Description
The Siemens SIWAREX U1 (7MH4900-1AA01) is a single-channel weighing and batching module fully integrated into the SIMATIC S7-300 / ET 200M automation system. Connected via the backplane bus, it requires no additional wiring for communication and is configured directly in STEP 7 or TIA Portal — making it the most seamless solution for legal-for-trade and process weighing applications within the Siemens ecosystem. The companion models 7MH4980-1AA01 (calibration/test weight kit) and 7MH4980-2AA01 (termination/shield kit) are accessory items for proper installation and calibration.
Key Features
- Full S7 Backplane Integration: Communicates via SIMATIC backplane — no separate fieldbus wiring needed
- Single Weighing Channel: 1× load cell / strain gauge input (1–4 mV/V excitation)
- Legal-for-Trade Capable: OIML R76/ NTEP approved (when used with approved load cells & correctly calibrated)
- Built-in Batching & Totalizing: 4-stage dosing (coarse/fine cut-off), tare, zero, alarm functions
- Resolution: Up to 65000 divisions (internal 24-bit A/D)
- Digital I/O via PLC: Uses S7 digital I/O modules for start, stop, alarm, etc.
- Companion Accessories: 7MH4980-1AA01 (test weight kit), 7MH4980-2AA01 (shield/termination kit)
- Country of Origin: Germany
Technical Specifications
Parameter | Specification |
|---|---|
Model | 7MH4900-1AA01 (SIWAREX U1 single-channel) |
System Compatibility | SIMATIC S7-300 (central rack) & ET 200M (distributed via PROFIBUS DP) |
Weighing Channels | 1 (single load cell / scale) |
Sensor Excitation | 5 V DC, max. 120 mA (supports 1–4 mV/V load cells) |
Input Range | -0.75 mV/V to +3.75 mV/V (adjustable) |
A/D Resolution | 24-bit (up to 65,000 display divisions) |
Update Rate | 50 / 60 Hz (selectable) |
Calibration | Electronic via software (SIWATOOL U), or with test weights (7MH4980-1AA01) |
Digital Inputs/Outputs | Provided via S7-300 DI/DQ modules (not on the SIWAREX module itself) |
Power Supply | From S7-300 backplane (24 V DC derived) |
Operating Temperature | 0 °C to +60 °C |
Certifications | OIML R76, NTEP (NAMAS), CE, cULus, FM (Ex versions available) |
Dimensions (H×W×D) | 125 mm × 40 mm × 117 mm (S7-300 single-width module) |
Weight | Approx. 200 g |
Accessory Items
- 7MH4980-1AA01 — Calibration/test weight kit for SIWAREX U
- 7MH4980-2AA01 — Shield connection / termination kit for weighing cables
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty
- Technical support for configuration and installation
- SIWATOOL U software usage guidance
- Load cell matching & calibration procedure support
- Commissioning and diagnostics support available
Delivery Time
- Standard delivery: 3-5 working days
- Express shipping available upon request
Why Choose Our Store
- Genuine Siemens SIWAREX components
- Global supply network with competitive pricing
- Expertise in weighing & process automation integration
- Comprehensive technical documentation (manuals, GSD files, sample projects)
- Responsive customer service and support
Applications
- Batching / Dosing Plants: Cement, chemical, food ingredient batching
- Filling & Packaging Lines: Checkweighers, net-weight fillers
- Hopper & Silo Weighing: Inventory monitoring by weight
- Legal-for-Trade Scales: When OIML/NTEP certification is required
- Process Control Integration: Seamless weight data into S7-300/S7-1500 via ET 200M
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