Validation Of The Parcel Error Count Condition; Web Sentinel Interface; Websentinel Standard/Redundancy And Related Diagnostics - Datalogic SC6000 Installation Manual

On the Standby controller, the comparison of the local/remote data is based on a table that
summarizes the configuration of the validating rules that contains the following parameters both for
the encoders and for the presence sensors:
•
Validation procedure enabling/disabling flag.
•
Pending alarm validation filter (number of consecutive times the alarm is notified from the
Standby to the Active controller).
For more information about Diagnostics messages see the Parameters HELP in Genius.

3.3.2 Validation of the Parcel Error Count Condition

The validation of the role of the active controller is also performed by the Standby controller, based
on a parcel error count condition (comparison between Standby and Active controllers). A failure in
the validation procedure leads to the switch over.
A parcel error count condition is determined by the following parameters:
•
Max Consecutive Lost Parcels: The Standby controller recognizes n more consecutive Parcels
than the Active controller. Error number [163]
•
Max % Of Lost Parcels (Out Of 100 Parcels): The Standby controller recognizes n out of 100
Parcels counted that the Active controller has not counted. Error number [165]
These error conditions do not generate diagnostic alarms since they cannot immediately determine
whether the fault is related to the presence sensor or the encoder. The two conditions are however
registered with their specific error numbers in the debug log as cause for the switch over.
For either condition, Sentinel signals simultaneous presence sensor and encoder faults.
After the switch over is concluded, the Standby (ex-Active) controller will establish whether the fault
is due to the presence sensor or the encoder. This may not be possible for particular cases: i.e.
Encoder Timeout, PS Timeout parameter combinations; slow conveyor speeds, percentage error
count condition.

3.4 WEB SENTINEL INTERFACE

WebSentinel ignores the redundant architecture and connects only to the controller that is currently
active. This is the only practical scenario with the current implementation of WebSentinel and
means that the only possible policy for the IP address association in the event of a switch over is to
the controller redundancy role ("seen" IP address remains unchanged after switch over).

3.4.1 WebSentinel Standard/Redundancy and Related Diagnostics

The companion controllers must be configured so that their IP address is associated to their
redundancy role, this way Sentinel always "sees" the same IP address regardless of which
controller is active.
WebSentinel interfaces only to the active controller and has no knowledge about the Standby
controller and its IP address.
In the event of a switch over, WebSentinel will connect to the new active controller.
Two separate operating modes are possible: