DATETIME – Get, set and convert time

Block SymbolLicensing group: STANDARD

Function Description
The DATETIME block is intended for advanced date/time operations in the REXYGEN system.

It allows synchronization of the operating system clock and the clock of the REXYGEN system. When the executive of the REXYGEN system is initialized, both clocks are the same. But during long-term operation the clocks may loose synchronization (e.g. due to daylight saving time). If re-synchronization is required, the rising edge (off $\to$ on) at the SET input adjusts the clock of the REXYGEN system according to the block inputs and parameters.

It is highly recommended not to adjust the REXYGEN system time when the controlled machine/process is in operation. Unexpected behavior might occur.

If date/time reading or conversion is required, the rising edge (off $\to$ on) at the GET input triggers the action and the block outputs are updated. The outputs starting with ’t’ denote the total number of respective units since January 1st, 2000 UTC.

Both reading and adjusting clock can be repeated periodically if set by getper and setper parameters.

If the difference of the two clocks is below the tolerance limit settol, the clock of the REXYGEN system is not adjusted at once, a gradual synchronization is used instead. In such a case, the timing of the REXYGEN system executive is negligibly altered and the clocks synchronization is achieved after some time. Afterwards the timing of the REXYGEN executive is reverted back to normal.

For simple date/time reading use the DATE_ and TIME function blocks.

Inputs

uyear	Input for setting year $⊙$ 0.00E+00	Long(I32)
umonth	Input for setting month $⊙$ 0.00E+00	Long(I32)
uday	Input for setting day $⊙$ 0.00E+00	Long(I32)
uhour	Input for setting hours $⊙$ 0.00E+00	Long(I32)
umin	Input for setting minutes $⊙$ 0.00E+00	Long(I32)
usec	Input for setting seconds $⊙$ 0.00E+00	Long(I32)
unsec	Input for setting nanoseconds $↓$ -9.22E+18 $↑$ 9.22E+18 $⊙$ 0.00E+00	Large (I64)
SET	Trigger for setting time	Bool
GET	Trigger for getting time	Bool

Outputs

yyear	Year	Long (I32)
ymonth	Month	Long (I32)
yday	Day	Long (I32)
yhour	Hours	Long (I32)
ymin	Minutes	Long (I32)
ysec	Seconds	Long (I32)
ynsec	Nanoseconds	Long (I32)
ydow	Day of week	Long (I32)
ywoy	Week of year	Long (I32)
tday	Total number of days	Long (I32)
tsec	Total number of seconds	Long (I32)
tnsec	Total number of nanoseconds	Large (I64)
dsec	Number of seconds since midnight	Long (I32)

Parameters

isetmode	Source for setting time $⊙$ 1.00E+00	Long(I32)
	1 .... OS clock 2 .... Block inputs 3 .... The unsec input 4 .... The usec input 5 .... The unsec input, relative
igetmode	Source for getting or converting time $⊙$ 6.00E+00	Long(I32)
	1 .... OS clock 2 .... Block inputs 3 .... The unsec input 4 .... The usec input 5 .... The uday input 6 .... REXYGEN clock
settol	Tolerance for setting the REXYGEN clock [s] $⊙$ 1.0	Double (F64)
setper	Period for setting time [s] (0=not periodic) $⊙$ 0.0	Double (F64)
getper	Period for getting time [s] (0=not periodic) $⊙$ 0.001	Double (F64)
FDOW	First day of week is Sunday	Bool
	off .. Week starts on Monday on ... Week starts on Sunday
tz	Timezone $⊙$ 1.00E+00	Long(I32)
	1 .... Local time 2 .... UTC

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