The AI20mA configuration is built by the MC from the AI20mA sensors and
Warnings configuration. It is sent to the AI20mA that performs a consistency
check on it.
*
AI20mA-MC configuration
The MC does not start normal operation if the AI20mA is configured but not
detected at start-up.
The AI20mA normal operation supervision verifies:
*
•MC-AI20mA communication
The AI20mA sensor measurements and warnings status are requested every
FUPLA cycle and so this time has to be considered as the worst fault time
detection.
The following table describes signalling/handling of the AI20mA faults:
Faults/Errors Signalling
Level
AI20mA version HMI error message "WRONG AI20MA VERSION"
SPA event “102E50”
1
AI20mA firmware HMI error message "AI20MA NOT READY"
SPA event “102E52”
3
AI20mA HW tests HMI error message "AI20MA NOT READY"
SPA event “102E53”
3
AI20mA configuration HMI error message "AI20MA NOT READY"
SPA event “102E51”
3
AI20mA-MC
configuration
HMI error message "WRONG CONFIGURATION"
SPA event “0E43”
1
AI20mA communication
(command failure)
HMI error message "AI20MA NOT READY"
SPA event “102E54”
3
FLASH data
REF 542plus uses a FLASH device to store non-volatile data/configuration. The
MC supervises every FLASH erase/write operation checking that the FLASH status
registers. In order to protect the FLASH data against erroneous write/erase attempts,
the FLASH is write-protected which means that erroneous access will raise a SW
exception (address error). The write-protection is disabled only when valid FLASH
write/erase has to be performed. Moreover, in order to guarantee data integrity, all
data stored in FLASH is validated with size-check and checksum verification.
The following table describes signalling/handling of the FLASH faults:
124
REF 542plusREF 542plus
Multifunction Protection and Switchgear Control Unit
Operator's manual
1MRS755869
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