GE Multilin L60, Instruction Manual

Page: 712 / 752

E-2 L60 Line Phase Comparison System GE Multilin
E.1 PROTOCOL APPENDIX E
E
When using an unbalanced link layer, the following Application Service Data Unit (ASDU) types are returned in class 2
messages (low priority) with the indicated causes of transmission:

The standard assignment of ASDUs to class 2 messages is used as follows:

A special assignment of ASDUs 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
standard.
Common Address of ASDU:

One Octet

Two Octets
Information Object Address:

One Octet

Structured

Two Octets

Unstructured

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:

– used in standard direction;

– not used;

– cannot be
selected in IEC 60870-5-104 standard.
Process information in monitor direction

<1> := Single-point information M_SP_NA_1

<2> := Single-point information with time tag M_SP_TA_1

<3> := Double-point information M_DP_NA_1

<4> := Double-point information with time tag M_DP_TA_1

<5> := Step position information M_ST_NA_1

<6> := Step position information with time tag M_ST_TA_1

<7> := Bitstring of 32 bits M_BO_NA_1

<8> := Bitstring of 32 bits with time tag M_BO_TA_1

<9> := Measured value, normalized value M_ME_NA_1

<10> := Measured value, normalized value with time tag M_NE_TA_1

<11> := Measured value, scaled value M_ME_NB_1

<12> := Measured value, scaled value with time tag M_NE_TB_1

<13> := Measured value, short floating point value M_ME_NC_1

<14> := Measured value, short floating point value with time tag M_NE_TC_1

<15> := Integrated totals M_IT_NA_1

<16> := Integrated totals with time tag M_IT_TA_1

<17> := Event of protection equipment with time tag M_EP_TA_1

<18> := Packed start events of protection equipment with time tag M_EP_TB_1

<19> := Packed output circuit information of protection equipment with time tag M_EP_TC_1

<20> := Packed single-point information with status change detection M_SP_NA_1