Siemens SM 323 (6ES7 323-1BH01-0AA0) – SIMATIC S7-300 Mixed Digital I/O Module (8 DI/8 DO)

Siemens SM 323 (6ES7 323-1BH01-0AA0) – SIMATIC S7-300 Mixed Digital I/O Module (8 DI/8 DO)

The Siemens SM 323 (Part No. 6ES7 323-1BH01-0AA0) is a combined Digital Input/Output (DI/DO) module for the SIMATIC S7-300 and ET 200M PLC systems. This module provides 8 digital inputs and 8 digital outputs (transistor, 0.5 A per channel) in a single unit. It is a cost-effective solution designed to simplify wiring, save space in the control cabinet, and provide robust, electronically-protected interfacing with field devices.

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Quick Navigation

• About This Mixed I/O Module
• Applications
• Why ROMA Industrial Company
• Technical Specifications
• Key Features & Benefits

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About This Mixed I/O Module

This product is a combined Digital Input/Output (I/O) Module, commonly referred to as a Mixed Module or SM 323. It consolidates 8 inputs and 8 outputs into one slot, optimizing space usage in the PLC rack. All channels operate on a 24 V DC signal. The digital outputs are transistor-based, featuring fast switching speeds and electronic short-circuit protection for increased reliability. Its design ensures electrical isolation between the field circuits and the PLC’s backplane, protecting the control system from external electrical disturbances.

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Applications

This mixed I/O module is suitable for decentralized and compact control tasks that require both sensing and actuation within the same module, including:

• Small Machine Control and Interlocking
• Localized Control Panels and Jigs
• Integrated Monitoring of Sensors and Control of Solenoids/Contactors
• Simple Automation Tasks in Manufacturing Cells

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Why ROMA Industrial Company

ROMA Industrial is your trusted partner for a full range of industrial supplies across categories like Motion Control & Mechatronics, Electrical & Automation, and Fluid Power & Control. We are committed to providing top-tier products and service to keep your operations running smoothly. We partner with world-class shipping providers like FedEx, DHL, and UPS to ensure fast and reliable delivery worldwide. We accept returns to fulfill your satisfaction and accept variable payments methods including PayPal, credit cards, and more. We are a supplier in Europe, USA, and Saudi Arabia.

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Technical Specifications

• Manufacturer: Siemens
• Part Number: 6ES7 323-1BH01-0AA0
• Model Number: SM 323
• Product Type: Digital Input/Output Module (Mixed)
• Digital Inputs (DI): 8 (24 V DC, Type 1)
• Digital Outputs (DO): 8 (24 V DC, Transistor)
• Output Current: 0.5 A per channel
• Total Current per Group: ≤2 A (for 8 outputs)
• Output Protection: Electronic short-circuit protection (1 A threshold)
• Isolation: Electrically isolated
• Series: SIMATIC S7-300 / ET 200M
• Hazardous Location: Approved for Class I, Div 2 and Zone 2
• Weight: N/A

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Key Features & Benefits

• Space and Cost Efficient: Combines 16 total I/O channels (8 DI / 8 DO) into a single module slot.
• High Reliability: Outputs feature electronic short-circuit protection on each channel.
• Transistor Outputs: Provides fast switching speed for precise control of field actuators.
• Industrial Ready: Approved for Class I, Div 2 hazardous locations and features full electrical isolation.