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EM231 Analog input module calibration

Created by: ionut.b at: 4/19/2010 12:36 PM (6 Replies)

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4/19/2010 12:36 PM	Rate (0)
ionut.b Posts: 289 Rating: (3)	I am using EM231 (4XAI) module and SITRANS Z pressure sensors (4..20mA 2wire). Compared to a high precision pressure sensor the value measured by EM231 differes a little (both zero and span). What would be the procedure/order for correct calibration of EM231 module and pressure sensor (has a ZERO and SPAN potentiometer inside). EM 231 has only GAIN potentiometer. Instead of a current source for calibration, I use EM 232 module (4XAQ) - current output. Is this method ok ? Thank you.
ionut.b Posts: 289 Rating: (3)
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4/20/2010 8:24 AM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/9/2025 Posts: 2957 Rating: (243)	Hello, Isn't it enough info from s7-200 system manual ? Input Calibration The calibration adjustments affect the instrumentation amplifier stage that follows the analog multiplexer (see the Input Block Diagram for the EM 231 in Figure A-17 and EM 235 in Figure A-19). Therefore, calibration affects all user input channels. Even after calibration, variations in the component values of each input circuit preceding the analog multiplexer will cause slight differences in the readings between channels connected to the same input signal. To meet the specifications, you should enable analog input filters for all inputs of the module. Select 64 or more samples to calculate the average value. To calibrate the input, use the following steps. 1. Turn off the power to the module. Select the desired input range. 2. Turn on the power to the CPU and module. Allow the module to stabilize for 15 minutes. 3. Using a transmitter, a voltage source, or a current source, apply a zero value signal to one of the input terminals. 4. Read the value reported to the CPU by the appropriate input channel. 5. Adjust the OFFSET potentiometer until the reading is zero, or the desired digital data value. 6. Connect a full-scale value signal to one of the input terminals. Read the value reported to the CPU. 7. Adjust the GAIN potentiometer until the reading is 32000, or the desired digital data value. 8. Repeat OFFSET and GAIN calibration as required.
	Best regards, Darius
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4/20/2010 9:45 AM	Rate (0)
ionut.b Posts: 289 Rating: (3)	Thank you Darius, I am asking about the method of using an analog output module to calibrate an analog input module.
ionut.b Posts: 289 Rating: (3)
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4/21/2010 7:43 AM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/9/2025 Posts: 2957 Rating: (243)	Hello, This method is good in any case. If you use AO module for setting 4mA and 20mA it ok to use this method.
	Best regards, Darius
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4/21/2010 11:18 PM	Rate (0)
ionut.b Posts: 289 Rating: (3)	Thank you Darius for your opinion.
ionut.b Posts: 289 Rating: (3)
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4/26/2010 8:05 AM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/9/2025 Posts: 2957 Rating: (243)	Hi, Last week I made calibration by using this method and AO module. No problems so far. I hope AO module is calibrated and it is ok to use it for AI calibration. I just set AQW to 32000 and turned screw to get 32000 at AIW. Easy.
	Best regards, Darius
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1/13/2016 10:15 AM	Rate (0)
Min_Moderator Posts: 4758 Rating: (122)	New question published by universal automation is split to a separate thread with the subject Configuration dip switch for connecting different analogue signal. Best regards Min_Moderator
Min_Moderator Posts: 4758 Rating: (122)
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