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Get the datatype date from a S7-300 with NodeRed

Created by: YannFuch20 at: 4/25/2019 1:26 PM (5 Replies)

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4/25/2019 1:26 PM	Rate (0)
YannFuch20 Posts: 3 Rating: (0)	Hello Siemens Community, i'm currently trying to get the datatype date from a S7-300 with NodeRed. Has anyone done this before and can show me how to do it? ------------------------------------------------------------------------------------------ Split from S7 communication with node-red.
YannFuch20 Posts: 3 Rating: (0)	Last edited by: Jen_Moderator at: 04/30/2019 07:55:19 New subject after splitting
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4/25/2019 2:19 PM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/12/2024 Posts: 3345 Rating: (379)	Hi, same behavior like using date_and_time, which is already described in this post! Just search for date in this post and you will find a post from me with a screenshot how to read it out. You have to read it out bytewise and then transfer from decimal to hex. Attached you can find a flow with an example. Best regards! Attachment date_time.txt (162 Downloads)
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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4/25/2019 3:31 PM	Rate (0)
YannFuch20 Posts: 3 Rating: (0)	I have inserted and adapted the example, but this probably doesn't work for the Date datatype. The values that come out are wrong. I have also seen that the Date datatype is only 2 bytes in size and you need 3 bytes with your example to read the date. thank you for your help :) Attachment Datatype.PNG (186 Downloads)
YannFuch20 Posts: 3 Rating: (0)	Last edited by: YannFuch20 at: 04/25/2019 15:38:35
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4/25/2019 3:52 PM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/12/2024 Posts: 3345 Rating: (379)	You're right. Sorry for my wrong guess, looked like it would be the same but it isn't. I should have had a look before on TIA online help. It is just an UINT value. You can read it out easily with one variable from the IOT2000. I am not sure which value will be returned, it could be possible that the value returned describes the days since 1990-01-01. I will try this tomorrow.. Attachment date.PNG (130 Downloads)
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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4/25/2019 4:12 PM	Rate (0)
YannFuch20 Posts: 3 Rating: (0)	You're right The number that is output describes the days that have passed since 1990-01-01. The output number is 10706. If I subtract this number in Excel from today's date, the result is 1990-01-01! Attachment excel.PNG (146 Downloads)
YannFuch20 Posts: 3 Rating: (0)
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4/26/2019 7:17 AM	Rate (1)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/12/2024 Posts: 3345 Rating: (379)	Ok, then we have to search for a formula which is calculating the current date based on that number. This formula has to be inserted to the function node. EDIT: See attached flow, should work like that. Best regards! Attachment date.txt (127 Downloads)
	Last edited by: bergmanu at: 04/26/2019 08:19:08 Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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