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Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

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

IEEE STD 754 – Short floating point number<br />

Types 14, 36 Measured short FP number with time<br />

INFORMATION OBJECT TYPE: 14, 36<br />

CODE:<br />

M_ME_TC_1, M_ME_TF_1<br />

DESCRIPTION:<br />

Measured value, short floating point<br />

number with time tag<br />

VALID WITH SQ: 0<br />

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

Information Object Address<br />

Fraction<br />

Fraction<br />

IEEE STD 754 Short Floating Point<br />

Number<br />

Ex<br />

S<br />

IV NT SB<br />

Fraction<br />

Exponent<br />

BL OV QDS – Quality Descriptor<br />

CP24Time2a or CP56Time2a<br />

Three or seven-octet binary time<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 />

IEEE STD 754 – Short floating point number<br />

Type 14 has three-octet time. Type 36 has seven-octet time

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