Configuration
4.8 Ethernet interface
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
77
●
Event class for image memory
Selection of an event class in which only the last current values are stored in the send
buffer.
In the default setting all values of events of classes 1 and 2 are stored in the send buffer,
of class 3 only the current values (image memory procedure).
You will find details of how the image buffer and send buffer work as well as the options for
transferring data in the section Process image, type of transmission, event classes
(Page 144).
Transmission settings - IEC
Transmission settings - IEC 60870-5
●
Max. time between Select and Operate
Max. duration (seconds) between Select and Operate. For a Select command to be
transferred to the CPU and to take effect, no other frame may be sent to the station
between Select and Operate.
Permitted range: 1..65535
Default setting: 1
●
Monitoring time for connection establishment
(t
0
)
Monitoring time for the connection establishment (t
0
) in seconds. If the communications
partner does not confirm connection establishment within the monitoring time, the CP
attempts to establish the connection again.
Permitted range: 1..255
Default setting: 30
●
(t
1
)
Monitoring time in seconds for the acknowledgement of frames sent by the CP by the
communications partner. The monitoring time applies to all frames sent by the CP in I, S
and U format.
If the partner does not send an acknowledgment during the monitoring time, the CP
terminates the connection to the partner.
Permitted range: 1..255
Default setting: 15
Note
Settings on the master
When configuring the monitoring times t
1
and t
2
make sure that you make the
corresponding settings on the master so that there are no unwanted error messages or
connection aborts.
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