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 6ES7 211-1BE40-0XB0 SIMATIC S7-1200, CPU 1211C, COMPACT CPU, AC/DC/RELAY, ONBOARD I/O: 6 DI 24V DC; 4 DO RELAY 2A; 2 AI 0-10V DC, POWER SUPPLY: AC 85-264 VAC: Amazon.com: Industrial &
Siemens 6ES7 241-1CH32-0XB0 SIMATIC S7-1200, Communication Module cm 1241, RS422/485, 9 PIN SUB D (Female) Supports Message Based Freeport: Amazon.com: Industrial & Scientific