Date/Time Stamp - Siemens S7-300

AshleyParr · May 24, 2016

Ok then guys after a lot of looking around for an answer on this subject i feel very dizzy and amazed it appears so hard to be able to create a time stamp in Siemens!!

All i want to do is log when the filler starts, preferably in the format dd-mm-yyy hh:mm:ss . Is there an easy way to do this?

I've looked at reading the plc clock, then using time/date/time of day. All end up working okish but are not formatted, so as soon as i try to display on a screen its nonsense. Ive done something similar in AB, converting the data to strings then concatenating them

Any suggestions?

Lare · May 24, 2016

Can you use Date and Time-format, which PLC clock allready has?
You need to copy indirectly 4 ints to Date and format variable.

JOLTRON · May 24, 2016

I typically use the built in formats.

SFC1 - READ_CLK will get you the date and time in 'date_and_time' format. yyyy-mm-dd-hh:mm:ss:mmm this format makes most sense to me (and I believe to the PLC) since it reads from most significant on the left to least significant on the right. Easier to do comparisons with. This is a complex data type so not viewable in a datablock.

So you would have to break it out to 'DATE' and 'TIME_OF_DAY' formats using the built in FCs ( FC6 - 'DT to DATE', FC8 - 'DT to TOD'

I am not aware of any functions to format the date otherwise. For display purposes you could pull out month , day , year separately into their own INTs?

Lare · May 24, 2016

you can copy Date and time format to separate varibales also with using local temp memory or using AR1 / AR2

Read first PLC time to DATE and time format to L-memory (temp address with Lx)

The move from temp memory to 8 separate variables (move Lx memory to DB addresses or use indirect copy with AR1

If you have DATE_AND_Time variable on temp address with address L0 then on temp memory you have on these addresses (BCD format):
LB0 = year
LB1 = month
LB2 = day
LB3 = hour
LB4 = minute
LB5 = second
LB6 = msecond
LB7 = day of week

AshleyParr · May 24, 2016

Thanks for the replies so far guys. I already have split the DT out into bytes in a DB but have been stuggling to get this timestamp in a readable format.

I have just knocked this up but still get odd readings:

Code:

//Get PLC Clock Information
      CALL  "READ_CLK"
       RET_VAL:=MW100
       CDT    :="MiscFunctions".Filler_DT

      CALL  "DT_DATE"
       IN     :="MiscFunctions".Filler_DT
       RET_VAL:="MiscFunctions".Filler_StartDate

      CALL  "DT_TOD"
       IN     :="MiscFunctions".Filler_DT
       RET_VAL:="MiscFunctions".Filler_StartTime

Below are the returned results in a variable table
DB30.DBD 18 "MiscFunctions".Filler_StartTime TIME_OF_DAY TOD#04:39:37.312
DB30.DBW 22 "MiscFunctions".Filler_StartDate DATE D#1990-09-14

Edit: I should note that its currently 2pm here in 2016, not 1990

Ash

Lare · May 24, 2016

if you look "MiscFunctions".Filler_DT byte addresses, is there year 1990 or 2016

And of course you have checked that PLC have right time

Jeebs · May 24, 2016

If your PLC's time is synchronized then you can just use the date/time in OB1.
If your PLC's time is NOT synchronized, you can still do this, but you'll have to manually ensure the correctness of the time.

LB12: Year (00 - 99 for 1990 - 2089)
LB13: Month (01 - 12)
LB14: Day (01 - 31)
LB15: Hour (00 - 23)
LB16: Minute (00 - 59)
LB17: Second (00 - 59)
LW18: Special ->
First(most significant) 12bits: ms (000 - 999)
Last(least significant) 4 bits: Day of week (1 - 7, 1=Sunday)

All these values are in BCD.
We store these individual values as BCD, INT and combined as Date/Time so we can use whatever type we need.
To display on screens, we make an IO-field/tag per values, in your case that would be 6 IO-fields/tags.

You could always convert to Int, convert to string, concat strings in whatever sequence you need.

