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How to Get the Current DB Number like using this Pseudocode 'getThisDBNumber.DBX1.0'

Created by: AutoGen_4068207 at: 11/7/2024 3:16 PM (3 Replies)

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11/7/2024 3:16 PM	Rate (0)
AutoGen_4068207 Member Joined: 3/30/2022 Last visit: 11/14/2024 Posts: 2 Rating: (0)	Hello everyone, I'm trying to get the current instance's Data Block (DB) number. I have a Function Block (FB) that I want to use multiple times in the program, and I want to set multiple boolean variables within it to 0 simultaneously; for this purpose, I'm using the Move instruction. I thought about using the offset of the data block. Currently, I could solve it like this: move value 0 to`%DB1.DBW4`. But`DB1`is global. I would like it to automatically recognize which DB instance is currently active—something like`getThisDBNumber.DBW4`. Is there a way to achieve this?

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11/8/2024 7:29 AM	Rate (0)
MindFlayer Regular Member Joined: 11/13/2018 Last visit: 8/28/2025 Posts: 91 Rating: (13)	Hello AutoGen_4068207, I don't think there is any possibility of doing that in LAD or FBD. In SCL, there is a work around. More info in this FAQ.
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11/8/2024 8:10 AM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 9/5/2025 Posts: 5112 Rating: (768)	AutoGen_4068207 Currently, I could solve it like this: move value 0 to`%DB1.DBW4`. Side note. Altering FB's interface later on may ruin this bright idea. Instead of using unrelated bools an array of bools or a structure could be used and supported by a specific FC to clear it.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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11/8/2024 9:02 AM	Rate (0)
qwazee Platinum Expert Joined: 3/30/2020 Last visit: 9/5/2025 Posts: 5427 Rating: (1064)	@MindFlayer is thinking in a good direction. The S7-1200 and S7-1500 however does have some other tricks we can use. A design idea is shown in the picture. Figure 1. Using DB_ANY type. I do agree with @Jacek. There are better methods of handling the situation. The AT overlay may be helpful in this case.
	Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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