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Siemens 6ES7 231-4HF32-0XB0 SIMATIC S7-1200, Analog Input, SM 1231, 8 AI, 10V, 5V, -2.5V, OR 0-20MA/4-20 MA, 12 BIT + Sign OR (13 BIT ADC): Amazon.com: Industrial & Scientific
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SIEMENS 6ES7231-4HD32-0XB0 SIMATIC S7-1200, Analog input, SM 1231, 4 AI, +/-10 V 6940408102033 | eBay
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