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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 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
REACHA11 Posts: 4 Rating: (0)
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10/31/2011 10:22 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/17/2025 Posts: 4394 Rating: (1463)	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 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
REACHA11 Posts: 4 Rating: (0)
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11/1/2011 8:57 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/17/2025 Posts: 4394 Rating: (1463)	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 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 .
REACHA11 Posts: 4 Rating: (0)
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11/4/2011 4:04 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/17/2025 Posts: 4394 Rating: (1463)	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 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
REACHA11 Posts: 4 Rating: (0)
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11/5/2011 5:14 PM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 1/14/2025 Posts: 10239 Rating: (1182)	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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