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How do i use the "Day and time" instructions?

Created by: MNielsen at: 10/12/2014 11:14 AM (4 Replies)

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10/12/2014 11:14 AM	Rate (0)
MNielsen Posts: 13 Rating: (0)	Hi What is the easiest way to make a scheduled change of an output state in the TIA portal (s7-1200 series)? I would like to have a digital output to change from 0 to 1 at a certain time of day, specified by the user in a basic panel connected to the PLC. I am sure its very simple once ill understand how to use the "date and time" instructions in the portal, but the problem is i don't... In general, its quite hard to find useable help/instructions to the TIA portal for us converting from other brands of PLCs. Where should i search such information?
MNielsen Posts: 13 Rating: (0)
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10/12/2014 3:09 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/19/2025 Posts: 6858 Rating: (1366)	MNielsen Hi What is the easiest way to make a scheduled change of an output state in the TIA portal (s7-1200 series)? I would like to have a digital output to change from 0 to 1 at a certain time of day, specified by the user in a basic panel connected to the PLC. I am sure its very simple once ill understand how to use the "date and time" instructions in the portal, but the problem is i don't... In general, its quite hard to find useable help/instructions to the TIA portal for us converting from other brands of PLCs. Where should i search such information? Hello, Have a look here: How can timers be programmed in a S7-1200 in the DTL time format? I hope this is what you are looking for, Hamid Hosseini
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10/13/2014 5:24 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/21/2025 Posts: 15549 Rating: (2467)	MNielsen Hi What is the easiest way to make a scheduled change of an output state in the TIA portal (s7-1200 series)? I would like to have a digital output to change from 0 to 1 at a certain time of day, specified by the user in a basic panel connected to the PLC. I am sure its very simple once ill understand how to use the "date and time" instructions in the portal, but the problem is i don't... In general, its quite hard to find useable help/instructions to the TIA portal for us converting from other brands of PLCs. Where should i search such information? Look at the (time) comparison blocks for LAD or just compare current or localized time against the HMI entered time. You may need to do some DTL format conversions depending on how you implement the HMI portion. You will want to look within a range of times since the date will be whatever today's date is. These DTL functions allow you to access each piece of the DTL structure so you can read the localized date (day/month/year) and update your comparison DTL tag with those same values so you are strictly looking at the time values. I hope this is useful. What have you tried so far? And yes, you are correct. It takes a bit of looking around to find DTL details. I found much more here in the forums, but once I knew enough, I was able to search more effectively in the F1-Help and device specific system manuals.
	science guy
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10/16/2014 5:54 PM	Rate (1)
TrueB Posts: 22 Rating: (6)	Hello, Just in case you or anyone else that find this post is still looking for more info, I though it would be nice to offer a small demo of SCL code for this. I find it to be far, far more readable and easy to work with then any of the other examples I have found. Below is a basic code example that does exactly what you asked for and nothing else. I've also attached an s7-1200 project. Give SCL a try. As you'll see, it's pretty easy to work with and it's power full! Code Example: //You can paste this right into a TIA Portal SCL program block. //this script will turn on an output when the local time of day reaches the operator set point. //I tried to keep it very easy to read since the main goal was to demonstrate a very easy way to //work with DTL data types. //capture the local time //you can look up the "RD_LOC_T" instruction in the help file "rdLocTStatus" := RD_LOC_T("myTimeDb".currentLocalTime); //check if the time of day is equal to or greater then the operator setpoint //the way this is written, it will stay true until midnight IF ("myTimeDb".currentLocalTime.HOUR >= "myTimeDb".operatorTimeSetpoint.HOUR) AND ("myTimeDb".currentLocalTime.MINUTE >= "myTimeDb".operatorTimeSetpoint.MINUTE) AND ("myTimeDb".currentLocalTime.SECOND >= "myTimeDb".operatorTimeSetpoint.SECOND) THEN "operatorTimeSetpointReached" := 1; ELSE "operatorTimeSetpointReached" := 0; END_IF; //when the operator setpoint has been met turn on the output //I use edge detection so that the output is only turned on once per day. IF "operatorTimeSetpointReached" AND NOT "operatorTimeSetpointReachedLastScan" THEN "output1" := 1; END_IF; //write some other code here to turn the output off based on some condition. Possibly //a time delay or process completion. It will have to be turned off eventually if you //plan on triggering it again tomorrow. //assign last scan status for edge detection "operatorTimeSetpointReachedLastScan" := "operatorTimeSetpointReached"; End Code Example Cheers Attachment s7-1200 dtl demo.zip (583 Downloads)
TrueB Posts: 22 Rating: (6)
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This contribution was helpful to 3 thankful Users AUTOMOTO21 kalarcon AutoSol2022

10/16/2014 5:58 PM	Rate (0)
TrueB Posts: 22 Rating: (6)	Code looks so bad in this forum. Please cut and paste the code example above into TIA Portal before you judge its readability. Cheers
TrueB Posts: 22 Rating: (6)
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