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READ ANALOQUE VALUES

Created by: REACHA11 at: 10/30/2011 10:23 PM (7 Replies)

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10/30/2011 10:23 PM	Rate (0)
REACHA11 Member Joined: 10/30/2011 Last visit: 11/4/2011 Posts: 4 Rating: (0)	HELLO TO ALL i have a cpu315 and a analoque module sm331 (8AI ;12 bits) and i want to read 3 values of thermocouple type K and 3 values of thermocouple type B , in this order i use op 27 , so i want to know the methode, is it just : L pew 256 T db100 dbx2 thanks

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10/31/2011 10:22 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/18/2018 Posts: 3711 Rating: (950)	Hi, you are in the right way. When you read thermocouples, the values comes in 10*Celsius units, directly. In OP you can read these values and set 1 decimal place for representation.
	Denilson Pegaia Siemens Industry Sector Technical Support
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11/1/2011 6:43 PM	Rate (0)
REACHA11 Member Joined: 10/30/2011 Last visit: 11/4/2011 Posts: 4 Rating: (0)	hi pegaia when i read the value in op it seems this value are not right , my question is . is there some transformation to do in the program or some fc to program in the main program or there are an other way to read the correct value? thanks

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11/1/2011 8:57 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/18/2018 Posts: 3711 Rating: (950)	Hi you should read directly, without any block. load IW 100, for example you should read 365, for 36,5 Celsius..
	Denilson Pegaia Siemens Industry Sector Technical Support
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11/3/2011 10:07 PM	Rate (0)
REACHA11 Member Joined: 10/30/2011 Last visit: 11/4/2011 Posts: 4 Rating: (0)	hi for one value it is ok , now i want to extend my project more , i want to read 36 values of 36 thermocouples ( K, B, S) and one value 4- 20 mv for pressure the probleme is i have only 2 analogue input module (sm331...) 8x12 bits ( it is means 16 input) and i don't know how i can do it , for the visualisation on op27 ( curve, historical values...) i don't know the way to storage values and curve, or substitute the op by pc . thanks .

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11/4/2011 4:04 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/18/2018 Posts: 3711 Rating: (950)	Hi, to read 36 values, you will need 36:8=4,5=>5 modules...
	Denilson Pegaia Siemens Industry Sector Technical Support
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11/4/2011 5:18 PM	Rate (0)
REACHA11 Member Joined: 10/30/2011 Last visit: 11/4/2011 Posts: 4 Rating: (0)	hello yes i know that i use 5 analogue module (8x12 bits) but i have an other idea , i use for exemple multiplixer ( cheaper) . an other question: is it possible to read 1300 °c or 1200 °c with this sm331 ( 11 bits + sign) . thnks

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11/5/2011 5:14 PM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 10/15/2018 Posts: 10192 Rating: (1141)	Hello, Yes, you can read there 1300. This depends of the type of thermocouple connected there. And I suggest you to use analog cards corresponding to the numbers of thermocouple. Best regards, Hristo Mihalev

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