Overview
The Siemens 6ES7-223-1BL22-0XA8 EM 223 CN is a compact digital I/O expansion module designed for S7-200CN compact automation systems. This module extends digital input and output capabilities on Siemens small PLCs, enabling rapid integration into existing control architectures without extensive redesign. The 24VDC configuration suits standard industrial voltage rails, making it ideal for retrofit applications and capacity expansions in manufacturing, packaging, and process facilities.
Key Features
- 16 digital inputs (DI) and 16 digital outputs (DO) on single module
- 24VDC input voltage range (15–30V nominal and operational span)
- 0.75A per output; suitable for solenoid coils, motor contactors, and indicator lamps
- DC/DC isolated power architecture for noise immunity
- Compact 46 × 80 × 62 mm footprint with 280 g weight
- Made in China; E-stand certified for industrial environments
Technical Specifications
| Part Number | 6ES7-223-1BL22-0XA8 |
| Module Type | Digital I/O Expansion (EM 223 CN) |
| Digital Inputs | 16 points @ 24VDC (15–30V range) |
| Digital Outputs | 16 points @ 24VDC, 0.75A per output |
| Output Voltage | 21–28 VDC |
| Power Isolation | DC/DC isolated |
| Dimensions (W × H × D) | 46 mm × 80 mm × 62 mm |
| Weight | 280 g |
| Compatible CPU Series | S7-200CN (S7-22X) |
| Certification | E-stand 05; Made in China |
| Condition | New in Box |
Typical Applications
This module is widely deployed in:
- Machine automation: Add digital I/O capacity to packaging machines, conveyors, and assembly systems
- Process control: Extend sensor inputs and pump/valve outputs for batch processes and pneumatic logic
- Building automation: Retrofit HVAC and facility control systems with additional 24VDC switching capacity
- Test and measurement: Multiplex external DI/DO circuits in laboratory automation and equipment diagnostics
Compatibility & Replacements
The EM 223 CN is a standard expansion module for Siemens S7-200CN compact PLCs only. It plugs directly into the expansion slot of compatible S7-22X CPUs and requires no reconfiguration of the host processor. Direct replacement modules in the S7-200 classic range (non-CN) include the 6ES7 223-1BF20-0XA0 (24VDC In / Relay Out) and 6ES7 223-1HF20-0XA0 (24VDC In/Out), though pinout and mounting may differ. Always verify slot compatibility before substitution. For non-Siemens systems, equivalent Mitsubishi FX2N-16EX or Omron CJ1W-OD232 modules may offer comparable I/O density but require custom mounting and wiring.
