Siemens 6ES7223-1BL32-0XB0 SIMATIC S7-1200 SM 1223 16DI/16DO 24V DC PLC I/O Module

The Siemens 6ES7223-1BL32-0XB0 is a SIMATIC S7-1200 digital I/O module, SM 1223, combining 16 sink/source 24 V DC inputs with 16 transistor outputs rated 0.5 A each. It mounts alongside an S7-1200 CPU, draws 185 mA from the 5 V backplane bus, and the IEC 61131 type 1 inputs run parameterizable delays from 0.2 to 12.8 ms.

Technical Specifications

Certifications & Standards

• CE mark
• CSA approval
• UL approval
• cULus
• FM approval
• RCM
• KC approval
• Marine approval

Selection Notes

The transistor outputs on this SM 1223 have no built-in short-circuit protection, so each output circuit needs external fusing or protection sized to the 0.5 A rated current - unlike a relay-output SM 1223 variant, which trades that protection gap for lower switching speed and no polarity restriction. Sink/source input wiring means the same module accepts PNP or NPN field sensors without ordering a different I/O type. At 4.5 W typical power loss and 185 mA drawn from the CPU's 5 V backplane bus, check the CPU's remaining backplane budget before stacking multiple SM 1223 modules on one rack.

Applications

Expands a SIMATIC S7-1200 CPU with 16 additional 24 V DC digital inputs and 16 transistor outputs for machine I/O - pushbuttons, limit switches, valve coils, indicator lamps - where the CPU's onboard I/O count is insufficient.