6ES7 321-1BL00-0AA0 Siemens SIMATIC S7-300 Digital input SM 321

Product Overview

The 6ES7 321-1BL00-0AA0 is a genuine Siemens SM 321 digital input module for the SIMATIC S7-300 PLC platform. Offering 32 isolated 24 VDC channels in a single 40-pin front connector design, it delivers high-density, reliable signal acquisition for sensors, pushbuttons, limit switches and proximity devices. With front LEDs, channel-group diagnostics and hot-swap capability, this module is the standard choice for discrete input expansion in manufacturing, packaging and process control systems.

Key Specifications

• Part number (MLFB): 6ES7 321-1BL00-0AA0
• Product line: SIMATIC S7-300 SM 321
• Input channels: 32 digital inputs
• Rated input voltage: 24 VDC (20.4–28.8 VDC)
• Electrical isolation: Channel-group to backplane bus, 500 V AC
• Signal delay: Typ. 3 ms (configurable 0.1 / 0.5 / 3 / 15 / 20 ms)
• Current consumption: 15 mA from backplane 5 V bus
• Power loss: 6.5 W typical
• Connector: 1× 40-pin front screw terminal block (included)
• Dimensions (W×H×D): 15.00 x 12.80 x 5.00 cm
• Weight: 300 g
• Certifications: CE, UL, cULus, ATEX Zone 2, RCM, RoHS

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