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Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

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3.1.1.1.1<br />

Appendix D: <strong>Practical</strong>s 467<br />

3.1.1.1.2 Examples of Various Type Codes<br />

3.1.1.1.3 Type 1<br />

INFORMATION OBJECT TYPE: 1<br />

CODE:<br />

M_SP_NA_1<br />

DESCRIPTION:<br />

Single 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 SP SIQ<br />

I<br />

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

Information Object Address 1<br />

IV NT SB BL SP SIQ, Information Element 1<br />

I<br />

…..<br />

Information Object Address N<br />

IV NT SB BL SP SIQ, Information Element N<br />

I<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 />

SIQ – Single-point information with quality descriptor.

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