IEC 60870-5-101 and IEC 60870-5-104
Functions
Every independent central office operates with its own information objects while central
offices that depend on each other share information objects. The addresses (ASDU and
Information objects) do not have to be the same between two independent central offices.
If a configuration in an independent central office resets a counter then it will not be reset in
another independent central office.
Dependent and independent central offices do not exclude each other.
In the following example the central offices 1a and 1b depend on each other, also the central
offices 2a and 2b. Yet, group1 is independent from group2.
Central office 1
Central office 2
Output counters
Event
1a
1b
2a
2b
1
2
Read
Read
10124
10124
Read
Read
Reset
10124
10124
Read
Read
10124
0
+100
Read
Read
10224
100
Read
Reset
10224
Read
0
Read
Read
0
100
Read
Reset
100
Read
0
Table 33:
Operation with dependent and independent central offices
Independent central offices are configured with so-called interfaces. Each interface get its
own set of information objects, own addresses and own time-out settings.
The interfaces are configured with the following commands where (n) stands for the interface
number i.e. the central office group that shares the objects. The interface number always
starts with 1.
The maximum number of groups depends on software and device.
2.22.4
Configuration of an IEC 60870-5-101 Interface
The default value for the function of the IEC 60870-5-101 interfaces is: station (RTU).
Like that, IEC-101 interfaces can be configured as RTU.
A serial interface (console0 or console1) has to be set to the IEC 60870-5-101 mode to be then
assigned to an IEC 60870-5-101 interface.
i e c 1 0 1 | l i n e t e s t | l o o p b a c k | m o d e m | t u n n e l } >
Commands to configure an IEC 60870-5-101 interface
< s e t i e c 1 0 1 i n t e r f a c e { 1 | 2 } a t t a c h { c o n s o l e 0 | c o n s o l e 1 }
[ b a l a n c e d | u n b a l a n c e d ] >
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