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Unstructured
Maximum length L (number of octets)
230
The maximum frame length per Controlled Station can be up to 255.
Application layer
Transmission mode for application data
Mode 1 (The least significant octet first), as defined in clause 4.10 of IEC 870-5-4, is
used exclusively in this companion standard
Common address of ASDU (system-specific parameter)
Two octets
One octet
Information object address (system-specific parameter)
structured
One octet
unstructured
Two octets
Three octets
Cause of transmission (system-specific parameter)
Two octets (with originator address)
One octet
Selection of standard ASDUs
Process information in monitor direction (station-specific parameter)
M_SP_NA_1
:=Single-point information
<1>
M_SP_TA_1
:=Single-point information with time tag
<2>
M_DP_NA_1
:=Double-point information
<3>
M_DP_TA_1
:=Double-point information with time tag
<4>
M_ST_NA_1
:=Step position information
<5>
M_ST_TA_1
:=Step position information with time tag
<6>
M_BO_NA_1
:=Bitstring of 32 bit
<7>
M_BO_TA_1
:=Bitstring of 32 bit with time tag
<8>
M_ME_NA_1
:=Measured value, normalized value
<9>
M_ME_TA_1
:=Measured value, normalized value
with time tag
<10>
71
Station Automation COM600 3.4
1MRS755382
IEC 60870-5-101 Slave (OPC) User's Manual
Содержание COM600 3.4
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