Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

468 Practical Modern SCADA Protocols: DNP3, 60870.5 and Related Systems
Type 2
INFORMATION OBJECT TYPE: 2
CODE:
M_SP_TA_1
DESCRIPTION:
Single-point information with time tag
VALID WITH SQ: 0
Information Object for SQ = 0 (Sequence of Information Objects)
Information Object Address
IV NT SB BL SP SIQ
I
CP24Time2a
Three-octet binary time
Valid Cause of Transmission Codes
Spontaneous
Requested
Return of information caused by remote command
Return of information caused by local command
Notes
SIQ – Single-point information with quality descriptor.
3.1.1.1.4 Type 3
INFORMATION OBJECT TYPE: 3
CODE:
M_DP_NA_1
DESCRIPTION:
Double-point information without time tag
VALID WITH SQ: 0, 1
Information Object for SQ = 0 (Sequence of Information Objects)
Information Object Address
IV NT SB BL DPI DIQ – Double Point with quality
Information Object for SQ = 1 (Sequence of Information Elements)
Information Object Address
IV NT SB BL DPI DIQ, Information Element 1
IV NT SB BL DPI DIQ, Information Element N