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novaNet OPC Server
A3
Operation sequence
3.1.2.1.2 On registration of a non-presence of an automation station
An automation station is being registered to be offline if it has not responded on a
'CheckAlive' request or the writing request was failing.
Step
1
A3.1.3
Step
Description
State of the AS
No response on the 'CheckAlive' request or a failed write
request
OnLine = 0
OffLine =-1
Disconnection
Description
Router state
1
Manual termination of the connection with writing 0 to the
item [Router].Connect.
OnLine = -1
OffLine =0
2
3
4
Actualisation of status in all automation stations (OnLine = 0)
Terminates all running requests
Closes the communication port
« Connected »
« Disconnecting… »
OnLine = 0
OffLine =0
« Disconnected »
A3.1.4
Connection error
The registration of a connection error is retrying the running transaction up to 10 times
or for a maximum time of 30 seconds.
If no response is received the sequence to terminate the connection is executed and
after 5 seconds the sequence for a new reconnection will be started. As long the item
Connect is -1 the re-connection will by tried continuously.
Step
1
Description
Not recovering connection error
Router state
OnLine = 0
OffLine =-1
« Disconnected »
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7001063003 T3
Sauter Systems