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Building a characterizer function block in a Step 7 300 PLC

Created by: jayhart at: 11/19/2011 1:33 PM (7 Replies)

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11/19/2011 1:33 PM	Rate (0)
jayhart Member Joined: 6/29/2010 Last visit: 6/17/2024 Posts: 2 Rating: (0)	Can anyone point me toward a pre-built, characterizer (function generator) block for Step 7 300 controllers? If not, suggestions for building one would be appreciated.

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11/20/2011 5:46 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	jayhart Can anyone point me toward a pre-built, characterizer (function generator) block for Step 7 300 controllers? If not, suggestions for building one would be appreciated. Dear jayhart, Please check OSCAT S7 Basic Library for some signal generators as shown in attachment. BASIC LIB 332 S7 Best regards, Hamid Hosseini Attachment signal_generator.zip (548 Downloads)
	Demo Channel on Youtube
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11/21/2011 3:22 PM	Rate (0)
jayhart Member Joined: 6/29/2010 Last visit: 6/17/2024 Posts: 2 Rating: (0)	Thank you for your prompt response! I downloaded and installed the OSCAT library you provided. Unfortunately, there may be a problem with sematics. I referred to my requested block as a Characterizer (function generator). The library provided includes several Signal Generators, including the GEN_SIN you specified, but no characterizers. The characterizer functionality I need provides a means of programming a curve of output values related to a curve of input vlaues. IE. for any value on the input curve (X), the output is calculated from a matching point on a second curve (Y). Other manufacturers' mathematical characterizers utilize the slope equation: y=mx+b. Such examples can be found in the Siemens M353 Loop controller or Procidia. They are offered as standard function blocks also in Siemens APACS, also known as Linear Characterizers. Thank you again for the help!

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11/21/2011 7:27 PM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (153)	you will find answer in some mathematical forum, there are many numerical methods to suit your demand, but you should know by yourself. on this forum you can ask how to convert math. formula in simatic language.

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11/21/2011 7:44 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	Dear jayhart , If you want to implement a nonlinear F(x,y) function with a peice-wise linear method,you can use "NONLIN" form modular PID control package.(check section 2.1.16). Also you can find some similar functions in "Mathematical functions" in OSCAT library. Best regards, Hamid Hosseini
	Demo Channel on Youtube
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11/3/2020 3:48 PM	Rate (0)
tkleeman Posts: 4 Rating: (0)	Checkout the Technology Library>PID Control>Auxiliary Functions>Polyline for your characterization. It linearly interpolates between the 50 points. I know this is available on TIA Portal V15.1.
tkleeman Posts: 4 Rating: (0)
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11/3/2020 9:40 PM	Rate (0)
Hati Platinum Member Joined: 9/21/2012 Last visit: 11/19/2024 Posts: 4199 Rating: (474)	tkleeman Checkout the Technology Library>PID Control>Auxiliary Functions>Polyline for your characterization. It linearly interpolates between the 50 points. I know this is available on TIA Portal V15.1. You do realize, that this is a 9 year old thread, when TIA was not even on the market?

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8/2/2024 12:25 PM	Rate (0)
@AutoGen_4090565 Joined: 8/2/2024 Last visit: 8/2/2024 Posts: 1 Rating: (0)	Hi Jayhart Can you provide with example how this block works Regards G

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