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Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

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Fundamentals of IEC <strong>60870</strong>-5 241<br />

Type 3 Double-point without time<br />

INFORMATION OBJECT TYPE: 3<br />

CODE:<br />

M_DP_NA_1<br />

DESCRIPTION:<br />

Double-point information without time tag<br />

VALID WITH SQ: 0, 1<br />

Information Object for SQ = 0 (Sequence of Information Objects)<br />

Information Object Address<br />

IV NT SB BL DPI DIQ – Double point with quality<br />

Information Object for SQ = 1 (Sequence of Information Elements)<br />

Information Object Address<br />

IV NT SB BL DPI DIQ – Information element 1<br />

IV NT SB BL DPI DIQ – Information element N<br />

Valid cause of transmission codes<br />

Background scan<br />

Spontaneous<br />

Requested<br />

Return of information caused by remote comm<strong>and</strong><br />

Return of information caused by local comm<strong>and</strong><br />

Interrogated by station interrogation<br />

Interrogated by group G interrogation, G= <br />

Notes<br />

DIQ – Double-point information with quality descriptor

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