SiePortal

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

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

which SFC or SFB does the conversion from analog INT to REAL

4/10/2008 10:16 AM	Rate (0)
EULER1313 Posts: 86 Rating: (1)	Hi all, which SFC or SFB does the conversion from analog INT to REAL. i have an analog i/o module AI4/AO2x8/8Bit (6ES7 334-0CE00-0AA0). I WANT TO READ THE INPUT FROM CHANNEL 1 AND DEAL WITH ITAS AREAL NUMBER IN PLC..HOW CAN I PERFORM THIS TASK USING sfcS OR SFBs...
EULER1313 Posts: 86 Rating: (1)
Suggestion To thank Quote Answer

4/10/2008 11:22 AM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/13/2026 Posts: 12480 Rating: (2722)	Hello Euler; The value you will read at your Peripherical Input (PIWxxx) will be an integer value between 0 and 27648 (unscaled). if you absolutely want that value as a REAL, use LAD/FDB instructions I_DI and DI_R from the Converter instructions. Then if your PIWxxx shows 2345, your modified REAL value will be 2345.0 If you would rather (and I would highly recoment it) use a REAL scaled enginnering value in your program (0.0-100.0%, USGPM, RPM....), then look in the TI-S7 converting blocks library, use FC105 "SCALE"; you can find there also FC106 "UNSCALE" for the opposite operation (writing a scaled REAL value to an unscale integer value for the analog output). Hope this helps, Daniel Chartier

Suggestion To thank Quote Answer

4/10/2008 5:02 PM	Rate (0)
Denilson Pegaia Diamond Member Joined: 9/23/2005 Last visit: 1/12/2026 Posts: 4444 Rating: (1487)	Hi, take a look at standard library, TI S7 converting blocks, FC105 /FC106.
	Denilson Pegaia Siemens Industry Sector Technical Support
Suggestion To thank Quote Answer

4/25/2008 6:26 PM	Rate (0)
SteveA Posts: 297 Rating: (42)	The Scale and Unscale functions are very useful, but they do have a side effect. They will clip the analog value so that the result is always between the HI_LIM and LO_LIM. The raw analog input value has an overrange and underrange area, but those will be restricted to the defined range. For example, a 4-20ma input can actually measure from 1.185ma to 22.81ma. If the 4-20ma range is scaled to 0-100, then any input below 4ma will be converted to 0, and anything above 20ma will be converted to 100. SteveA
SteveA Posts: 297 Rating: (42)
Suggestion To thank Quote Answer

4/26/2008 1:43 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	If module measures current or voltage then you get 27648 for 100% and 0 for 0% (in case of bipolar signal -27648 for -100%). But if you set module measurement to PT100 (or similar) then you must divide code from module by 10(or 100 for some modules). So 2764 would be not 10% of range but 276.4 degrees Celsium. Also mention that 32767 is error code.
Aret Posts: 2348 Rating: (265)
Suggestion To thank Quote Answer

4/26/2008 4:10 PM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 1/2/2026 Posts: 731 Rating: (43)	Hi, I made an Analog Input block which uses FC105 and gives out various alarms. In which wire break and overflow. I'll post it monday when I have access to my work computer.

Suggestion To thank Quote Answer

4/28/2008 8:52 AM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 1/2/2026 Posts: 731 Rating: (43)	See my attachment. Please feel free to comment . Edit: You need to add FC105 in your program as well to use this block... Attachment Analoge_.zip (442 Downloads)
	Last edited by: Ton Verra at: 4/28/2008 8:53 AM
Suggestion To thank Quote Answer

Share this page:

Share this page on...