IEC 60870-5-104 communication protocol

Supported device types and versions

The protocol (known also as IEC 870-5-104 or IEC-104) allows reading and writing data, operating on the basis of TCP network communication. Implementation is, according to the IEC 60870-5-104 standard, as follows:

Originator ASDU address is 1 byte, it is defined as the line number.
ASDU address is 2 bytes, it is defined as the station address. ASDU addresses of all stations on one line must be different.
Cause of transmission is 2 bytes (contains also Originator ASDU address).
Information object address is 3 bytes, it is defined as an I/O tag address.
The following ASDU types are implemented in the monitoring course (from controlled station to the D2000 system and also vice-versa in balanced mode):

Table 1

ASDU type	I/O tag type
1 - Single-point information	Di, Qi (On/Off), Ai, Ci
2 - Single-point information with time tag	Di, Qi (On/Off), Ai, Ci
3 - Double-point information	Qi, Ai, Ci
4 - Double-point information with time tag	Qi, Ai, Ci
5 - Step position information	Ci, Ai *
6 - Step position information with time tag	Ci, Ai *
7 - Bitstring of 32 bits	Ci, Ai
8 - Bitstring of 32 bits with time tag	Ci, Ai
9 - Measured value, normalized value	Ai
10 - Measured value, normalized value with time tag	Ai
11 - Measured value, scaled value	Ci, Ai
12 - Measured value, scaled value with time tag	Ci, Ai
13 - Measured value, short floating-point value	Ai
14 - Measured value, short floating-point value with time tag	Ai
15 - Integrated totals	Ci, Ai
16 - Integrated totals with time tag	Ci, Ai
17 - Event of protection equipment with time tag	Ci, Ai, TiR **
18 - Packed start events of protection equipment with time tag	Ci, Ai, TiR ***
20 - Packed single-point information with status change detection	Ci, Ai
21 - Measured value, normalized value without quality descriptor	Ai
30 - Single-point information with time tag CP56Time2a	Di, Qi (On/Off), Ai, Ci
31 - Double-point information with CP56Time2a tag	Qi, Ai, Ci
32 - Step position information with CP56Time2a tag	Ci, Ai *
33 - Bitstring of 32 bits with CP56Time2a tag	Ci, Ai
34 - Measured value, normalized value with CP56Time2a tag	Ai
35 - Measured value, scaled value with CP56Time2a tag	Ci, Ai
36 - Measured value, short floating-point value with time tag CP56Time2a	Ai
37 - Integrated totals with time tag CP56Time2a	Ci, Ai
38 - Event of protection equipment with time tag CP56Time2a	Ci, Ai, TiR **
39 - Packed start events of protection equipment with time tag CP56Time2a	Ci, Ai, TiR ***
40 - Packed output circuit information of protection equipment with time tag CP56Time2a	Ci, Ai, TiR ***
241 - 64-bit floating-point value (Ipesoft & URAP implementation)	Ao
243 - 64-bit floating-point value with time tag CP56Time2a (Ipesoft & URAP implementation)	Ao
251 - Archive data values (Ipesoft's implementation)	none ****