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SIEMENS 6ES7321-1BL00-0AA0 Digital Input Module – Complete Overview

Product Description

The SIEMENS 6ES7321-1BL00-0AA0 is a 32-channel digital input (DI) module from the SIMATIC S7-300 series, designed for industrial automation systems. It provides 24V DC isolated inputs with fast signal processing (1.2–4.8ms response time), making it ideal for connecting switches, proximity sensors (BERO), and other digital field devices in PLC control systems .

Key Features & Advantages

High-Density Input Configuration
- 32 digital inputs (24V DC, IEC 61131 Type 1 compliant) for efficient space utilization .
- Supports 2-wire sensors with ≤1.5 mA leakage current tolerance .
Fast & Reliable Signal Processing
- Input delay: 1.2 ms (min) to 4.8 ms (max) for stable signal acquisition .
- LED status indicators (green) for real-time monitoring of each input .
Industrial-Grade Durability
- Potentially isolated (500V DC) between channels and backplane bus (grouped in 16s) .
- Wide voltage range (20.4–28.8V DC) for stable operation in fluctuating power conditions .
Easy Integration
- 40-pin front connector for secure wiring .
- Compact dimensions (40 × 125 × 120 mm) for DIN rail mounting in tight spaces .

Technical Specifications

Parameter	Specification
Input Voltage	24V DC (13–30V for "1", -30 to +5V for "0")
Input Current	7 mA (typical for "1")
Power Consumption	6.5 W (typical)
Cable Length	1000 m (shielded), 600 m (unshielded)
Isolation	500V DC (channel-to-backplane)
Operating Temp.	0°C to +60°C
Weight	260 g

Applications

Factory Automation: Conveyor control, packaging machines .
Process Control: Valve monitoring, pump status detection .
Building Management: Lighting systems, HVAC controls .

Installation & Safety Notes

Wiring: Use shielded cables for long-distance signal transmission to reduce EMI .
Environment: Avoid condensation (IP20 protection) .
Testing: Verify sensor connections and LED status during commissioning .