| Product Type | S7-300 Digital Extension |
| Product Model | 6ES7321-1BH02-0AA0 |
| Working Voltage | 24 V DC |
| Product Dimensions | 40 MM × 125 MM × 130 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 External safety device for power cord (recommended) minimum value 2 A |
| Weight | 340 g |
16-Channel Digital Input (24V DC):Provides 16 channels of 24V DC digital inputs, ideal for acquiring binary signals from pushbuttons, selector switches, limit switches, and relay contacts—suitable for medium-scale automation systems.
Sinking Input (PNP) Configuration:Supports sourcing (PNP) input wiring, where field devices supply the 24V signal to the module—compliant with standard industrial practices.
High Electromagnetic Compatibility (EMC):Features excellent EMC performance and strong resistance to electromagnetic interference, ensuring stable operation in harsh industrial environments.
Configurable Input Filtering:Input filter time can be set via engineering software (e.g., STEP 7), typically 3 ms or 20 ms, effectively suppressing contact bounce and electrical noise for reliable signal detection.
Group Electrical Isolation (8-Point per Group):The 16 inputs are divided into two groups of 8 channels each, with galvanic isolation between groups, preventing cross-interference and enhancing system safety.
