In a normal state the primary server carries out several processes that can be classified as point management.
Point management includes:
Data collection
Virtual point processing
Sending information to CimView
screens
If the primary server stops collecting data from one device, but is still running and communicating with the secondary computer, there is no automatic fail over.
Under these circumstances or for whatever reasons you specify, you can manually transfer point management from the primary to the secondary server.
After the transfer the:
Primary server maintains control
of processes such as:
Software
Database logging
Alarm viewer
Base control engine
Devcom
Alarm Manager (AM)
User Registration (UR)
Point Management (PTM)
Secondary server takes over point
management
To manually transfer point management from the
primary to secondary server:
Create a specific Boolean point with the same name as the device being monitored.
Call this function:
failover_data_collection()
Specify what actions should occur if the point changes from 1 to 0 through a Basic script.
Example
Your primary server is connected to a PLC for a conveyor belt called CB_PLC and a CimView screen.
You have configured a global Boolean point called CB_PLC that:
Monitors the status of the device
on the primary server
Is on standby on the secondary
server
Alerts the system manager, if it
changes from 1 to 0
The primary server stops collecting data from the CB_PLC device.
The system manager is alerted and switches data collection to the secondary server.
The secondary server takes over point management function.
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Manual redundancy overview. |
