Product Overview

The Siemens 6AG1950-2AA01-4AA0 is a SIPLUS SIWAREX U electronic weighing module designed for industrial weighing and force measurement applications. It is based on the standard Siemens SIWAREX U model 7MH4950-2AA01 and is intended for integration into SIMATIC S7 and ET 200M automation systems.

As part of the Siemens SIPLUS product range, this module combines weighing electronics with additional protection for electronic components. Its printed circuit boards and electronic components receive a conformal coating, helping protect the electronics against environmental influences within the specified operating conditions.

The module supports weighing applications in which measurement results need to be incorporated into an automated control process. Typical tasks include monitoring material quantities, controlling filling operations, measuring loads, and integrating weighing information into production sequences.

Unlike a standalone weighing instrument, the SIWAREX U is designed to work as part of an automation architecture. It allows weighing functions to be incorporated into a SIMATIC-based control system, enabling the PLC to use weight-related information as part of machine logic and process supervision.

The 6AG1950-2AA01-4AA0 is particularly relevant to industrial installations that require a SIPLUS version of the SIWAREX U weighing electronics. Its standard-product technical data is based on the underlying 7MH4950-2AA01 model, while the SIPLUS version adds specific environmental characteristics.

Technical Specifications

Note: The technical data of the standard 7MH4950-2AA01 product applies to this SIPLUS version except where specific environmental conditions are stated. Consult the applicable Siemens documentation for detailed weighing performance, electrical connections, and installation requirements.

Function and Working Principle

The Siemens SIWAREX U weighing module processes signals from compatible weighing sensors and makes weighing information available to the automation system. Its purpose is to connect measurement tasks with machine and process control.

1. Weight Signal Acquisition

Industrial weighing systems commonly use load cells to convert mechanical force into electrical signals. When material is placed on a weighing platform, the load cells produce signals corresponding to the applied load.

The weighing electronics receive and process these signals according to the module’s configuration. Correct sensor wiring, calibration, mechanical installation, and electrical grounding are important for reliable measurements.

2. Electronic Weighing Signal Processing

The SIWAREX U performs the weighing-related electronic functions required by the application. It processes measurement information and supports the integration of weighing operations into the SIMATIC automation environment.

The quality of the resulting measurement depends on the complete weighing system, including the load cells, mechanical structure, wiring, calibration parameters, and operating environment.

3. Integration with SIMATIC Automation

The module is designed for integration into Siemens SIMATIC S7 and ET 200M systems. This allows weighing functions to become part of a wider automation project instead of operating as an isolated measurement process.

A PLC can use weighing information in its control logic. For example, a production system may monitor material quantities, supervise filling operations, or trigger a process step when a configured weight condition is reached.

The actual communication and configuration process must follow the module’s technical documentation and the installed SIMATIC hardware arrangement.

4. Weighing and Force Measurement

The SIWAREX U product family is intended for simple weighing and force measurement tasks. Depending on the mechanical arrangement and sensor configuration, it can support applications involving containers, platforms, material handling, and industrial force measurement.

For accurate results, the weighing structure must be mechanically stable. Load cells must be selected for the expected load range, and the weighing system must be calibrated under appropriate conditions.

5. Environmental Protection

The SIPLUS version includes conformal coating on its printed circuit boards and electronic components. This coating provides additional protection against certain environmental influences compared with an equivalent standard electronic assembly.

The specified ambient temperature range is 0 to +60 °C. Although the product documentation permits high relative humidity and certain condensation or frost conditions, the module must not be commissioned while in a dew-covered state.

Environmental protection should always be assessed against the complete installation conditions. Conformal coating does not mean that the module can be directly exposed to water, chemicals, or unrestricted outdoor conditions.

Role in Industrial Control Systems

The 6AG1950-2AA01-4AA0 serves as a weighing subsystem within a Siemens automation installation. It connects physical measurement tasks with PLC-based process control.

SIMATIC S7 Integration

The module is designed for use with SIMATIC S7 automation systems. Within a suitable configuration, the PLC can use weighing-related information to support production sequences, material monitoring, and process decisions.

This integration helps engineers incorporate measurement functions into the same automation architecture used for machine control, monitoring, and production coordination.

ET 200M System Integration

The SIWAREX U product is also intended for integration with ET 200M systems. This provides an option for applications where weighing functions form part of a distributed automation arrangement.

The correct hardware configuration, module placement, bus connection, and system compatibility must be confirmed before installation.

Process Monitoring

Weight information can be useful for monitoring material quantities and detecting deviations during production. For example, a process may compare measured weight against a configured target or use weighing data as an input to a filling or batching sequence.

The PLC program determines how the measurement data is used. The weighing module provides the measurement-related functionality, while the wider automation system manages process decisions and equipment responses.

Centralized Automation Management

Integrating weighing electronics into a SIMATIC system can simplify the overall control architecture. Engineers can coordinate weighing operations with other automation functions, such as conveyor control, material feeding, filling, and alarm management.

This approach is particularly useful where measurement results must be considered together with machine status and production conditions.

Industrial Applications

The Siemens 6AG1950-2AA01-4AA0 can be considered for industrial applications involving weighing and force measurement within a compatible SIMATIC environment.

1. Industrial Filling Systems

Filling equipment often requires accurate monitoring of material quantities. A weighing system can provide weight information to a PLC, which then coordinates material feeding and filling operations.

