The SM 1223 Digital I/O Module (Siemens Part No. 6ES7 223-1BH32-0XB0) is a versatile, compact expansion module for SIMATIC S7-1200 PLCs. It delivers high-density digital interfacing with industrial-grade performance and broad operating temperature tolerance, perfect for expanding automation systems with discrete I/O requirements.
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Key Technical Specifications

I/O Configuration

8 digital inputs (24 V DC), configured sink/source

8 digital outputs (transistor) with 0.5 A drive capacity per channel
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Electrical Characteristics

Input voltage: 24 V DC

Nominal supply current: ~145 mA
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Physical & Environmental

Dimensions: approximately 100 mm × 45 mm × 75 mm (H × W × D)
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Net weight: ~0.432 lb (~196 g)
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Operating temperature: –40 °C to +70 °C
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Product Status & Logistics

Product Lifecycle: Active (PLM PM300)
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Standard lead time: Ships Ex-Works in 1 day
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Compliance & Materials

RoHS compliant since March 15, 2013
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Contains lead, lead monoxide, and specific organic compounds above 0.1% w/w as per REACH Art. 33; considered non-hazardous under intended use
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Engineering Advantages

High I/O Density in a Slim Form Factor
Allows compact installation while significantly expanding digital interfacing capabilities.

Flexible Signal Configuration
Compatible with both sinking and sourcing input configurations for versatile wiring strategies.

Robust Output Performance
Outputs rated at 0.5 A handle common industrial actuators while maintaining a compact footprint.

Wide Temperature Range
Supports demanding environments from –40 °C to +70 °C — ideal for harsh industrial settings.

Seamless PLC Integration
Installs directly onto the S7-1200 backplane for fast, tool-free integration.

Technical Summary Table
Specification Detail
Digital Inputs (DI) 8 × 24 V DC (sink/source)
Digital Outputs (DO) 8 × transistor outputs (0.5 A each)
Supply Current Approximately 145 mA
Dimensions (HxWxD) 100 × 45 × 75 mm
Weight Approximately 0.432 lb (196 g)
Operating Temp. –40 °C to +70 °C
Lifecycle Status Active (PM300)
Compliance RoHS, REACH disclosure
Recommended Applications

Compact Machine Expansion: Ideal for adding discrete I/O points without increasing enclosure size.

Switching Control: Drives small loads like pilot lamps, relays, or signals with minimal footprint.

Field-Hardened Deployments: Performs reliably in extreme industrial environments.

Distributed I/O Strategy: Efficiently scales modular systems using additional signal modules.

Conclusion

The SM 1223 Digital I/O Module (6ES7 223-1BH32-0XB0) provides a powerful blend of compact size, robust industrial performance, and high I/O density. It’s a practical and reliable choice for expanding S7-1200 PLC systems through smart, space-efficient digital interfacing.