Skip to Content

Register Login

Default Header

(header konnte nicht geladen werden)

Navigation

analog scaling problems

Created by: Colin MacPhail at: 11/20/2009 10:14 PM (4 Replies)

Rating (0)

Thanks 0

5 Entries

11/20/2009 10:14 PM	Rate (0)
Colin MacPhail Posts: 4 Rating: (0)	Hi I'm trying to change a project in my workplace. I need to replace an existing analog input card with an analog in/output card on a Siemens S300 PLC. The problem is that the input signal is 4-20mA but the I/O card reads 0-20mA. Does anyone have any idea of some code that will turn the 0-20 into 4-20 so that I can integrate it into the original program? Thanks in advance, Colin
Colin MacPhail Posts: 4 Rating: (0)
Suggestion To thank Quote Answer

11/22/2009 1:58 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	Sure - you can do it easilly (in the sample below i assume sensor 0-10bar 4-20mA linear) Current_valu[bar] := (10bar-0bar)(Current_Code -427648/20)/(16*27648/20)
Aret Posts: 2348 Rating: (265)
Suggestion To thank Quote Answer

11/22/2009 4:34 PM	Rate (0)
Sydney Gold Member Joined: 1/4/2008 Last visit: 12/22/2025 Posts: 703 Rating: (98)	Hello, I suppose you use some linear scaling procedure tohandle an analog input values. If so, you could use the range 5529.6 - 27648 instead of 0 - 27648 as the input range for calculation. Regards Sydney

Suggestion To thank Quote Answer

11/23/2009 8:53 PM	Rate (0)
karthik_sapl Posts: 7 Rating: (0)	you can use this scale fc105 in sdandard libraray. this is the easiest way for u to do the scaling.
karthik_sapl Posts: 7 Rating: (0)
Suggestion To thank Quote Answer

11/24/2009 1:08 AM	Rate (0)
Sydney Gold Member Joined: 1/4/2008 Last visit: 12/22/2025 Posts: 703 Rating: (98)	Hello, unfortunatellythe Fc105 "Scale" from the Standard library doesn'thelpwith this, it has the input range as constants inside the block according to selection if the unipolar or bipolar is used. Regards Sydney

Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on