Siemens 6ES7223-1BH32-0XB0 SIMATIC S7-1200 SM 1223 8DI/8DO Digital I/O PLC I/O Module

The Siemens 6ES7223-1BH32-0XB0 is a SIMATIC S7-1200 digital I/O module, SM 1223, with 8 sink/source 24V DC inputs and 8 transistor outputs rated 0.5A, expanding an S7-1200 CPU's I/O count with IP20-rated hardware carrying CE, UL, CSA, cULus, FM, RCM, KC, and Marine approvals.

Technical Specifications

Certifications & Standards

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

Selection Notes

The 8 transistor outputs have no internal short-circuit protection, so each output circuit needs its own external fuse or protection device sized to the 0.5A rating - a detail that catches installers moving from a protected relay-output SM to this transistor variant. Inputs are grouped in twos for wiring and in fours for the input-delay parameter (0.2 to 12.8 ms), so a noisy limit switch can be filtered without slowing down a fast encoder input on the same module. Marine approval alongside the standard CE/UL/cULus set is the reason to pick this SM 1223 over a lower-cost equivalent when the panel is destined for a vessel or offshore application.

Applications

I/O expansion for S7-1200-based machine control - discrete sensor/switch inputs and valve, indicator, or relay-coil transistor outputs - including marine and offshore panels where Marine approval is a project requirement.