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Gefran MN2-6-M-B05C on AI

Created by: aliuta2000 at: 7/6/2011 4:39 PM (7 Replies)

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7/6/2011 4:39 PM	Rate (0)
aliuta2000 Bronze Member Joined: 1/26/2007 Last visit: 8/27/2024 Posts: 123 Rating: (4)	Hello , on an AI i have the Presure , and is ok i have connected the wire and everithing is ok , but for the temperature it do not want to show me some vakue . the AI is configured to A (0-10 V input ) does somebody know something about , to help me ???? can be to B configuration??? to current??

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7/6/2011 5:23 PM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	Please explain a bit more with details of your hardware config and the sensors you use. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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7/6/2011 6:30 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/13/2024 Posts: 12282 Rating: (2683)	Hello aliuta; Basically, the instrument you are connecting has the following properties, based on the following document: http://www.meter.hu/adatlap/gefran/pdf/mn.pdf: MN2-6-M-B05C-…Melt pressure transmitter with type “J” thermocouple, 0-10Vdc output, 6-pin connector, 500 bar full scale, 0.5 % accuracy class… In order to read the output of the pressure transmitter properly in the PLC, there are 2 basic steps. These steps are valid whatever type of PLC you are using; since we have no more information on what type you are using, the examples here will be for a S7-300 PLC. If you are using another type, please tell us. 1- connect and configure the signal from the transmitter to the analog input channel. We could help you more on thisif we knew the exact part number of the AI module you are using, since each one is different. Some are configured to a 0-10V signal through the programming software, some select voltage signals through different wiring schemes, some have signal selector plugs that must be setup on the side of the module... Make sure ythat you connect the correct signal wires from your special 6-pin connector to the analog inputs on the module; check wiring diagrams for your module. Here is a document that shows you all S7-300 signal modules, with wiring diagrams and parameters available, so you could locate some information by yourself: http://support.automation.siemens.com/WW/view/en/8859629 2- scale the numeric value read from the analog channel to engineering units. Your sensor uses a 0-10V output to indicate a range of 0-500 bar. However, in a S7-300 analog input, all values in the PLC will read between 0-27648 (result of an analog-to-digital converter in the analog module). To see what this numerical value represents in engineering values (bars), use FC 105 ("SCALE") that you can locate in the TI-S7 conversion library of the program editor of Step 7. To use FC105, the following FAQ will help explain the different parameters, with their datatype . Forexample: - the IN parameter would contain the PIWxxx address of your analog channel; -the BIPOLAR input should be set to 0 (use an always false memory bit you create in OB100, for example); -the LO_LIM and HI_LIM parameters should be the extreme values of yopur engineering units, inREAL datatype:0.0 and 500.0 (bars) respectfully; -the OUT parameters contains the scaled value, it should be made a REAL datatype also. http://support.automation.siemens.com/WW/view/en/1765297 Hope this helps, Daniel Chartier

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7/7/2011 12:39 PM	Rate (0)
aliuta2000 Bronze Member Joined: 1/26/2007 Last visit: 8/27/2024 Posts: 123 Rating: (4)	for the presure sensor i have no issue with . it is working fine . the trouble is the thermocuple tip J. late in the evening i was ale to see the termocuple that was beforeto the device was RT(rezistor termal) PT std and cause was 2 termocuple to this module , and first was and is TP-I J i was not carefully check the chanel& paramenters nr for my thermocuple .. now half of issue was solved , now i need an block to read the corect temperature from this thermocuple TI-J (i will try to use FC105 ) My question is : does exist an standrad block for reading and polishing thermocuple type J?? if somobody is using is so kind to give to me to use -it ? please. now using the actual bloc an need to use ~70 to offset to corect the error, but i not sure the liniarity of thermocuple type J . Thank you a lot for your support Now for scaling i am using this : L #Eing ITD DTR L 2.764800e+004 /R L #max_Wert ITD DTR *R L #Offs ITD DTR +R T #Istw_R RND T #Istw_I
	Last edited by: aliuta2000 at: 7/7/2011 12:54 PM
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7/8/2011 3:46 AM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/13/2024 Posts: 12282 Rating: (2683)	Hello aliuta; The foillowing attachment is taken from the S7-300 Module Data manual, a very important and useful document when dealing with S7-300 IOs. http://support.automation.siemens.com/WW/view/en/8859629 It shows a tablke for the temperature transmitted by a J-type TC, and the resuting value of the analog channel. TCs are an exception in analog reading rules, in the S7 world; look at all other similar tables in chapter 5 to see this. Notice that in the J-TC table for values in degrees C, the multiplier is exactly 10. If you are read a temperature of 200 C, the reading at your PIWxxx address will be 2000. Divide by 10 and you will have your exact temperature (as an integervalue, no decimal). Same applies for negative values. You do not need top scale using FC105 for TC readings. Test it yourself, it should pose little problem. Hope this helps, Daniel Chartier

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7/25/2011 9:38 AM	Rate (0)
aliuta2000 Bronze Member Joined: 1/26/2007 Last visit: 8/27/2024 Posts: 123 Rating: (4)	dchartier Hello aliuta; The foillowing attachment is taken from the S7-300 Module Data manual, a very important and useful document when dealing with S7-300 IOs. http://support.automation.siemens.com/WW/view/en/8859629 It shows a tablke for the temperature transmitted by a J-type TC, and the resuting value of the analog channel. TCs are an exception in analog reading rules, in the S7 world; look at all other similar tables in chapter 5 to see this. Notice that in the J-TC table for values in degrees C, the multiplier is exactly 10. If you are read a temperature of 200 C, the reading at your PIWxxx address will be 2000. Divide by 10 and you will have your exact temperature (as an integervalue, no decimal). Same applies for negative values. You do not need top scale using FC105 for TC readings. Test it yourself, it should pose little problem. Hope this helps, Daniel Chartier of i divide by 10 i gat a non relaistic valaue . for Ex now is about 25 degree outside in the enviremonet , and if i divide by 10 the value of piw i get 53.8 degree C .... or i shoud divide by 10 before get the real value from the PIWxxx??? Thanks a lot
	Last edited by: aliuta2000 at: 7/25/2011 9:55 AM
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12/6/2011 9:53 AM	Rate (0)
aliuta2000 Bronze Member Joined: 1/26/2007 Last visit: 8/27/2024 Posts: 123 Rating: (4)	Now i realy do not understand ...... before i have had one PLC with AI module and read correct from thermocuple type J 2 values and other that was not correct read the temperature from other 2 thermocuple type J i have tried to add a new module to the PLC that was reading correct , and now i have all temperature not realiztic values . i do not understand why , and what happend . I took ot tha module , but also non realistic value . I ask what is the role of contact from 10 to 11 pin to Analogic input module ? Thank , and if somebody think can help me ....pleasse

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12/7/2011 3:44 PM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	Hello, Give us the Mlfb (6ES7xxx number) of the module you use please. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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