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Scheduling time clock

Created by: Abyrne at: 12/10/2009 11:02 AM (13 Replies)

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12/10/2009 11:02 AM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 5/25/2023 Posts: 101 Rating: (4)	Hello! I am looking for the best way to set up a weekly time clock in step7 basic and display a graphic on a hmi to allow a weekly on/off scheduling to be entered. Any ideas how this can be done? Thanks!

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12/10/2009 1:04 PM	Rate (0)
Robster Gold Expert Joined: 5/28/2008 Last visit: 5/15/2023 Posts: 1343 Rating: (139)	mh, can you describe your intensions a little bit more detailed. Don't know what you want to do exactly.

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12/10/2009 3:02 PM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 5/25/2023 Posts: 101 Rating: (4)	Thanks for the reply Robster, I am looking to control a HVAC system... a boiler plant, an air handling unit and a chiller unit. I am looking to set up a template on a hmi that would look like a 7 day plan for each unit. In this plan an On/Off time for controling when the units come on and switch off can be entered. Each unit has a digital enable signal that when activated would switch the unit on. So i am looking for a way to enter on/off times for the digital outputs of the PLC and to be able to access and edit these times from a HMI.

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12/10/2009 3:36 PM	Rate (0)
Robster Gold Expert Joined: 5/28/2008 Last visit: 5/15/2023 Posts: 1343 Rating: (139)	ok, I think I understood. So you have 3 "users" and 7 days. S7-1200 shall enable one user after another by a time schedule. Maybe in Monday user 1, on thursday user 2 and so on. Maybe 2 users at the same day. Is this right?? Best way is to take PLC internal time. The function RD_SYS_T reads system time and move them to DTL-variable. You can have access of each byte of this DTL variable (year, month, ..., day of week...). Please have a look to manual chapter 6.2.2. With this information you can build up a schedule that enables one of your systems maybe on monday from 10 - 11 a.m. and so on...

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12/10/2009 3:57 PM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 5/25/2023 Posts: 101 Rating: (4)	That is what i mean. I remember i had trouble retaining the "real time" clock on the HMI... it reset after a power down. I will try what you said with the RD_SYS_T and thanks for the reference to the manual.

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12/11/2009 9:06 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 6/5/2023 Posts: 8587 Rating: (1127)	Dear Abyrne, Perhaps the following link might help: how do you synchronize the time of the HMI Basic Panel with an S7-1200 PLC? Best regards, Wizard

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This contribution was helpful to 1 thankful Users Abyrne

3/18/2010 5:06 PM	Rate (1)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 5/26/2023 Posts: 4184 Rating: (1342)	Hi, here there is a sample project that works as scheduling time clock alarm. Attachment Clock Alarm.zip (1146 Downloads)
	Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 2 thankful Users Abyrne rajforsol

2/14/2012 1:21 PM	Rate (0)
tomasgr Posts: 1 Rating: (0)	Hello there! i am a newbie and have downloaded your sample program. Is it possible to use your alarm multiple times? eg at 06:00 at 14:00 and at 22:00? if yes then i am doing something wrong as i get a msg ,There are objects with ambiguous addresses in the program.,1,0,2:19:37 PM.
tomasgr Posts: 1 Rating: (0)
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2/15/2012 1:00 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 5/26/2023 Posts: 4184 Rating: (1342)	Hi you can combine more then one clock alarm in a digital logic (ands and ors) to make more complex scheduling.
	Denilson Pegaia Siemens Industry Sector Technical Support
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11/7/2012 5:38 AM	Rate (0)
KTMman Posts: 13 Rating: (0)	I'am trying to use this function. When I compile it says there is declaration of output to input does not match. On #Out_of_Range in network 2 Is this intended? Mark
KTMman Posts: 13 Rating: (0)
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