ABB COM600 series 5.0 Technical Reference Manual page 66

66
COM600 series 5.0
Slave Protocols (Ethernet) and Applications Technical Refer-
ence Manual
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)
One octet
Information object address (system-specific parameter)
One octet
Two octets
Three octets
Cause of transmission (system-specific parameter)
One octet
Length of APDU (system-specific parameter)
The maximum length of the APDU is 253 (default). The maximum length may be reduced
per system.
Maximum length of APDU
per system
Selection of standard ASDUs
Process information in monitor direction (station-specific parameter)
<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
1MRS758692
Two octets
structured
unstructured
Two octets (with originator address)
M_SP_NA_1
M_SP_TA_1
M_DP_NA_1
M_DP_TA_1
M_ST_NA_1