3.8.1.2 Sliding window protocol and timeout settings
The link procedures are described in the standard IEC 60870-5-104/Part 5-104:
Transmission protocols – Network access for IEC 60870-5-101 using standard
transport profiles,
Chapter 4 IEC 60870-5-104 interoperability
and
Chapter 5 Secure
authentication conformance statement
.
If the IEC 60870-5-104 client disappears, the established TCP/IP socket
connection is closed by the relay or server. This occurs either as a TCP
socket keep-alive failure or as time-outs t1 and t2, whichever happens
first.
3.8.2 Secure communication settings
The secure communication settings are found under Configuration>
Communication> Protocols> Secure IEC104(n)> General.
Table 11: Secure communication settings
Setting Description
Protocol Security Mode Main selection for secure communication. Alternatives are
"Off", "On" with application authentication or "On" with both
TLS and application authentication.
Reply timeout Reply time-out in milliseconds to the authentication messag-
es before reporting a time-out error.
Exp Sesn key Chg Intv Expected session key change interval in seconds. Value "0"
indicates that an interval is not used.
Exp Sesn key Chg Cnt Expected session key change count (number of messages).
Max Sesn key Stat Cnt Maximum session key status count. Defines how many times
a master can request session key status per key change in-
terval. For security reasons, responses cease after this count.
Sec Stat Cnt Grp The IEC 60870-5-104 secure communication diagnostic coun-
ters M_IT_TC belong to the same counter group, 1...4.
Sec Stat Cnt IOA Information object address for secure communication sta-
tistic counters. The 16 counters occur sequentially starting
from this object address. No other protocol data should be
stored in this address range.
3.8.2.1 Statistic counters threshold configuration
The M_IT_TC secure communication diagnostic counters reporting over IEC
60870-5-104 are based on threshold values. The threshold for each counter can be
configured under Configuration> Communication> Protocols> Secure IEC104(n)>
Statistics Thresholds.
Vendor-specific implementation
2NGA001859 A
28 REX615
IEC 60870-5-104 Communication Protocol Manual
To Next Page
Loading...
