Siemens simatic S7-1200 AI8 RTD SM1231 6ES7 231-5PF32-0XB0 analog input SM 1231 | eBay
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