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5.2 Self-diagnostic function
The S20LP-station has the following self-diagnostic function.
• At initialization (at power on)
Diagnostic item Station operation abnormal
ROM BCC check Station moves into Down mode.
RAM read/write check Communications with other stations are
CPU and peripheral LSI check not possible. This state will be reset by
Station number check power off/on (SN325, T2N) or pressing
Reset switch (SN325).
Transmission parameter
(EEPROM) check
Station moves into Standby mode. In
this state, scan transmission is not
possible but message transmission is
available. Station waits for transmission
parameter setting.
• During operation
Diagnostic item Station operation abnormal
Watch dog timer check Station moves into Down mode.
Abnormal timer check
(jabber timer) check
Communications with other stations are
not possible. This state will be reset by
power off/on (SN325, T2N) or pressing
Reset switch (SN325).
Receive frame check (CRC check) Station ignores the abnormal frame.
Response check In message transmission, if response
from the target station cannot be
received, station re-sends the frame.
No signal state check If no signal state continues more than
specified time, station starts re-
configuration operation.