| Product Type | S7-300 Digital Extension |
| Product Model | 6ES7321-1BH50-0AA0 |
| Supply Voltage Type | DC |
| Product Dimensions | 40 MM × 125 MM × 120 MM |
| Power Supply Voltage | Rated value (DC) 24 V Allowable range, lower limit (DC) 20.4 V Allowable range, upper limit (DC) 28.8 V |
| Weight | 200 g |
High-Performance Digital Input Module for S7-300 Series: Model SM 321 DI 32x24VDC, a high-density signal module in the SIMATIC S7-300 PLC system—provides 32 channels of 24 V DC digital inputs in a single module, ideal for automation systems requiring large-scale discrete signal acquisition.
Cost-Effective Solution: Reduces the number of modules and wiring complexity compared to using multiple 16-channel modules—lowering installation, maintenance, and overall system costs. An ideal choice for large-scale automation systems.
Plug-and-Play & Seamless STEP 7 Integration:Supports automatic module recognition and hardware configuration—no additional tools required.Fully compatible with Siemens STEP 7 engineering software for online commissioning, parameterization, and firmware updates—improving engineering efficiency.
Advanced Diagnostic Capabilities:Supports broken wire detection on the common return line (M-wire) for each 8-channel group.LED indicators show RUN, ERROR, and 24 V DC power status.Diagnostic data accessible via STEP 7 software for remote monitoring and rapid troubleshooting.
Wide Input Voltage Range:Operates from 20.4 V to 28.8 V DC, accommodating voltage fluctuations in industrial environments for stable and reliable signal detection.
