Siemens SIMATIC S7-1200 SB 1231 Analog Input Signal Board – 6ES7 231-4HA30-0XB0 | 2 AI Voltage/Current Expansion

The Siemens SIMATIC S7-1200 SB 1231 Analog Input Signal Board (6ES7 231-4HA30-0XB0) is a compact and efficient expansion module designed to add 2 analog input channels to your S7-1200 PLC without occupying additional DIN rail space. This signal board mounts directly onto the front of the S7-1200 CPU, making it an ideal solution for applications where panel space is limited.

The SB 1231 supports both voltage and current input signals such as 0–10V, ±10V, and 4–20mA, allowing easy connection of field devices like pressure sensors, temperature transmitters, flow meters, and level sensors. With precise analog signal processing and easy configuration via TIA Portal, this module is widely used in industrial automation, process control, OEM machines, and control panels.

Its compact design, high accuracy, and seamless PLC integration make it a preferred choice for engineers looking to expand analog input capability without adding bulk to the control system.