Quick and dirty:

Code:

Declare string[19] at DB1.DBB0
DB1.DBB0:= 19
DB1.DBB1:= 19
DB1.DBB2:= (LB14 / 16) + 48 
DB1.DBB3:= (LB14 Mod 16) + 48
DB1.DBB4:= '-'
DB1.DBB5:= (LB13 / 16) + 48 
DB1.DBB6:= (LB13 Mod 16) + 48
DB1.DBB7:= '-'
DB1.DBB8:= '2'
DB1.DBB9:= '0'
DB1.DBB10:= (LB12 / 16) + 48 
DB1.DBB11:= (LB12 Mod 16) + 48
DB1.DBB12:= ' '
DB1.DBB13:= (LB15 / 16) + 48 
DB1.DBB14:= (LB15 Mod 16) + 48
DB1.DBB15:= ':'
DB1.DBB16:= (LB16 / 16) + 48 
DB1.DBB17:= (LB16 Mod 16) + 48
DB1.DBB18:= ':'
DB1.DBB19:= (LB17 / 16) + 48 
DB1.DBB20:= (LB17 Mod 16) + 48

Results in 'DD-MM-YYYY HH:MM:SS'.
(or should at least

)

AshleyParr · May 24, 2016

Lare said:
if you look "MiscFunctions".Filler_DT byte addresses, is there year 1990 or 2016

And of course you have checked that PLC have right time

Haha yes i have 16 in the byte address & the PLC does have the correct time. That was my first check before posting

AshleyParr · May 24, 2016

Jeebs said:
If your PLC's time is synchronized then you can just use the date/time in OB1.
If your PLC's time is NOT synchronized, you can still do this, but you'll have to manually ensure the correctness of the time.

LB12: Year (00 - 99 for 1990 - 2089)
LB13: Month (01 - 12)
LB14: Day (01 - 31)
LB15: Hour (00 - 23)
LB16: Minute (00 - 59)
LB17: Second (00 - 59)
LW18: Special ->
First(most significant) 12bits: ms (000 - 999)
Last(least significant) 4 bits: Day of week (1 - 7, 1=Sunday)

All these values are in BCD.
We store these individual values as BCD, INT and combined as Date/Time so we can use whatever type we need.
To display on screens, we make an IO-field/tag per values, in your case that would be 6 IO-fields/tags.

You could always convert to Int, convert to string, concat strings in whatever sequence you need.

Quick and dirty:

Code:

Declare string[19] at DB1.DBB0 DB1.DBB0:= 19 DB1.DBB1:= 19 DB1.DBB2:= (LB14 / 16) + 48 DB1.DBB3:= (LB14 Mod 16) + 48 DB1.DBB4:= '-' DB1.DBB5:= (LB13 / 16) + 48 DB1.DBB6:= (LB13 Mod 16) + 48 DB1.DBB7:= '-' DB1.DBB8:= '2' DB1.DBB9:= '0' DB1.DBB10:= (LB12 / 16) + 48 DB1.DBB11:= (LB12 Mod 16) + 48 DB1.DBB12:= ' ' DB1.DBB13:= (LB15 / 16) + 48 DB1.DBB14:= (LB15 Mod 16) + 48 DB1.DBB15:= ':' DB1.DBB16:= (LB16 / 16) + 48 DB1.DBB17:= (LB16 Mod 16) + 48 DB1.DBB18:= ':' DB1.DBB19:= (LB17 / 16) + 48 DB1.DBB20:= (LB17 Mod 16) + 48

Results in 'DD-MM-YYYY HH:MM:SS'.
(or should at least )

Thanks. Ill take a look into that. Not quite sure why the DT to Date & TOD isnt working though

Lare · May 24, 2016

you can use BCD to int conversion instead of build in FC's, there is little bit more work thought.

JOLTRON · May 24, 2016

1990 is the default start year in the PLC. I would double check under 'PLC -> Set Time Of Day' that it is correct (if required 'take time from PG/PC').

Maybe it accidentally got reset somehow.

I attached what my 'Set Time Of Day' and results from READ_CLK (and breaking it apart) look like.

AshleyParr · May 24, 2016

Just took a screenshot, see attached

JOLTRON · May 24, 2016

https://support.industry.siemens.co...d-set-them-with-sfc0-(set_clk)?dti=0&lc=en-WW

Other guys have already explained the format, but here is something from the Siemens site

JOLTRON · May 24, 2016

Is there any value in the return code of the READ_CLK?

Can you take a screen shot of that being monitored?

AshleyParr · May 24, 2016

JOLTRON said:
Is there any value in the return code of the READ_CLK?

Can you take a screen shot of that being monitored?

See attached & no, no error value

Date/Time Stamp - Siemens S7-300

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