Product Description
Product Overview
| Parameter | Details |
|---|---|
| Part Number | 6ES7321-1BL00-0AA0 |
| Product Name | SIMATIC S7-300 Digital Input Module SM 321 – 32 DI |
| Application | High-density digital signal acquisition for industrial automation, machine control, and process systems (e.g., switches, sensors, limit switches, proximity detectors) |
| Compatibility | SIMATIC S7-300 PLC (CPU 312–319); ET 200M; mounts in S7-300 rack (any I/O slot) |
| Function | Provides 32 optically isolated 24 V DC digital inputs (sink/source) with diagnostics, LED per channel, and high noise immunity |
Functional Specifications
| Parameter | Details |
|---|---|
| Number of Inputs | 32 (2 groups of 16, optically isolated) |
| Input Type | 24 V DC, sink/source (IEC 61131-2 Type 1) |
| Rated Voltage | 24 V DC (20.4 – 28.8 V) |
| Input Current | 7 mA typical (@ 24 V) |
| Input Delay | 1.2 – 4.8 ms (configurable) |
| Logic Levels | 0: ≤ 5 V 1: ≥ 15 V |
| Cable Length | 1000 m (shielded), 600 m (unshielded) |
| Isolation | 500 V AC (field to logic); group isolation (between groups) |
| Common Mode Voltage | ±30 V |
| Diagnostics | LED per input (green); group fault (SF LED); status via CPU |
| Power Loss | 4.5 W typical |
| Front Connector | 40-pole screw-type (0.08 – 2.5 mm²) |
| Operating Temperature | 0°C to +60°C (horizontal); −25°C to +60°C (vertical, derating) |
| Storage Temperature | −40°C to +70°C |
| Dimensions (W×H×D) | 40 mm × 125 mm × 120 mm |
| Weight | 0.25 kg (0.55 lbs) |
| Mounting | SNAP-ON on S7-300 DIN rail |
| LED Indicators | 32× Channel status (green), 1× SF (red) |
| Certifications | CE, UL, cULus, CSA, FM Class I Div 2, ATEX Zone 2 |
| Standards Compliance | IEC 61131-2, EN 61000-6-2/4 (EMC), UL 508, CSA C22.2 |
Ordering Information
| Parameter | Details |
|---|---|
| Part Number Configuration | 6ES7321-1BL00-0AA0 (SM 321, 32 DI, 24 V DC, sink/source) |
| Replaces / Supersedes | 6ES7321-1BL00-0AA0 is the current revision – no direct predecessor |
| Available Options | • 6ES7321-1BH02-0AA0: 16 DI version • 6ES7321-1BH50-0AA0: 16 DI, NAMUR (Ex i) • 6ES7321-1FF01-0AA0: 8 DI, 120/230 V AC |
| Accessories | • 6ES7392-1AM00-0AA0: 40-pole front connector (spare) • 6ES7590-1AB60-0AA0: Labeling strips |
| Programming | Configurable via STEP 7 V5.5+ or TIA Portal V13+ |