The Siemens 6ES7321-1BH02-0AA0 serves as a high-density digital input module for SIMATIC S7-300 automation systems. This unit acquires 24 V DC signals from field devices such as sensors, pushbuttons, and limit switches. Engineers select this module when they need reliable isolation between field wiring and the control backplane. Consequently, it protects sensitive controller electronics while maintaining signal integrity in industrial environments.
Technical Specifications for the Siemens 6ES7321-1BH02-0AA0
This digital input module features galvanic isolation that prevents ground loops and voltage transients from reaching the backplane. It incorporates input characteristics that comply with IEC 61131, Type 1 standards for global compatibility. The module’s compact design occupies minimal space while supporting up to 16 individual field connections.
| Specification | Details |
|---|---|
| Model Number | Siemens 6ES7321-1BH02-0AA0 |
| Product Type | Digital Input Module SM 321 |
| Dimensions (H x W x D) | 125 mm x 40 mm x 120 mm |
| Weight | 0.2 kg (0.44 lbs) |
| Digital Inputs | 16, isolated |
| Input Type | Sink/source (IEC 61131 Type 1) |
| Input Voltage Type | DC |
| Rated Load Voltage L+ | 24 V DC |
| Permissible Range | 20.4–28.8 V DC |
| Signal “0” Voltage | -30 to +5 V DC |
| Signal “1” Voltage | 13–30 V DC |
| Signal “1” Current | 7 mA typical |
| Input Delay | 1.2 ms typical (hardware) |
| Backplane Current | 10 mA at 5 V DC, max |
| Power Loss | 3.5 W typical |
| Isolation | 500 V AC (field to backplane) |
| Simultaneous Inputs | 16 horizontal, 16 vertical (40°C max) |
| Connection | 20-pin front connector |
| Terminal Type | Screw or spring-cage (optional) |
| Wire Gauge | 24–14 AWG |
| Status Indicators | Green LED per channel |
| Mounting | S7-300 rail mounting |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +70°C |
| Humidity Range | 5–95% non-condensing |
| Certifications | CE, UL, CSA, FM, ATEX |
Advanced Input Features and Performance
The Siemens 6ES7321-1BH02-0AA0 employs a robust input stage that withstands industrial electrical noise. Its 7 mA nominal input current provides reliable sensing even with long cable runs. Additionally, the module supports both sinking and sourcing field devices without hardware modifications. You simply connect field wiring according to standard practices. The per-channel LED indicators show input status clearly during troubleshooting. Therefore, operators can verify field device operation without a separate multimeter. The module operates all 16 inputs simultaneously at 40°C in both horizontal and vertical orientations. This flexibility allows dense packing in space-constrained control cabinets. The 1.2 ms input delay filters contact bounce effectively while maintaining fast system response.
System Integration and Manufacturer Context
Siemens developed the 6ES7321-1BH02-0AA0 as part of their comprehensive SIMATIC S7-300 product family. This digital input module integrates seamlessly with S7-300 CPUs and other signal modules. It works exceptionally well in manufacturing, material handling, and building automation applications. The 20-pin front connector accepts field wiring from proximity sensors, limit switches, and control stations. You can combine multiple 6ES7321 modules in a single rack for high channel counts. For detailed configuration guidelines, consult the Siemens manual under the 6ES7321-1BH02-0AA0 product documentation. This module exemplifies Siemens’ commitment to reliable digital I/O technology for industrial automation.
Details
| Weight | 1.2 kg |
|---|---|
| Dimensions | 50 × 290 × 217 mm |
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