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D.1 OVERVIEW
When using an unbalanced link layer, the following ADSU types are returned in class 2 messages (low priority) with the
indicated causes of transmission:
The standard assignment of ADSUs to class 2 messages is used as follows:
A special assignment of ADSUs to class 2 messages is used as follows:
5.
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
stanadard.
Common Address of ADSU:
One Octet
Two Octets
Information Object Address:
One Octet
D
Two Octets
Three Octets
Cause of Transmission:
One Octet
Two Octets (with originator address). Originator address is set to zero if not used.
Maximum Length of APDU: 253 (the maximum length may be reduced by the system.
Selection of standard ASDUs:
For the following lists, the boxes indicate the following:
selected in IEC 60870-5-104 standard.
Process information in monitor direction
<1> := Single-point information
<2> := Single-point information with time tag
<3> := Double-point information
<4> := Double-point information with time tag
<5> := Step position information
<6> := Step position information with time tag
<7> := Bitstring of 32 bits
<8> := Bitstring of 32 bits with time tag
<9> := Measured value, normalized value
<10> := Measured value, normalized value with time tag
<11> := Measured value, scaled value
<12> := Measured value, scaled value with time tag
<13> := Measured value, short floating point value
<14> := Measured value, short floating point value with time tag
<15> := Integrated totals
<16> := Integrated totals with time tag
<17> := Event of protection equipment with time tag
<18> := Packed start events of protection equipment with time tag
<19> := Packed output circuit information of protection equipment with time tag
<20> := Packed single-point information with status change detection
D-2
Structured
Unstructured
– used in standard direction;
C70 Capacitor Bank Protection and Control System
APPENDIX D
– not used;
– cannot be
M_SP_NA_1
M_SP_TA_1
M_DP_NA_1
M_DP_TA_1
M_ST_NA_1
M_ST_TA_1
M_BO_NA_1
M_BO_TA_1
M_ME_NA_1
M_NE_TA_1
M_ME_NB_1
M_NE_TB_1
M_ME_NC_1
M_NE_TC_1
M_IT_NA_1
M_IT_TA_1
M_EP_TA_1
M_EP_TB_1
M_EP_TC_1
M_SP_NA_1
GE Multilin
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