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11. Detailed descriptions of functionality
11.1 SCADA PIN code protection
It is always possible to get read access via Modbus, but if the CU
36X control unit is SCADA PIN-code-protected
(PitStatus.ScadaPinCodeEnabled, register 00202, bit 4 = 1), write
access requires that the user has entered the correct PIN-code in
(ScadaPinCode, register 00109).
Writing the correct PIN code value will trigger the write access
control, and write access will be open, which can be verified with
the status bit PitStatus.WriteAccess (register 00202, bit 5 = 1).
To remove write access, the SCADA PIN code input register
(ScadaPinCode, register 00109) can be set with a value of 0.
The SCADA PIN code protection cannot be enabled or disabled
via Modbus.
11.2 Reading the event log
The event log has a size of 350 registers containing the latest 50
alarm and warning events. The number of contained event logs
can be read from NoOfEventsInLog (register 06001).
Each event is represented as an event record of seven registers:
• EventID
• EventCode
• EventSource
• EventDeviceNo
• EventTypeAndCondition
• EventTimeStampHI
• EventTimeStampLO.
The EventID is a unique "tag" for the event record. These IDs are
incremented successively corresponding to the succession of the
events they represent. The event log can be handled in three
ways:
• Reading the complete log (all 50 event records) regularly and
afterwards sorting "new" ones from "old" ones.
• Reading the event ID of the latest record EventLogLatestID
(register 00216) and comparing with the event ID of the latest
record that has been read previously to see how many "new"
records have been generated. Then afterwards reading only
the "new" ones.
• Clearing the event log with PitControl.ResetEventLog (register
00101, bit 2) after it has been read. Then the event log will
always contain "new" events only.
Note
The CIM module ensures that logged data is
protected against internal update during the time it is
accessed from Modbus, so that the event log
constitutes a time-consistent block (data coherency).
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