Skip to Content

SiePortal

The integrated platform for your product selection, buying and support workflow - bringing together Industry Mall and Online Support.

SiePortalDeutsch

Search

Home
Support Support
{{(apiData.Support | filter:{'rank':1}:true)[0].title}} Support
- Menu temporary not available
- Menu temporary not available
- Menue temporary not available
- {{item.title}}

Products & Services
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Support Support
{{(apiData.Support | filter:{'rank':1}:true)[0].title}} Support
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
MySiePortal MySiePortal
{{(apiData.MySiePortal | filter:{'rank':1}:true)[0].title}} MySiePortal
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Cart ({{apiData.CartCount}})

Navigation

HELP!!!!!Tell me how to calculate log.

Created by: AnproScott at: 1/25/2008 9:35 AM (7 Replies)

Rating (2)

Thanks 1

8 Entries

1/25/2008 9:35 AM	Rate (0)
AnproScott Advanced Member Joined: 5/31/2007 Last visit: 9/18/2024 Posts: 90 Rating: (2)	We have theLN and EXP Math instructions in S7 Manager. I want to calculate the "log" Math ,and I do not find any relative instruction. Can anybody help me that how to do the log calculation?? Please give me the example code!..................... Thank you so much. by SexDriver

Suggestion To thank Quote Answer

1/25/2008 4:31 PM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 11/7/2024 Posts: 4780 Rating: (729)	First - I won't comment your request... Second - hint 1 - there's no other log instruction in Step7 (but you could have a look at S5-S7 converting lib - some interesting FCs are there) hint 2 - google for "logarithm" or use wikipedia.
	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
Suggestion To thank Quote Answer

1/28/2008 8:47 AM	Rate (0)
Aret Posts: 2348 Rating: (264)	Well, generally there is 1 rule: lg_a(b) = lg_c(b)/lg_c(a) you can use almost any positive numbers instead a,b,c (excluding 0 and 1)
Aret Posts: 2348 Rating: (264)	Last edited by: Aret at: 28.01.2008 08:49
Suggestion To thank Quote Answer

1/30/2008 9:02 AM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 11/7/2024 Posts: 4780 Rating: (729)	Aret Well, generally there is 1 rule: lg_a(b) = lg_c(b)/lg_c(a) you can use almost any positive numbers instead a,b,c (excluding 0 and 1) For sure b CAN be equal to 1.
	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
Suggestion To thank Quote Answer

1/31/2008 12:18 PM	Rate (0)
wolpi@ts Silver Member Joined: 3/6/2006 Last visit: 9/13/2024 Posts: 369 Rating: (101)	You need a result like shown in the hardcopy of the scl-state-screen? The SCL-Code for the LOG-function is res := LOG (in) The SCL-Code for the LN-function is res := LN (in) AWL-Code, generated by SCL-Compiler in the next issue Thomas Attachment Log_Ln_SCL.GIF (1169 Downloads)

Suggestion To thank Quote Answer

1/31/2008 12:22 PM	Rate (0)
wolpi@ts Silver Member Joined: 3/6/2006 Last visit: 9/13/2024 Posts: 369 Rating: (101)	This is S7-code, generated by SCL-Compiler from the LOG-command. The results are shown in the item above. Attachment Log_AWL.GIF (968 Downloads)

Suggestion To thank Quote Answer

1/31/2008 12:23 PM	Rate (0)
wolpi@ts Silver Member Joined: 3/6/2006 Last visit: 9/13/2024 Posts: 369 Rating: (101)	And this is the code for ln-command Attachment Ln_AWL.GIF (801 Downloads)

Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users AutoGen_7370286

5/16/2024 1:41 PM	Rate (2)
Rafa_Reis Member Joined: 2/17/2020 Last visit: 5/16/2024 Posts: 1 Rating: (2)	To calculate the LOG in Tia Portal, you can do it as follows: LOG(X) = LN(X)/LN(10)

Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on