6ES7223-1BH32-0XB0 8 DI / 8 DO Digital I/O Module

6ES7223-1BH32-0XB0 Overview

When your S7-1200 system needs reliable digital I/O expansion, the 6ES7223-1BH32-0XB0 from Siemens delivers. This SM 1223 module combines 8 digital inputs and 8 digital outputs in a compact package. It operates on a 24 V DC supply and supports both sink and source wiring for the inputs. The transistor outputs switch up to 0.5 A each, making it suitable for controlling valves, contactors, and indicator lamps.

Key Features and Technical Specifications

• 8 digital inputs, 24 V DC, sink/source (IEC 61131 type 1)
• 8 digital outputs, transistor, 0.5 A per channel
• Input voltage range: 20.4 V to 28.8 V DC
• Output voltage: 24 V DC rated, signal "1" min. 20 V DC
• Input delay parameterizable: 0.2 ms to 12.8 ms
• Output delay: max. 50 µs (0→1), max. 200 µs (1→0)
• Diagnostic alarm and status LEDs for inputs and outputs
• IP20 protection, CE, UL, CSA, FM, RCM, KC, Marine approvals

The module draws up to 145 mA from the backplane bus at 5 V DC. Power loss is typically 2.5 W. Inputs are grouped in pairs, while outputs are individually isolated. The outputs have no short-circuit protection, so external fusing is required. Inductive loads are clamped to L+ (-48 V) to limit shutdown voltage spikes.

Installation and Setup

Mount the 6ES7223-1BH32-0XB0 on a standard DIN rail or directly onto the S7-1200 mounting rail. Connect the front connector (required) for all field wiring. Ensure the supply voltage stays within 20.4 V to 28.8 V DC. For inputs, wire sensors according to sink or source configuration. For outputs, connect loads with appropriate external protection. Shielded cables can run up to 500 m for inputs and outputs; unshielded cables up to 300 m for inputs and 150 m for outputs.

Maintenance and Reliability

Routine inspection of the module and wiring is recommended. Check for loose connections and signs of overheating. The module operates in temperatures from -20 °C to 60 °C horizontally and up to 50 °C vertically. Store it between -40 °C and 70 °C. Keep the enclosure clean and avoid condensation. With proper care, the solid-state outputs provide long service life without mechanical wear.

Compatibility and Integration

The 6ES7223-1BH32-0XB0 is part of the SIMATIC S7-1200 family. It connects to the backplane bus and is configured via TIA Portal. It supports parameterizable input delays and diagnostic alarms, integrating into your automation program.

Troubleshooting and Common Issues

If outputs fail to switch, check the load supply and external fuses. For input issues, verify the signal voltage meets the threshold: signal "1" requires at least 15 V DC at 2.5 mA. Signal "0" is below 5 V DC at 1 mA. Use the status LEDs to quickly identify faulty channels. If the module does not communicate, ensure it is properly seated and the backplane bus connection is secure.

Product Support and Availability

The 6ES7223-1BH32-0XB0 is available from AutoDCSTech. Contact us for current stock and delivery information.