CHAPTER 3: ETHERNET INTERFACE
IEC60870-5-104 PROTOCOL
SR3 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
3-23
⊠
Three octets.
⊠
Structured
⊠
Unstructured
2.4.
Cause of transmission:
⊠
Two octets (with originator address). Originator address is set to zero if not used.
2.5.
Maximum length of APDU.
253 in both directions (the maximum length is a fixed system parameter).
2.6.
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 3-3: Process information in monitor direction
Either the ASDUs of the set <2>, <4>, <6>, <8>, <10>, <12>, <14>, <16>, <17>, <18>,
and <19> or of the set <30> to <40> are used.
Table 3-4: Process information in control direction
Number / description
Mnemonic
⊠
<1> := Single-point information
M_SP_NA_1
□
<3> := Double-point information
M_DP_NA_1
□
<5> := Step position information
M_ST_NA_1
□
<7> := Bitstring of 32 bits
M_BO_NA_1
□
<9> := Measured value, normalized value
M_ME_NA_1
⊠
<11> := Measured value, scaled value
M_ME_NB_1
□
<13> := Measured value, short floating point value
M_ME_NC_1
⊠
<15> := Integrated totals
M_IT_NA_1
□
<20> := Packed single-point information with status change detection
M_SP_NA_1
□
<21> := Measured value, normalized value without quantity 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 bits with time tag CP56Time2a
M_BO_TB_1
□
<34> := Measured value, normalized value with time tag CP56Time2a
M_ME_TD_1
⊠
<35> := Measured value, scaled value with time tag CP56Time2a
M_ME_TE_1
□
<36> := Measured value, short floating point value with time tag CP56Time2a M_ME_TF_1
⊠
<37> := Integrated totals with time tag CP56Time2a
M_IT_TB_1
□
<38> := Event of protection equipment with time tag CP56Time2a
M_EP_TD_1
□
<39> := Packed start events of protection equipment with time tag
CP56Time2a
M_EP_TE_1
□
<40> := Packed output circuit information of protection equipment with time
tag CP56Time2a
M_EP_TF_1
Number / description
Mnemonic
⊠
<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 bits
C_BO_NA_1
