IEC 870-5-104 Interoperability List

System definition

Control station definition (master)

Control station definition (slave)

Point-to-point

Multipoint party line

Multiple point-to-point

Multipoint star

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:

One octet

Two octets

One octet

Two octets (with originator address)

Max.length L (number of octets)

<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 bit

M_BO_NA_1

<8>: =

Bitstring of 32 bit 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_ME_TA_1

<11>: =

Measured value, scaled value

M_ME_NB_1

<12>: =

Measured value, scaled value with time tag

M_ME_TB_1

<13>: =

Measured value, short floating point value

M_ME_NC_1

<14>: =

Measured value, short floating point value with time tag

M_ME_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 event 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_PS_NA_1

<21>: =

Measured value, normalised value without quality descriptor

M_ME_ND_1

<30>: =

Single-point information with time tag CP56Time2a

M_SP_TB_1

<31>: =

Double-point information with time tag CP56Time2a

M_DP_TB_1

<32>: =

Step position information with time tag CP56Time2a

M_ST_TB_1

<33>: =

Bitstring of 32 bit with time tag CP56Time2a

M_BO_TB_1

<34>: =

Measured value, normalised value with CP56Time2a

M_ME_TD_1

<35>: =

Measured value, scaled value with CP56Time2a

M_ME_TE_1

<36>: =

Measured value, short floating point value with CP56Time2a

M_ME_TF_1

<37>: =

Integrated totals with CP56Time2a

M_IT_TB_1

<38>: =

Event of protection equipment with CP56Time2a

M_EP_TD_1

<39>: =

Packed start events of protection equipment with CP56Time2a

M_EP_TE_1

<40>: =

Packed output circuit information of protection equipment with CP56Time2a

M_EP_TF_1

<45>: =

Single command

C_SC_NA_1

<46>: =

Double command

C_DC_NA_1

<47>: =

Regulating step command

C_RC_NA_1

<48>: =

Set point command, normalized value

C_SE_NA_1

<49>: =

Set point command, scaled value

C_SE_NB_1

<50>: =

Set point command, short floating point value

C_SE_NC_1

<51>: =

Bitstring of 32 bit

C_BO_NA_1

<70>: =

End of initialization

M_EI_NA_1

<100>: =

Interrogation command

C_IC_NA_1

<101>: =

Counter interrogation command

C_CI_NA_1

<102>: =

Read command

C_RD_NA_1

<103>: =

Clock synchronization command

C_CS_NA_1

<104>: =

Test command

C_TS_NB_1

<105>: =

Reset process command

C_RP_NC_1

<106>: =

Delay acquisition command

C_CD_ NA_1

<107>: =

Test comand with time tag CP56Time2a

C_TS_TA_1

<110>: =

Parameter of measured value, normalized value

P_ME_NA_1

<111>: =

Parameter of measured value, scaled value

P_ME_NB_1

<112>: =

Parameter of measured value, short floating point value

P_ME_NC_1

<113>: =

Parameter activation

P_AC_NA_1

Remote initialization

Cyclic data transmission

Read procedure

Spontaneous transmission

Single-point information M_SP_NA_1, M_SP_TA_1, M_SP_TB_1 and M_PS_NA_1

Double-point information M_DP_NA_1, M_DP_TA_1 and M_DP_TB_1

Step position information M_ST_NA_1, M_ST_TA_1 and M_ST_TB_1

Bitstring of 32 bit M_BO_NA_1, M_BO_TA_1 and M_BO_TB_1 (if defined for a specific project)

Measured value, normalized value M_ME_NA_1, M_ME_TA_1, M_ME_ND_1 and M_ME_TD_1

Measured value, scaled value M_ME_NB_1, M_ME_TB_1 and M_ME_TE_1

Measured value, short floating point number M_ME_NC_1, M_ME_TC_1 and M_ME_TF_1

Clock synchronization

Day of week used

RES 1, GEN (time tag substituted/not substituted) used

SU-bit (summertime) used

Direct command transmission

Direct set point command transmission

Select and execute command

Select and execute set point command

C_SE ACTTERM used

No additional definition

Short pulse duration (duration determined by a system parameter in the outstation)

Long pulse duration (duration determined by a system parameter in the outstation)

Persistent output

Supervision of maximum delay in command direction of commands and set point commands

Maximum allowable delay of commands and set point commands

Mode A: Local freeze with spontaneous transmission

Mode B: Local freeze with counter interrogation

Mode C: Freeze and transmit by counter-interrogation commands

Mode D: Freeze by counter-interrogation command, frozen values reported

Counter read

Counter freeze without reset

Counter freeze with reset

Counter reset

General request

Request counter group 1

Request counter group 2

Request counter group 3

Request counter group 4

Threshold value

Smoothing factor

Low limit for transmission of measured value

High limit for transmission of measured value

Act/deact of persistent cyclic or periodic transmission of the addressed object

Transparent file

Transmission of disturbance data of protection equipment

Transmission of sequences of events

Transmission of sequences of recorded analog values

Transparent file

Background scan

Acquisition of transmission delay