7MH4138-6AA00-0BA0 | SIWAREX WP321 ST for SIMATIC ET 200SP
Manufacturer: Siemens
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Part Number: 7MH4138-6AA00-0BA0
Condition：New with Original Package
Product Type: WP321 ST for SIMATIC ET 200SP
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Siemens SIWAREX WP321 ST | Precision Weighing Module for ET 200SP
The Siemens 7MH4138-6AA00-0BA0 is a sophisticated single-channel weighing electronic module designed specifically for the SIMATIC ET 200SP distributed I/O system. This compact module transforms your standard automation rack into a high-precision scale controller by connecting directly to analog load cells. Engineers frequently choose the SIWAREX WP321 ST because it eliminates the need for external weighing terminals or complex signal converters.
Integrating weighing technology directly into the PLC environment significantly reduces communication latency and simplifies your system architecture. The module supports strain gauge full bridges and provides exceptional measurement resolution for demanding industrial tasks. Moreover, its seamless fit into the ET 200SP BaseUnit (Type A0) ensures that your installation remains space-efficient and electronically stable. Therefore, this module represents the ideal balance between industrial-grade ruggedness and laboratory-level measurement accuracy.
Technical Specifications
| Parameter | Technical Data |
| Model Number | 7MH4138-6AA00-0BA0 |
| Product Series | SIWAREX WP321 ST |
| System Compatibility | SIMATIC ET 200SP (BaseUnit Type A0) |
| Number of Channels | 1 (Single-channel weighing) |
| Load Cell Type | Analog strain gauge full bridges (1-4 mV/V) |
| Interfaces | 1 x RS485, 1 x Load Cell Input |
| Resolution | Up to +/- 2 million parts |
| Operating Temperature | -25 °C to +60 °C (-13 °F to 140 °F) |
| Dimensions | 15 x 73 x 58 mm |
| Net Weight | 0.2 Kg |
| Country of Origin | Germany |
Frequently Asked Questions (FAQ)
Which BaseUnit is required for the SIWAREX WP321 ST?
This module is compatible with the standard ET 200SP BaseUnit Type A0, which provides the necessary terminals for load cell connection.
Can I calibrate the scale without a physical weight?
Yes, you can perform a "theoretical calibration" using the SIWATOOL software by entering the technical data of your load cells.
Does this module support legal-for-trade applications?
The WP321 ST is designed for high-precision industrial weighing, but you should verify local regulations for specific legal-for-trade certification requirements.
How many load cells can I connect to a single module?
You can typically connect up to four 350-ohm load cells in parallel to the single-channel input of the WP321 ST.