Configuration and operation
5.8 Notes on configuring individual functions
CP 1243-1 DNP3, CP 1243-1 IEC
Operating Instructions, 02/2014, C79000-G8976-C312-02
45
●
Monitoring time for S and U frames
(t
2
)
Monitoring time for the acknowledgment of data frames of the master by the IEC CP.
After receiving data from the master, the CP acknowledges the received data as follows:
– If the CP sends data to the master itself within t
2
, it acknowledges the data frames
received from the master during t
2
at the same time along with the sent data frame (I
format).
– The CP sends an acknowledgment frame (S format) to the master of the latest when t
2
elapses.
Permitted range: 0 ... 65535 s
Default setting: 10 s
If you enter 0 (zero), the function is deactivated.
The value of t
2
should be less than that of t
1
.
●
Idle time for test frames
(t
3
)
Monitoring time during which the IEC CP 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
3
elapses, the IEC CP sends a test/control frame (U format) to the master and
enters a message in the diagnostics buffer of the CPU.
Permitted range: 0 ... 65535 s
Default setting: 30 s
If you enter 0 (zero), the function is deactivated.
●
Difference between send and receive sequence number
The difference between the send sequence number and receive sequence number of a
frame.
The master returns the send sequence number of a frame from the CP that the sending
CP then saves as the receive sequence number. Frames whose send sequence number
is lower than the receive sequence number after the difference configured here is added
are evaluated as having been successfully transferred and are deleted from the send
buffer of the CP.
Permitted range: 1 ... 64
Default setting: 12
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