5/17/2009 5:40 PM | |
Posts: 151 Rating: (8) |
Hi ddg, Check page 13-72 and 13-73 of the manual for this. Link to the manual: http://support.automation.siemens.com/WW/view/en/28392477 Important is the characteristic of your loadcell (1, 2, 4 mV / V), and maximum resistance. The internal resolution is 65536 parts. Best Regards, SonicRanger. |
5/19/2009 11:14 AM | |
Joined: 1/4/2007 Last visit: 4/18/2024 Posts: 1111 Rating: (174)
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Dear ddg, Yes, you can use the Schenk RTN load cell(s) withthe Siwarex U module. You have to set into Siwatool the parameter“Characteristic value” to 4mV/V, because the Sensitivity is 2.85mV/V. Best regards Siwarexi |
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5/19/2009 2:17 PM | |
Posts: 261 Rating: (42) |
Thanks a lot With Warm regards ddg |
7/4/2009 8:16 PM | |
Posts: 261 Rating: (42) |
Hi Siwarexi / SonicRanger, We are commissioning the batch house with Schenk RTN load cell(s) withthe Siwarex U module. Thanks for your contribution. Now I am having with some queries
As the proposed max mV will be within 8 mV can we configure the channel as 2mV/V.? I think in this case the accuracy will be in a higher side.
L PIW 698 // Raw count from Siwarex U T DB1.DBW 12 //.. L DB1.DBD10 // RAW count in S7 Now in a weigh hopper when we select 4mV/V it is showing near13000 counts and for 2mV/V it’s near 23000. As per our thinking the count equation for 2mV/V is 2427 + (X*Y) For 4mV/V is 2427 + (Z*Y) Where Y= mV from load cell X=2Z
Please ensure our view With best regards ddg |
7/6/2009 10:15 AM | |
Joined: 1/4/2007 Last visit: 4/18/2024 Posts: 1111 Rating: (174)
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Hello ddg, 1. Your calculation is correct: The signal voltage is maximal 7.77mV with a total weight (hopper + material) of 10 tons. You can select the channel as 2 mV/V. 2. I’m not really happy with your count equation. Attached you can find my Excel calculation for the digit values. Best regards Siwarexi Attachmentdigits.zip (689 Downloads) |
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7/6/2009 12:46 PM | |
Posts: 261 Rating: (42) |
Hi Siwarexi, thanks for your reply. Thats means the operating range is 2427 to 63107. Below 2427 and above 63107 are both showing abnormal conditions of field. best regards ddg |
7/6/2009 2:07 PM | |
Joined: 1/4/2007 Last visit: 4/18/2024 Posts: 1111 Rating: (174)
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Hello ddg, Yes, the operating range is 2427 to 63107. In the range of 0 ... 2427 digits, we have a tractive force of the load cell. In the range of 63107 ... 65535 digits, we have an overload of the load cell. 2427 digits means 0% of the nominal load of the load cell. 63107 digits means 100% of the nominal load of the load cell. Best regards Siwarexi |
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7/13/2009 10:27 AM | |
Posts: 261 Rating: (42) |
Hi Siwarexi, In our one weigh hopper the Siw U (7MH4 950-2AA01) setting is 4mV/V Excitation voltage is 6 V. We are getting value by I/O communication. Now the problem is when signal value 12 mV we were getting near about 32600. When mV increases the count value goes to Zero as well as the Module shows System fault (over flow). We are not getting raw value more than this. Rather than mV/V setting which are the parameters responsible (by Siwatool U) for I/O communication? With best regards ddg |
7/13/2009 11:01 AM | |
Joined: 1/4/2007 Last visit: 4/18/2024 Posts: 1111 Rating: (174)
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Dear ddg, The Siwarex U shows a weight value only as an integer value between -32768 ... +32767. That means, if the weight value is higher than +32767, the Siwarex U module will show you 0 and the overflow-error occurs. That means, that you have to decrease the weight value below these +32767. That happens with the following steps: 1. Receive the adjustment data from the Siwarex module to Siwatool 2. Divide the adjustment weight e.g. with “2” 3. Send the adjustment data from Siwatool to the Siwarex module 4. Multiply into Step7 the weight valuewith “2”. Best regards Siwarexi |
7/13/2009 12:55 PM | |||||||||||||
Posts: 261 Rating: (42) |
Dear Siwarexi, Thanks for your reply. I am not getting your point perfectly. As per our previous discussion we consider the healthy operating range of the raw count is 2427 to 63107. (Unsigned 16 bit) It seems to be applicable for all 1mV/V; 2mv/V and 4mV/V, then please explain why we are getting 32767 as a max raw count (in a Dint field)? We fount the default scale adjustment values are
What will be the scale values for different Characteristic values by which we can get 2427 to 63107 raw count? With best regards ddg |
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7/13/2009 2:42 PM | |
Joined: 1/4/2007 Last visit: 4/18/2024 Posts: 1111 Rating: (174)
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Dear ddg, The Siwarex U module is working internal with digit-values up to 65535: - The adjustment digit-values are into the DR3, format: WORD - The current digit-value is into the DR31, format: WORD But the weight value, which you can see into Siwatool or Step7 is only an integer-value up tp 32767 (weight value into the DR31, format: INT). Where do you see a DINT-field? If you want to see the currentinternal digit-value (up to 65535)via the IO communication, you have todo: - Write “73” to the address: output-byte (0 + start-address of the Siwarex U module) - Read the digit value at the address: input-word (4 + start-address of the Siwarex U module) If you want to see the currentinternal digit-value (up to 65535)viathe SFC communication, you have to do: - Read permanently with the SFC59 the DR31 If you want to see the currentinternal digit-value (up to 65535)viathe FB45, you have to do: - You can read the internal digit value directly at the parameter “FLT_RAW1”. Best regards Siwarexi |
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7/13/2009 3:09 PM | |
Posts: 261 Rating: (42) |
It is the Dint (in S7 responsible for internal calculation.)
Thanks again With warm regards ddg |
Last edited by: ddg at: 7/13/2009 3:12 PM |
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8/21/2009 10:33 AM | |
Posts: 261 Rating: (42) |
Hi Siwarexi, It’s a great technical support from your end during this thread. We finished the job and thanking you for your support. With best regards ddg |
Last edited by: ddg at: 8/21/2009 10:34 AM |
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8/21/2009 10:56 AM | |
Joined: 1/4/2007 Last visit: 4/18/2024 Posts: 1111 Rating: (174)
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Hello ddg, Not at all! Hope to see you again in another thread ... Best regrds Siwarexi |
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