System time

2020-02-27T22:56:31.341000Z

Indeed the project was an appendix for our rather big article in Russian . It would be rather difficult to translate it to English completely .

The project file comments translation would bring you nothing since the library includes the same functions with English comments.

Main functions:

Input: DATE; Output: year, month, day of the month
Input: TIME; Output: hour, minute, second, ms
Input: year, month, day of the month; Output: DATE
Input: hour, minute, second, ms; Output: TIME

Input: DATE, TIME_OF_DAY; Output: TD
Input: TOD1, TOD2; Output: TIME
Input: UINT 2 digits year; Output: UINT 4 digits year
Input: UINT year; Output: BOOL
Input: DATE; Output: UINT weekday number
standard RTC realization example, based on TON

Outer functions are only auxiliary for main functions.

Conversions based on fast algorithms without cycles.

Just tell me if you have problems to understand some functions or algorithms. I will try to describe it in details.

System time

2020-02-27T22:56:29.749000Z

Thanx

I have downloaded but I have a problem. I don't know Russian (only few words I know are something like ya tebya lyublyu for my girlfriend )

Big procent of that lib I figured out what is going on inside but not all.

have you some version in english?

System time

2020-02-27T22:56:25.254000Z

You are right. It is good solution for emulation mode.

By the way, you may download our free TimeExp.lib http://www.prolog-plc.ru/docs/timeexp.zip includes effective date and time manipulation functions.

System time

2020-02-27T22:56:23.645000Z

I realize it!

It is simple.

Just used RTC block.

It has 4 variables:

enable

InputDateAndTime as DT

Q as bool

OutDateAndTime as DT

As soon as EN becomes TRUE, the time of InputDateAndTime is set, is counted up in seconds and returned in OutDateAndTime as long as EN is TRUE. As soon as EN is reset to FALSE, OutDateAndTime is reset to the initial value DT#1970-01-01-00:00:00.

InputDateAndTime can be left out and than time and date are readen from the System.

Finally.

System time

2020-02-27T22:56:19.137000Z

I'm just a student and I don't have PLC.

I'm doing some project for my exam and I need to make ST program only for virtual PLC.

I have ST program, visualization and that's it.

System time

2020-02-27T22:56:17.530000Z

cica_draza hat geschrieben:
... I don't have library SysLibRtc.lib.

Indeed, System Libs are external libraries with realizations inside runtime system.

If yours PLC has RTC and manufacturer (OEM) support appropriate library then CoDeSys Library Manger will discover SysLibRtc.lib without any trick.

OEM may develop specialized library for system time access.

The questions are:

Does yours PLC have RTC hardware?

How OEM supports the RTC?

System time

2020-02-27T22:56:12.976000Z

Thanx for reply but I don't have library SysLibRtc.lib.

I search whole 3s folder but cannot find it. Can you post it here or mail it to me? Please?

Maybe some other way?

Please help my deadline is comming...

System time

2020-02-27T22:56:11.259000Z

Originally created by: Gast

try

ActDateAndTime := SysRtcGetTime(dummy);

with ActDateAndTime as DT

and dummy as BOOL.

SysRtcGetTime ist a function from SysLibRtc.lib

System time

2020-02-27T22:56:09.616000Z

Please help.

I don't know how to read System date and time. I supose that SysLibTime.lib is answer but I don't know how to use this library.

I would like to set value in variable X of system date and time in ST.

Thanx.

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