Date and time (TI081 format)
The following structure is used for date-time information exchange using Modbus protocol.
The date/time are encoded in 8 bytes as follows:
| b15 | b14 | b13 | b12 | b11 | b10 | b09 | b08 | b07 | b06 | b05 | b04 | b03 | b02 | b01 | b00 | Word |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | R4 | Y | Y | Y | Y | Y | Y | Y | Word 1 |
| 0 | 0 | 0 | 0 | M | M | M | M | WD | WD | WD | D | D | D | D | D | Word 2 |
| SU | 0 | 0 | H | H | H | H | H | iV | 0 | mn | mn | mn | mn | mn | mn | Word 3 |
| ms | ms | ms | ms | ms | ms | ms | ms | ms | ms | ms | ms | ms | ms | ms | ms | Wrod 4 |
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R4: Reserved bit (reserved by IEC870-5-4), set to 0
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Y - Years
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1 byte
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Value from 0...127 (1/1/2000 to 31/12/2127)
-
-
M - Months
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1 byte
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Value from 1...12
-
-
D - Days
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1 byte
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Value from 1...31
-
-
H - Hours
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1 byte
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Value from 0...23
-
-
mn - Minutes
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1 byte
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Value from 0...59
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ms - Milliseconds
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2 byte
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Value from 0...59999
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The following fields are in CP56Time2a standard and are considered as optional:
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WD - Week Day
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If not used, set to 0 (1 = Sunday, 2 = Monday...)
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Value from 1...7
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SU - Summertime
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If not used, set to 0 (0 = standard time, 1 = summertime)
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Value from 0...1
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iV - Validity of the information contained in the structure
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If not used, set to 0 (0 = valid, 1 = not valid or not synchronized in system)
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Value from 0...1
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This information is encoded in binary form.