Two-channel weighing electronics for analog load cells in S7-300 and ET 200M systems.
The Siemens 7MH4950-2AA01 is a SIWAREX U2 two-channel weighing module for SIMATIC S7-300 and ET 200M systems. Siemens specifies it for two platform or hopper scales using analog load cells or full-bridge strain gauges. The module provides two load-cell interfaces for 1 to 4 mV/V signals and one RS232 interface. It is intended for installed weighing applications where the PLC or distributed I/O station already uses the matching SIWAREX U architecture. Before replacement, verify the complete suffix, number of weighing channels, load-cell sensitivity, bus integration, project configuration and the installed connector arrangement.
| Item | Status |
|---|---|
| Product Condition | Original new |
| Availability | In stock |
| Official Lifecycle | PM400: Announcement of product phase-out; effective since October 1, 2023 |
| Warranty | With 1 year warranty |
| Shipping | Worldwide shipping options available |
| Technical Field | Officially Confirmed Detail |
|---|---|
| Manufacturer | Siemens |
| Complete Part Number | 7MH4950-2AA01 |
| Product Type | Two-channel weighing module |
| Series / Type Designation | SIWAREX U2 |
| System Integration | SIMATIC S7-300 and ET 200M |
| Weighing Channels | 2 |
| Supported Scale Types | Two platform or hopper scales |
| Load Cell Technology | Analog load cells / strain gauges, full bridges |
| Load Cell Interfaces | 2 x LC interface |
| Load Cell Sensitivity | 1 to 4 mV/V |
| Serial Interface | 1 x RS232 |
| Net Weight | 0.240 kg |
| Packaging Dimensions | 48 x 130 x 150 mm |
| Country of Origin | GERMANY |
| Use Area | Procurement Relevance |
|---|---|
| Platform scales | Provides two weighing channels for compatible analog load-cell assemblies. |
| Hopper weighing | Supports two hopper-scale measurement paths within an S7-300 or ET 200M project. |
| Distributed weighing stations | Fits ET 200M architectures when the installed bus and project configuration are compatible. |
| Maintenance and replacement | Match channel count, load-cell sensitivity, connector set and project data before exchange. |
| Check | What to Verify |
|---|---|
| Complete part number and suffix | Match 7MH4950-2AA01 exactly against the installed module and project bill of materials. |
| Weighing architecture | Confirm that the application requires two SIWAREX U weighing channels. |
| Load-cell signals | Verify full-bridge technology, 1 to 4 mV/V sensitivity, wiring, connector arrangement and calibration data. |
| Interfaces and connectors | Confirm both load-cell connections, RS232 use and the installed connector arrangement. |
| PLC or station fit | Review S7-300 or ET 200M rack integration and available slot requirements. |
| Project parameters | Back up calibration, scale parameters and PLC configuration before replacement. |
| Lifecycle planning | Plan spares using the official PM400 phase-out wording without treating it as Discontinued. |
| Product evidence | Request readable nameplate, connector, packaging and condition photos before shipment. |
It identifies the Siemens SIWAREX U2 two-channel weighing module for S7-300 and ET 200M systems.
Siemens uses the status “PM400: Announcement of product phase-out,” effective since October 1, 2023; this page does not relabel it as Discontinued.
Siemens specifies two channels for two platform or hopper scales with compatible analog load cells.
Verify full-bridge technology, 1 to 4 mV/V sensitivity, wiring, connector arrangement and calibration data.
Check the complete suffix, S7-300 or ET 200M integration, RS232 use, project configuration and stored weighing parameters.
Yes. Buyers can request full product, nameplate, connector, packaging and condition photos for order verification.
Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
Practical verification, inspection, documentation and logistics coordination for project and maintenance orders.
| Service Stage | What Our Team Reviews |
|---|---|
| Model and suffix verification | The full order code, suffix and available label evidence are compared with the buyer’s request. |
| Condition confirmation | Condition information is documented without substituting unverified stock quantities or delivery promises. |
| Technical compatibility review | Interfaces, connectors, power, firmware, mounting and project requirements are reviewed with the information provided. |
| Product and label photo confirmation | Available product, connector, nameplate, accessory and packaging photos can be supplied before shipment. |
| Protective packaging | Components are prepared with suitable protection for handling and international transport. |
| Worldwide shipping | Routing, shipment tracking and destination requirements are coordinated for the confirmed order. |
| Customs documentation | Commercial documents are prepared for the agreed shipment and destination information. |
| Written warranty terms | Warranty coverage is stated in writing as part of the Stockoems commercial terms. |
| Return authorization process | Return requests are reviewed through an authorization process using order and inspection evidence. |
| After-sales response | Our team remains available for delivery, documentation and product-condition questions after shipment. |
Request readable label photos, the complete order code, condition images, connector views, packaging evidence and written commercial terms.
Compare the suffix, hardware version, available documentation, inspection process, traceable communication, warranty wording and return procedure.
Verify electrical interfaces, power architecture, firmware, mounting, configuration files, approved accessories and the installed system context.
Watch for blurred labels, mismatched suffixes, copied specifications, unverifiable photos, unrealistic lead-time promises and missing return conditions.
Share the complete part number, quantity, destination and available product-label photos for verification and shipping coordination.
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Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
