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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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6ES7231 5PD32 0XB0 PLC SIMATIC S7 1200 SM 1231 RTD Analog Input AI Signal Module Automata controller Communication|Motor Controller| - AliExpress
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1 x Siemens 6AG1231-4HD32-4XB0 SIMATIC S7-1200, Analog, SM1231, 8 Inputs, 13 ADC 4047618046262 | eBay
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