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This SIWAREX weighing module integrates high-precision load cell measurements into SIMATIC systems. It converts analog weight signals into digital values for PLC processing. Therefore, this component suits batching, filling, and level monitoring applications.
Physical Dimensions and Weight Specifications
The Siemens 7MH3305-1AA features a compact housing for DIN rail mounting. Its width measures 30 mm for standard industrial enclosures. The total depth reaches 115 mm including the terminal block. Consequently, technicians can install this module in tight cabinet spaces.
| Parameter | Specification |
|---|---|
| Product Model | Siemens 7MH3305-1AA |
| Width | 30 mm |
| Height | 110 mm |
| Depth | 115 mm |
| Weight | 0.18 kg |
Interface Types and Connection Layout
The Siemens 7MH3305-1AA provides screw-clamp terminals for load cell wiring. A 10-pin backplane connector supplies power and data from the CPU. The front panel carries LED indicators for weighing status and errors. Hence, operators can verify measurement integrity at a quick glance.
Component Count and Signal Processing
This weighing module contains one main board with a 24-bit ADC converter. The board holds 8 KB of calibration data memory for linearization. You will also find a precision voltage reference for accurate measurements. An onboard microcontroller handles filtering and scale adjustment.
| Technical Feature | Description |
|---|---|
| Load Cell Input | 2 or 4 mV/V, 6-wire connection |
| ADC Resolution | 24 bits (16.7 million counts) |
| Sampling Rate | 50 Hz or 100 Hz selectable |
| Internal Resolution | 1,000,000 divisions |
| Accuracy | ±0.05% of full scale |
Energy Storage and Power Consumption
The Siemens 7MH3305-1AA draws 120 mA from the 24V DC supply. A small capacitor bank filters noise on the load cell excitation lines. This storage ensures stable measurements in electrically noisy environments. The module requires no battery for normal operation.
Weighing Performance and Diagnostic Features
The module achieves 1,000,000 internal divisions for high-resolution weighing. It includes automatic zero tracking and drift compensation. Users can read weight values directly in grams, kilograms, or tons. This flexibility supports various industrial weighing applications.