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reading plc time and date

4/23/2011 6:53 AM	Rate (0)
bermuda Posts: 151 Rating: (3)	hello experts i have a question please help me. in logo programming it's very easy to use weekly and daily timer to turn off or turn on a falg or qoil or... with a simple block. i want to do that with s7-300. i know that i have to use a system function block to read and store it in a data block and then i have to compare readed time from system function block with a constant time. but i don't know what system function block i have to use it for reading plc clock and date if any body have experience or sample project for this please help me . thanks alot
bermuda Posts: 151 Rating: (3)	Last edited by: bermuda at: 4/23/2011 6:55 AM
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4/23/2011 7:21 AM	Rate (0)
umencho Grandmaster Joined: 3/21/2006 Last visit: 10/16/2025 Posts: 10239 Rating: (1183)	Hello, You idea isgood -How can you read out the date and time with SFC1 (READ_CLK) and input them with SFC0 (SET_CLK)? Best regards, Hristo Mihalev
	Last edited by: O_Moderator at: 4/26/2011 9:15 AM link edited
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4/26/2011 10:12 AM	Rate (0)
miami Platinum Member Joined: 8/31/2005 Last visit: 12/16/2025 Posts: 2198 Rating: (331)	Have a look on this blocks: http://support.automation.siemens.com/WW/view/en/21669756

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4/26/2011 11:37 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/24/2025 Posts: 6885 Rating: (1368)	bermuda i want to do that with s7-300. i know that i have to use a system function block to read and store it in a data block and then i have to compare readed time from system function block with a constant time. but i don't know what system function block i have to use it for reading plc clock and date if any body have experience or sample project for this please help me . Check the following link: Handling Time of Day! Also these codes are tested,you can use MW4 , MD8 or MW12 to generate compare function as you mentioned in LOGO! [code] CALL "READ_CLK" RET_VAL:=MW0 CDT :=#test CALL "DT_DATE" IN :=#test RET_VAL:=MW4 //DATE CALL "DT_TOD" IN :=#test RET_VAL:=MD8//TIME OF DAY CALL "DT_DAY" IN :=#test RET_VAL:=MW12//DAY L MD 8 L TOD#20:49:20.000 >D S Q 0.0[/code] regards
	Demo Channel on Youtube
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4/26/2011 2:58 PM	Rate (0)
bermuda Posts: 151 Rating: (3)	hello all experts thanks my friends for all of your answers i found another way to this work we can use daily interrupts from cpu setting. thanks again
bermuda Posts: 151 Rating: (3)	Last edited by: bermuda at: 4/26/2011 2:59 PM
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8/8/2018 2:02 PM	Rate (0)
Haydoo Posts: 6 Rating: (0)	If you have an HMI connected, just use the scheduler to trigger a tag and use it in your PLC.
Haydoo Posts: 6 Rating: (0)
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