| 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 |
16-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.
