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How can setting retentive address in instant DB?

Created by: vorapob at: 9/30/2019 5:45 PM (6 Replies)

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9/30/2019 5:45 PM	Rate (0)
vorapob Gold Member Joined: 1/17/2013 Last visit: 11/9/2024 Posts: 1106 Rating: (7)	Dear Experts, I use SIMATICS Manager V5.6. How can I setting DB1.DBW0 in instant datablock is retentive address ? Best Regards, Vorapob
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9/30/2019 10:09 PM	Rate (1)
Konstantin_D Gold Member Joined: 2/24/2015 Last visit: 1/25/2023 Posts: 306 Rating: (78)	Which PLC do you use? In S7-300 the default data blocks retain their values in the retentive memory. See this.

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9/30/2019 10:32 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/11/2024 Posts: 12293 Rating: (2691)	Hello vorapob; Konstantin_D's answer is quite appropriate for standard, global DBs. If the original question concerned "instance DBs", a DB that is generated at the creation of a FB, then this document should be interesting to you: What is the difference between an instance data block and a global data block and how does a CALL call influence the DB register? https://support.industry.siemens.com/cs/ww/en/view/15360455 Note that the STAT variables in an instance dB (variables that are part of the FB code body) are totally retentive. Hope this helps, Daniel Chartier

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10/1/2019 5:22 PM	Rate (0)
vorapob Gold Member Joined: 1/17/2013 Last visit: 11/9/2024 Posts: 1106 Rating: (7)	Konstantin_D Which PLC do you use? In S7-300 the default data blocks retain their values in the retentive memory. See this. Dear Konstantin_D, I use S7-300. Is the initial value in DB is retentive value ? Best Regards, Vorapob
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10/1/2019 5:25 PM	Rate (0)
vorapob Gold Member Joined: 1/17/2013 Last visit: 11/9/2024 Posts: 1106 Rating: (7)	Dear Daniel Chartier, Thank you very much for your information. Best Regards, Vorapob
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10/2/2019 8:21 AM	Rate (1)
Konstantin_D Gold Member Joined: 2/24/2015 Last visit: 1/25/2023 Posts: 306 Rating: (78)	When you load a data block into the CPU for the first time, the values from the project become the Initial value in the PLC. After starting PLC, Initial values become Actual values. The program in the controller works with Actual values. After Warm Restart, if data is non-retentive, Initial values are loaded into Actual values. After Warm Restart, if data is retentive, Actual values do not change After Cold Restart, Initial values are loaded into Actual values.

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10/3/2019 3:56 PM	Rate (0)
vorapob Gold Member Joined: 1/17/2013 Last visit: 11/9/2024 Posts: 1106 Rating: (7)	Dear Konstantin_D, Thank you very much for your information. For my opinion on SIMATIC Manger retentive address in datablock is default value. What is the different between retentive address setting in share datablock and instant datablok? Best Regards, Vorapob
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