repaired
(even if it works properly after the test is finished)!
WARNING
Danger / Malfunction
If there is a hidden fault, one or more drives cannot be controlled or monitored during
the selftest is running. Spring close drives may close unintentionally. This must be
taken into consideration before a selftest is performed.