Interoperability - GE 869 Communications Manual

CHAPTER 6: IEC 60870-5-104

Interoperability

869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE
GROUPS OF DATA
The data is organized into groups in order to provide values when the controlling station
requests them by a general or group interrogation.
Group 1 is set by the 96 Single Points (M_SP).
Group 2 is set by the 32 Measured values (M_ME).
Group 3 is set by the 32 Measured thresholds (P_ME).
These 96 Single Points and 32 Measured Values are also sent as a response to a General
Interrogation.
The Integrated Totals (M_IT) has its own Counter Group 1, and it is sent as a response to a
General Request Counter.
This document is adapted from the IEC 60870-5-104 standard. For this section the boxes
indicate the following: ⊠ – used in the standard direction; □– not used.
IEC 60870-5-104 Interoperability Document
System or device:
□ System definition.
□ Controlling station definition (master).
⊠ Controlled station definition (slave).
Application layer:Transmission mode for application data:Mode 1 (least significant octet
first), as defined in Clause 4.10 of IEC 60870-5-4, is used exclusively in this companion
standard.Common address of ASDU:
⊠ Two octets.Information object address:
⊠ Three octets.
⊠ Structured
⊠ Unstructured
Cause of transmission:
⊠ Two octets (with originator address). Originator address is set to zero if not
used.Maximum length of APDU.253 in both directions (the maximum length is a fixed
system parameter).Selection of standard ASDUs.For the following lists, the boxes indicate
the following:⊠ – used in standard direction;
□ – not used.
Process information in monitor direction:
Table 6-1: Process information in monitor direction
Number / description
⊠ <1> := Single-point information
□ <3> := Double-point information
□ <5> := Step position information
□ <7> := Bitstring of 32 bits
□ <9> := Measured value, normalized value
⊠ <11> := Measured value, scaled value
□ <13> := Measured value, short floating point value
⊠ <15> := Integrated totals
□ <20> := Packed single-point information with status change detection
□ <21> := Measured value, normalized value without quantity descriptor
⊠ <30> := Single-point information with time tag CP56Time2a
INTEROPERABILITY
Mnemonic
M_SP_NA_1
M_DP_NA_1
M_ST_NA_1
M_BO_NA_1
M_ME_NA_1
M_ME_NB_1
M_ME_NC_1
M_IT_NA_1
M_SP_NA_1
M_ME_ND_1
M_SP_TB_1
6-3