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Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

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258 <strong>Practical</strong> Modern <strong>SCADA</strong> Protocols: DNP3, <strong>60870</strong>.5 <strong>and</strong> <strong>Related</strong> <strong>Systems</strong><br />

Type 21 Measured, normalized value without quality<br />

INFORMATION OBJECT TYPE: 21<br />

CODE:<br />

M_ME_ND_1<br />

DESCRIPTION:<br />

Measured value, normalized value<br />

without quality descriptor<br />

VALID WITH SQ: 0, 1<br />

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

Information Object Address<br />

Value<br />

Value<br />

NVA – Normalized Value<br />

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

Information Object Address<br />

Value<br />

Value<br />

NVA Information Element 1<br />

Value<br />

Value<br />

NVA Information Element N<br />

Valid cause of transmission codes<br />

Periodic / cyclic<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 />

NVA – Normalized value

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