SIMATIC S7‑200 expansion module (EM 231), 6ES7231-0HC22-0XA0

SIMATIC S7-200, Analog input EM 231, only for S7-22X CPU, 4 AI, 0-10V DC, 12 bit converter

6ES7231-0HC22-0XA0

? Overview

• This is a SIMATIC S7‑200 expansion module (EM 231), providing 4 analog inputs (12-bit) for 0–10 V DC voltage signals. It’s compatible only with S7‑22x CPUs in the S7‑200 series

⚡ Electrical Specifications

• Analog channels: 4, differential inputs; digitization: 12-bit resolution
• Input voltage ranges: 0–10 V, 0–5 V, ±2.5 V, ±5 V; input resistance ~10 MΩ
• Maximum overvoltage: up to 30 V (destruction limit)
• Conversion time: 250 µs per channel
• Power consumption:
• Load side (L+): max 60 mA
• Backplane (5 V): max 20 mA
• Typical power dissipation: ~2 W

?️ Features & Diagnostics

• LED: front-panel fault indicator ("EXTF")
• Potential separation: no galvanic isolation between channels and CPU backplane

? Physical Specs

• Dimensions: 71.2 × 80 × 62 mm; Weight: ~0.16 kg

? Lifecycle & Availability

• Classified as a Spare Part, officially cancelled since October 1, 2017 (PLM PM410); no active production
• Still available through surplus, refurbished, or third-party vendors (e.g., Amazon, eBay)

? Applications

• Ideal for adding basic analog voltage inputs to S7‑200 systems—useful for sensors, control signals, or external voltage inputs.
• Best suited to compact or legacy automation setups that don’t require isolation or high-speed sampling.

? Summary Table