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Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

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Fundamentals of IEC <strong>60870</strong>-5 267<br />

8.7.2 System information in control direction<br />

Type 100 Interrogation comm<strong>and</strong><br />

INFORMATION OBJECT TYPE: 100<br />

CODE:<br />

C_IC_NA_1<br />

DESCRIPTION:<br />

Interrogation comm<strong>and</strong><br />

VALID WITH SQ: 0<br />

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

Single information object only.<br />

Information Object Address<br />

UI8<br />

IOA = 0<br />

QOI – Qualifier of Interrogation<br />

Valid cause of transmission codes<br />

In control direction<br />

Activation<br />

Deactivation<br />

In monitor direction<br />

Activation confirmation<br />

Deactivation confirmation<br />

Activation termination<br />

Unknown type identification<br />

Unknown cause of transmission<br />

Unknown common address of ASDU<br />

Unknown information object address<br />

Notes<br />

QOI – Qualifier of Interrogation

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