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The Siemens 6ES7223-1PL32-0XB0 SM 1223 functions as a digital I/O expansion module for SIMATIC S7-1200 controllers. This signal module adds balanced input and output capacity to the base CPU. The unit provides 16 digital inputs and 16 transistor outputs in a compact housing.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Digital I/O signal module (SM) |
| Model | SM 1223 (16DI / 16DO) |
| Compatibility | SIMATIC S7-1200 |
| Digital Inputs | 16 x 24V DC (sink/source) |
| Digital Outputs | 16 x 24V DC / 0.5A (transistor) |
| Total I/O Points | 32 channels |
| Input Current | 4 mA per channel (typical) |
| Input Delay | 0.1 – 20 ms (programmable) |
| Output Type | Sourcing (PNP) |
| Output Protection | Short-circuit, overcurrent (1A limit) |
| Switching Frequency | 100 Hz (resistive load) |
| Isolation | 500V DC (optocoupler per group) |
| Dimensions (W x H x D) | 100 x 75 x 35 mm |
| Weight | 0.22 kg |
| Internal Components | 16 x optocouplers, 8 x driver ICs, 1 x shift register |
| Bus Connector | S7-1200 backplane (push-in) |
| Field Terminals | Spring-cage connectors (removable) |
| LED Indicators | 16 x green (inputs), 16 x green (outputs) |
| Power Supply | 24V DC (from backplane) |
| Power Consumption | 24V / 30 mA (no load), 24V / 8.3A (full load) |
| Operating Temperature | -20°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Protection Class | IP20 |
| Mounting | DIN rail (35mm) |
| Approvals | CE, UL, CSA, ATEX (Zone 2), IECEx |
Balanced Digital I/O Expansion
The Siemens 6ES7223-1PL32-0XB0 delivers 16 digital inputs and 16 digital outputs in a single module. This balanced configuration suits applications requiring equal sensing and actuation capacity. The inputs capture signals from pushbuttons, sensors, and limit switches. The outputs drive actuators, relays, and indicator lamps directly.
Programmable Input Delay for Noise Rejection
Users can program input delays from 0.1 ms to 20 ms for each channel individually. This adjustable filtering rejects contact bounce and electrical noise from industrial environments. The module samples inputs at the configured interval for reliable signal acquisition. Short delays suit fast-response applications while longer delays provide noise immunity.
Robust Transistor Outputs with Protection
The 16 transistor outputs deliver 0.5A continuous each for driving various loads. Short-circuit protection limits output current to 1A during fault conditions. The outputs switch resistive loads at frequencies up to 100 Hz. Users can implement PWM control or rapid cycling without performance degradation.
Group Isolation for Noise Immunity
Optocouplers provide 500V DC isolation between the field I/O and the backplane. This isolation prevents ground loops and protects against voltage transients. The module groups isolation by bank for efficient protection coverage. This design ensures reliable operation in electrically noisy industrial environments.
Compact Form Factor for Space Efficiency
The signal module measures 100 x 75 x 35 mm and weighs only 0.22 kg. This compact footprint allows dense module mounting on the DIN rail. The design saves valuable space in control cabinets and enclosures. Users can add multiple modules for expanded system capability.
Visual Status Indication for Diagnostics
Green LEDs display the real-time status of every input and output channel. Operators can verify signal presence and output activation at a glance. These visual indicators simplify commissioning and speed up troubleshooting. The module’s LED array provides immediate feedback for maintenance personnel.