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Siemens SIMATIC SIWAREX U2 Weighing Module 7MH4950-2AA01
Manufacturer: Siemens
Condition: Brand New
Lead Time: In Stock
Origin: Germany
Warranty: 12 Months
Email: [email protected]
whatsApp: +86-18150117685
- Overview
- Product Overview
- Key Functions
- Official Specifications
- Frequently Asked Questions
- Compatibility & Ordering Notes
- Hot Selling Models
- Recommended Products
Overview
SIEMENS • SIWAREX U
7MH4950-2AA01 SIMATIC SIWAREX U2 Weighing Module
The SIWAREX U2 is a two-channel weighing electronics module for integrating two platform or hopper scales with analog strain-gauge load cells into SIMATIC S7-300 or ET 200M automation systems.
At a Glance
| Brand | Siemens |
|---|---|
| Model | 7MH4950-2AA01 |
| Product Type | Two-channel weighing electronics module |
| Core Function | Measures and processes signals from two analog load-cell scales |
| Application or Compatible Series | SIMATIC S7-300 and ET 200M weighing applications |
Exact Identification
Match 7MH4950-2AA01 character by character and confirm the complete SIMATIC SIWAREX U2 Weighing Module designation.
Interface Arrangement
Confirm the installed supply, ports, field connections and required accessories before wiring the replacement.
Configuration Check
Preserve the approved engineering project, network parameters and application data used by the installed system.
Product Overview
The SIWAREX U2 is a two-channel weighing electronics module for integrating two platform or hopper scales with analog strain-gauge load cells into SIMATIC S7-300 or ET 200M automation systems.
Two independent weighing channels acquire analog full-bridge load-cell signals and make the measured values available to the SIMATIC controller. The module combines weight processing, limit-value monitoring and diagnostic messages with the SIMATIC automation environment. A dedicated RS 232 port connects a PC running SIWATOOL U for scale adjustment, parameter transfer and diagnostic analysis.
Key Functions
Dual-Scale Signal Processing
Two independent weighing channels acquire analog full-bridge load-cell signals and make the measured values available to the SIMATIC controller.
Integrated SIMATIC Diagnostics
The module combines weight processing, limit-value monitoring and diagnostic messages with the SIMATIC automation environment.
Local Commissioning Interface
A dedicated RS 232 port connects a PC running SIWATOOL U for scale adjustment, parameter transfer and diagnostic analysis.
Official Specifications
| Rated Power-Supply Voltage | 24 V DC through the front connector |
|---|---|
| Static Supply-Voltage Limits | 20.4 to 28.8 V DC |
| Dynamic Supply-Voltage Limits | 18.5 to 30.2 V DC |
| Maximum Current Consumption at Rated Voltage | 240 mA for the two-channel version |
| Typical Module Power Loss | 5.8 W for the two-channel version |
| Backplane-Bus Current at 5 V | Less than 100 mA |
| Measurement Error Limit | No more than 0.05% of measurement-range end value at 20 °C ±10 K |
| Measured-Value Update Rate | 50 Hz |
| Internal Measurement Resolution | 65,535 parts |
| Weight-Value Display Range | -32,768 to 32,767 |
| Selectable Measurement Ranges | 0 to 1 mV/V, 0 to 2 mV/V, or 0 to 4 mV/V |
| Standard Maximum Load-Cell Distance | 500 m |
| Load-Cell Excitation | Regulated 6 V DC with a maximum current of 150 mA |
| Permissible Load-Cell Resistance Without Ex Interface | Greater than 40 ohms and less than 4,010 ohms per channel |
| Maximum Signal and Sensor Input Voltage | 15 V |
| Common-Mode Rejection at 50 Hz | Greater than 80 dB |
| Low-Pass Filter Cutoff Range | 0.05 to 5 Hz |
| RS 232C Communication | 9,600 baud, 8 data bits, even parity, 1 stop bit, maximum 15 m |
| TTY Communication | Passive unidirectional transmitter, 9,600 baud, 8 data bits, even parity, 1 stop bit, maximum 125 m at 20 mA |
| Module Dimensions | 40 x 125 x 130 mm |
Frequently Asked Questions
Can 7MH4950-2AA01 connect two separate weighing scales?
Its two-channel design supports two independent platform or hopper scales with analog full-bridge load cells.
Which load-cell signal ranges can I configure on 7MH4950-2AA01?
Each weighing channel can use a range of 0 to 1, 0 to 2, or 0 to 4 millivolts per volt.
Can 7MH4950-2AA01 operate in an ET 200M remote I/O station?
The module supports peripheral operation in ET 200M as well as central or expansion-rack use in SIMATIC S7-300.
How do I commission and diagnose 7MH4950-2AA01 from a PC?
SIWATOOL U connects through the RS 232 port for adjustment, parameter transfer and diagnostic analysis.
Can 7MH4950-2AA01 replace the earlier two-channel SIWAREX U version?
The newer two-channel hardware is software-compatible with the documented predecessor and retains the same ports, frame size and pin assignment.
How far can the load cells be installed from 7MH4950-2AA01?
The standard maximum load-cell cable distance is 500 metres.
Can 7MH4950-2AA01 be used for legal-for-trade weighing?
The module is not designed for legal-for-trade applications under OIML R76.
Compatibility & Ordering Notes
Compatibility Checklist
- Install the module in a SIMATIC S7-300 central or expansion rack, or operate it peripherally through ET 200M.
- Use the required 20-pin front connector and preserve the shield arrangement for the scale and serial connections.
- Back up both channel parameter sets and scale files before exchanging the weighing electronics.
