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Set local time s71200

Created by: Fedenaa at: 1/28/2013 9:08 PM (12 Replies)

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1/28/2013 9:08 PM	Rate (0)
Fedenaa Posts: 33 Rating: (0)	Dear Readers, The question is this. How is it possible to change the local time of PLC? I use the CP 1242-7 to synchronize time with a NTP server. With that, I get the GMT 0. Now ... How do I set the GMT? Using the block SET_TIMEZONE need to use a block for each time zone. Inside the struct called TimeTransformationRule, the variables are not editable. Impractical approach and very expensive in memory. 96 bytes for each time zone. The idea is to change the GMT on screen at any time at any value. Of course, thank you. Attachment set_timezone.JPG (1079 Downloads)
Fedenaa Posts: 33 Rating: (0)
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1/29/2013 11:00 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/17/2025 Posts: 4394 Rating: (1463)	Hi, e.g. you don't need to call any block to set the time zone. It should be set at the HW config, CPU properties, under "Time of day". The block SET_TIMEZONE, is just needed if you need to change the open settings dynamicaly, in runtime. TIP: remember that you can read the system time (always UTC) and the local time (time zone related), each one with different blocks (RD_SYTTIME_T and RD_LOC_T).
	Denilson Pegaia Siemens Industry Sector Technical Support
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1/29/2013 12:51 PM	Rate (0)
Fedenaa Posts: 33 Rating: (0)	But that's what i want... I need to change the time dynamicaly, in runtime.
Fedenaa Posts: 33 Rating: (0)
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1/30/2013 10:36 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/17/2025 Posts: 4394 Rating: (1463)	Hi, do you want to change the time, or the time zone? (To change the time (not time zone) you should use the block WR_SYS_T. Take a look at http://support.automation.siemens.com/WW/view/en/39182145) Why do you need to change the timezone dynamically? You PLC is used in a ship or something like this? The Block SET_TIMEZONE has a input TimeZone, itis a struct with many variables. To set a new timezone,set the internal Time Zone variable, "bias" = time zone,and give a pulse in REC.
	Last edited by: Pegaia at: 1/30/2013 11:18 AM Denilson Pegaia Siemens Industry Sector Technical Support
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1/30/2013 12:59 PM	Rate (0)
Fedenaa Posts: 33 Rating: (0)	I want to change the timezone, and that struct dont allow me to change these parameters. Because of that, i have to create a lot of different structs and call a SET_TIMEZONE for each time zone.
Fedenaa Posts: 33 Rating: (0)
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1/30/2013 11:43 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/17/2025 Posts: 15541 Rating: (2465)	Fedenaa I want to change the timezone, and that struct dont allow me to change these parameters. Because of that, i have to create a lot of different structs and call a SET_TIMEZONE for each time zone. I am perplexed by the application that would need to constantly adjust the PLCs current time zone. Is this a high speed train, ISS, or something where it is moving so fast around the planet that the time zone changes during normal use? Virtually every time critical application I've worked on has GMT and local time and the plc has some configuration for time zone offset as well as summer or daylight time adjustments. Sometimes it was just simpler to set the time, have a user adjustable offset to get the displayed 'local' time to match reality. Are you targetting something with a PLC and need to know when it will land? That seems unlikely. Again, the application perplexes me. Sorry I do not quite understand the need better to offer more suggestions.
	science guy
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1/31/2013 10:34 AM	Rate (1)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/17/2025 Posts: 4394 Rating: (1463)	Fedenaa I want to change the timezone, and that struct dont allow me to change these parameters. Because of that, i have to create a lot of different structs and call a SET_TIMEZONE for each time zone. Hi, I don't understand your explanaition. I tested set bias and gave a pulse in REC and changed the time zone difference between loc and sys time without problems. you set bias by "instance DB name".TimeZone.Bias
	Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 1 thankful Users 0_Einstein

2/1/2013 12:56 PM	Rate (0)
Fedenaa Posts: 33 Rating: (0)	First of all, thank you very much for your time. This is a program that will control several machines. It is projected that these machines are not in the same country. The need to change the local time is because they are looking for a project (TIA Portal) identical for all machines. The image shows how I can not change the struct variables. So ... the only solution is to have as many SET_TIMEZONE as need time zones? Attachment set_timezone2.jpg (820 Downloads)
Fedenaa Posts: 33 Rating: (0)
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2/4/2013 10:49 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/17/2025 Posts: 4394 Rating: (1463)	Hi, Bias was defined as read only on the instance DB. I have change it by watch table, so it runs. If you can't set the value by watch table, please try to: 1 - Create your DB as standard (not optimized) 2 - Move the value in SCL by Poke instruction. Tip: I suggest you open a Support Request, relating that you can set a value to this variable. Ask for a correction o the Software.
	Denilson Pegaia Siemens Industry Sector Technical Support
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7/14/2013 7:14 PM	Rate (0)
RND Regular Member Joined: 10/2/2012 Last visit: 5/7/2022 Posts: 17 Rating: (0)	Thanks for this explanation of not needing to program the time zone instruction. I was also misled believing that we have to use: SET_TIMEZONE. However in setting up my controller simply using the timezone setup in the hardware config I am not getting the correct time for my timezone. I am on GMT+2 hours but if you look at the saved watch table the difference between Universal and Local time is 3 hours.. Can you suggest why this is so? Attachment Woodies2.zip (430 Downloads)

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