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
Siemens LOGO! 8 6ED10551HB000BA0 DM8 24R Expansion Module, 4 x Input, 4 x Output : Amazon.com.au: Electronics
Amazon.com: Siemens ST70-1200 – Digital Module SM 1223 8 Input 8 Output Transistor 0.5A : Industrial & Scientific
Amazon.com: 6ED1058-0BA08-0YA1 | SIEMENS Logo! Soft Comfort V8, Single License for 1 Installation E-SW, SW and DOCUMENTATION ON DVD : Industrial & Scientific