1. Main Specifications| Product Type | S7-300 Digital Extension | | Product Model | 6ES7321-1EL00-0AA0 | | Supply voltage type | AC | | Product dimensions | 40 MM × 125 MM × 120 MM | | Input Current | Incoming backplane bus DC 5 V, maximum value 16 mA | | Weight | 300 g |
2. Key Selling Points16-Channel 24V DC Digital Input – High-Density Design:Provides 16 independent digital input points in one module, ideal for systems requiring extensive discrete
signal acquisition while saving rack space. Supports Sinking (NPN) and Sourcing (PNP) Wiring – Highly Flexible:Can be configured as sinking (NPN) or sourcing (PNP) input via common terminal connection, ensuring compatibility with
global sensor standards. Standard 24V DC Interface – Widely Used in Industry:Uses 24V DC, the most common control voltage in industrial automation, for
connecting pushbuttons, emergency stops, limit switches, and
proximity sensors. Galvanic Isolation for Strong Noise Immunity:Features 500V AC isolation between field inputs and backplane bus, protecting the CPU from
electrical noise and surges for stable operation. LED Indicators for Real-Time Channel Status:Each input has a green LED to show active status, enabling fast
visual diagnostics and on-site troubleshooting during commissioning
and maintenance.
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