6ES7321-1EL00-0AA0 New Original Siemens S7-300 Plc Programming Controller module

2. Key Selling Points

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.