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Is it possible to change properties of a DB subsequently?

Created by: Dilli at: 2/2/2010 2:39 PM (6 Replies)

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2/2/2010 2:39 PM	Rate (0)
Dilli Posts: 122 Rating: (1)	is it possible to create instance data block with no "Symbolic acces only" ?
Dilli Posts: 122 Rating: (1)	Last edited by: O_Moderator at: 2/3/2010 12:16 PM new subject after splitting from /tf/WW/en/Posts/32460#top
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2/2/2010 2:59 PM	Rate (0)
Robster Gold Expert Joined: 5/28/2008 Last visit: 5/15/2023 Posts: 1343 Rating: (139)	What do you mean excactly? You can select either to create a symbolic DB or a non-symbolic DB.

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2/2/2010 3:10 PM	Rate (0)
Dilli Posts: 122 Rating: (1)	I have a functional block (eg FB55), want to create an instance data block (DB55) accesible in HMI through simatic net, the condition is to create DB55 with not only symbolic acces - when i try- the check box with "Symbolic acces only" is inactive. Attachment SRFile2010_2_2_16_8_19_359.jpg (309 Downloads)
Dilli Posts: 122 Rating: (1)
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2/2/2010 3:58 PM	Rate (0)
Robster Gold Expert Joined: 5/28/2008 Last visit: 5/15/2023 Posts: 1343 Rating: (139)	I understand. Your FB already exists. Then it is not possible to change the symbolic access for the instance DB. When you create new FB, you have to select symbolic or non-sybmbolic. You can't change it afterwards. What you can do is to create a new FB and copy all the networks and variables from the old into the new.

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2/2/2010 4:40 PM	Rate (0)
Dilli Posts: 122 Rating: (1)	Thank you Robster for advices
Dilli Posts: 122 Rating: (1)
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2/3/2010 9:09 AM	Rate (0)
Smurf Silver Member Joined: 9/28/2005 Last visit: 12/14/2022 Posts: 414 Rating: (28)	Hi Robster, My advise is to take a seperate DB for communication, because every time you change your FB interface the adresses of the variables in the instance DB would change. That results in more work, because then you have to change your HMI program as well.
	Smurf "The only difference between a problem and a solution is that people understand the solution."
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2/3/2010 10:20 AM	Rate (0)
Dilli Posts: 122 Rating: (1)	Smurf Hi Robster, My advise is to take a seperate DB for communication, because every time you change your FB interface the adresses of the variables in the instance DB would change. That results in more work, because then you have to change your HMI program as well. it depends on skills of everyone, for exemple I always change my instance db only by adding variable to end, on this way i don't touch adress of other variables
Dilli Posts: 122 Rating: (1)
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