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Step 7. Analog input 32767

Created by: sergy.ur.popov at: 6/10/2020 8:35 AM (4 Replies)

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6/10/2020 8:35 AM	Rate (0)
sergy.ur.popov Posts: 8 Rating: (1)	Good afternoon. This problem has an analog signal from the analog module WAGO 750-466 via Profibus in CPU 315-2DP. 4-20 mA 0-32767. the FC105 Function is not able to scale values higher than 27648. It simply stops running when the signal is greater than the value 27648. But I need exactly 0-27648. How do I scale an analog signal in Step 7 ??? There is nothing like this in the module settings. How to do this programmatically.???
sergy.ur.popov Posts: 8 Rating: (1)
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6/10/2020 9:39 AM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 1/14/2026 Posts: 5155 Rating: (772)	Convert it using INT_TO_DINT, then DINT_TO_REAL and finally look there.
	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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This contribution was helpful to 1 thankful Users AmolGaikwad1200

6/10/2020 11:09 AM	Rate (0)
sergy.ur.popov Posts: 8 Rating: (1)	What you described is clear to me. But are there any standard functions in Step 7???
sergy.ur.popov Posts: 8 Rating: (1)
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6/10/2020 11:58 AM	Rate (0)
Duris_I Diamond Member Joined: 4/28/2015 Last visit: 11/27/2025 Posts: 10970 Rating: (844)	Hello, eeehm I see this problem as not Siemens but general math problematic. Check web how to do that...
	With best regards... Ivan Duris Flight: OMICO
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6/10/2020 1:19 PM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 1/14/2026 Posts: 5155 Rating: (772)	sergy.ur.popov What you described is clear to me. But are there any standard functions in Step 7??? Yes. Scale and Unscale (or something similar). But they only support Siemens convention, i.e. 27648 ~ 100% (full range) - maybe in order to discourage using non-Siemens IO modules. And it seems it works.
	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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