6es7231-4hf32-0xb0Overview The Siemens 6ES7231 4HF32 0XB0 is a high performance analog input module designed for use with the SIMATIC S7 1200 PLC series. This module features 8 analog inputs and supports multiple input types, including 10 V, 5 V, 2. 5 V, and 0 20 mA 4 20 mA. It offers 12 bit resolution with sign or 13 bit ADC, ensuring precise data acquisition for industrial automation applications. Key Features 8 Analog Inputs: Supports input signals of 10 V, 5 V, 2.