Siemens SIMATIC S7-1200 SM 1223 Digital Input/Output Module, 8 DI/8 DO, 24 V DC, Transistor 6ES7223-1BH32-0XB0

Automation engineers integrating compact control systems in manufacturing cells or packaging lines will find the SM 1223 module an essential expansion for the SIMATIC S7-1200 PLC. It adds eight digital inputs and eight digital outputs in a single housing, simplifying wiring and saving panel space.

Key specifications

• 8 digital inputs, 24 V DC, sinking/sourcing, with configurable input delays from 0.2 ms to 12.8 ms
• 8 digital outputs, transistor (PNP), 24 V DC, 0.5 A per channel, total 4 A
• Electronic short-circuit protection with automatic restart on outputs
• High-speed outputs up to 100 kHz for pulse train or PWM applications
• Optical isolation between channels and backplane bus for reliable operation
• DIN rail mounting, operating temperature -20 °C to +60 °C
• Diagnostics function for monitoring module status
• Power consumption: max. 1.5 W from backplane bus

Why choose it

Combining inputs and outputs in one module reduces component count and wiring effort. The transistor outputs support fast switching for precise motion control or high-speed counting tasks, while the built-in diagnostics help minimize downtime.

Ideal use cases

• Machine automation with sensors and actuators
• Conveyor systems requiring fast output response
• Small to medium control panels where space is limited
• Applications needing both digital I/O and pulse output capability

Good to know

The module is part of the SIMATIC S7-1200 family and is compatible with standard 35 mm DIN rails. It operates in horizontal mounting orientation within the specified temperature range. For detailed wiring and configuration, refer to the Siemens manual.