Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

478 Practical Modern SCADA Protocols: DNP3, 60870.5 and Related Systems
CP24Time2a – Three Octet Binary Time
This is typically used for time tags of information objects. It is the first three octets of the
seven octet binary time element.
7 6 5 4 3 2 1 0 Octet Range
Milliseconds ms
1
2
0 .. 59,999 ms
Minutes 3 0 .. 59 min
CP16Time2a – Two Octet Binary Time
This is used for elapsed times such as for relay operating time. It is the first two octets of
the seven octet binary time element.
7 6 5 4 3 2 1 0 Octet Range
1
Milliseconds ms
2
0 .. 59,999 ms
QOI Qualifier of Interrogation
7 6 5 4 3 2 1 0
QOI
Key
QOI Qualifier of command UI8[1..7]
= Not used
= Reserved for future standard definitions
= Station interrogation – global
= Interrogation of group G, where G =
= Reserved for future standard definitions
= Reserved for special use (private range)