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VARIO BK ETH
3.8
Monitoring Functions
So that the outputs are reset in the event of an error on the network line
(e.g., faulty cable) or at the client (system crash or TCP/IP protocol stack
disconnected), one of the monitoring mechanisms
–
connection monitoring or Data Interface (DTI) monitoring
must be activated. If neither monitoring mechanism is activated, the last
process data item remains unchanged in the event of an error.
When and which monitoring function is used depends on the application
program and the safety requirements.
Monitoring Mechanisms
Monitoring mechanisms require a correctly operating network. To prevent
excessive network loads or to avoid using unreliable network operating
modes, operation in separate automation networks or connection to
another network via a firewall is recommended.
3.8.1
Connection Monitoring
Application
Connection monitoring can be used to determine whether there is still a
connection between the bus coupler (server) and the computer (client) and
whether this computer responds to requests. With this monitoring it is also
possible to detect the following error causes:
9499-040-69311
–
Cable broken, not connected or short circuited.
–
Transceiver faulty.
–
Errors or faults in the Ethernet adapter of the bus coupler or
in the client.
–
System crash of the client (workstation).
–
Error in the TCP/IP protocol stack.
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