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Configuration (WBM)
4.20 Telecontrol
Note
Values for the frame monitoring time and monitoring time for S and U frames
With a high encryption depth of the VPN connection higher values for t
may be necessary if the communication mode "Always remain connected" is configured.
● t
Idle time for test frames
Monitoring time during which the RTU has not received any data from the master. This
parameter is intended for situations in which longer idle periods occur; in other words,
times when there is no data traffic.
When t
a message in its diagnostics buffer.
Permitted range: 0 .. 65535 s
Default setting: 30 s
If you enter 0 (zero), the function is deactivated.
The value of t
● w
Maximum number of received data frames (I-APDUs), after which the oldest received
data frame must be acknowledged.
Permitted range: 1 .. 65535
Default setting: 8
● k
Maximum number of unacknowledged data frames (I-APDUs)
If k is reached and t
data has been acknowledged by the master.
When k is reached and t
Permitted range: 1 .. 12
Default setting: 12
● Discard events as long as the time of day is invalid.
If the option is enabled the values of data points configured as an event will be discarded
until the time of day of the RTU is synchronized or set.
This may be the case, for example, during startup of the RTU.
Acknowledgment
Mechanism:
With each sent data frame, the RTU sends a continuous send sequence number. The data
frame remains initially stored in the send buffer.
182
3
elapses, the RTU sends a test/control frame (U format) to the master and enters
3
should be higher than that of t
3
has not yet elapsed, the RTU does not send any data until all sent
1
.
1
has elapsed, the TCP connection is terminated.
1
Operating Instructions, 09/2017, C79000-G8976-C382-04
- t
(e.g. 60 s)
1
2
RTU3030C
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