For example, a production line may use weight measurements to determine when a container has reached its target quantity. The PLC can then control the relevant valves, pumps, or feeding equipment.

2. Batching and Material Dosing

Batching processes require controlled quantities of raw materials. Weighing information can help an automation system supervise material addition and manage production steps.

In a suitable installation, the SIWAREX U can form part of a weighing arrangement used for material dosing and batch monitoring.

3. Container and Hopper Weighing

Industrial containers, hoppers, and storage vessels may use load cells to monitor the quantity of stored material. The weighing electronics process the sensor signals so that weight-related information can be incorporated into the control system.

This information can support inventory monitoring, material feeding, and process supervision.

4. Conveyor-Based Material Measurement

Weighing systems can be incorporated into material-handling equipment to monitor loads or support material quantity management.

The specific mechanical design determines whether a static or dynamic weighing arrangement is appropriate. Engineers should confirm that the module and sensor configuration support the intended measurement method.

5. Industrial Force Measurement

The SIWAREX U family also supports simple force measurement tasks. With an appropriate sensor and mechanical arrangement, a weighing system can be used to monitor applied forces in industrial equipment.

Examples may include load monitoring, mechanical testing, and process supervision. The sensor range and measurement accuracy must be selected according to the actual application.

6. Automated Production Lines

In automated manufacturing, weighing information can be used alongside temperature, pressure, flow, and position measurements. Integrating these signals into a PLC-based system allows multiple process conditions to be coordinated.

The 6AG1950-2AA01-4AA0 can support the weighing portion of such an installation when the system architecture and technical requirements are compatible.

Installation and System Integration

Correct installation is essential for reliable weighing performance and long-term operation.

1. Verify the Automation Platform

Before installation, confirm that the module is being used in a compatible SIMATIC S7 or ET 200M configuration. Check the system documentation for the required hardware arrangement, bus connection, and module compatibility.

Do not assume that the module can be installed in every SIMATIC rack or distributed I/O station simply because it belongs to the Siemens automation range.

2. Check the Mechanical Installation

The supplied dimensions are 130 × 150 × 49 mm, with a listed weight of 0.282 kg. Verify the physical dimensions and mounting requirements against the module’s installation documentation.

Ensure that the installation location provides suitable mechanical support and access for wiring, inspection, and maintenance.

3. Connect the Weighing Sensors

Load cells and associated weighing sensors must be connected according to the specified terminal arrangement. Pay attention to signal wiring, cable shielding, grounding, and the sensor configuration.

Incorrect wiring or poor grounding can introduce measurement errors. Avoid routing low-level weighing signals alongside high-current power cables where this could cause interference.

4. Configure the Weighing System

After hardware installation, configure the weighing system according to the application requirements and Siemens documentation.

Configuration may involve sensor-related settings, calibration, measurement parameters, and communication with the SIMATIC controller. The correct procedures depend on the underlying SIWAREX U hardware and the installed software environment.

5. Perform Calibration

Calibration is a critical part of weighing-system commissioning. Use appropriate reference weights or an approved calibration procedure to verify that the system reports the expected values.

Check the weighing structure for mechanical interference, unstable mounting, uneven loading, and other conditions that could affect measurement results.

6. Observe Environmental Conditions

The SIPLUS version has a specified ambient temperature range of 0 to +60 °C and conformal coating on its electronic components.

Although the environmental specification permits high humidity and certain condensation or frost conditions, do not commission the module while it is in a dew-covered state. Allow the equipment to reach a suitable condition before energizing it.

7. Test the Complete Automation Sequence

After configuration and calibration, test the weighing function together with the PLC program and connected equipment.

Verify measurement stability, expected weight changes, process thresholds, alarm responses, and communication with the automation system. Record the final configuration and calibration information for future maintenance.

Compatible System Components

The 6AG1950-2AA01-4AA0 is designed to operate as part of a weighing and automation system. The following components may be relevant to a complete installation.

The components listed above are examples of equipment that may be used in a complete system. They are not all necessarily included with the 6AG1950-2AA01-4AA0.

Alternative Models and Replacement Considerations

When replacing or upgrading the 6AG1950-2AA01-4AA0, engineers should distinguish between the SIPLUS version and its underlying standard product.

Before selecting a replacement, check:

• Exact article number and product version.
• SIMATIC S7 or ET 200M compatibility.
• Weighing channel configuration.
• Load-cell electrical characteristics.
• Sensor wiring and connection requirements.
• Measurement and calibration requirements.
• Bus and communication arrangements.
• Environmental temperature and humidity conditions.
• Conformal coating requirements.
• Software and configuration compatibility.

A standard SIWAREX U module may share the underlying weighing functionality with its SIPLUS counterpart, but it should not automatically be considered equivalent for installations that require the additional environmental protection of the SIPLUS version.

Key Advantages

Integration with Siemens Automation

The module is designed for integration into SIMATIC S7 and ET 200M automation environments, allowing weighing tasks to become part of a wider PLC-based control system.

Industrial Weighing Functionality

The SIWAREX U product family supports simple weighing and force measurement tasks, making it suitable for selected industrial measurement applications.

SIPLUS Environmental Design

The conformal coating on printed circuit boards and electronic components provides additional protection against specified environmental influences.

Compact Hardware Design

With supplied dimensions of 130 × 150 × 49 mm and a weight of 0.282 kg, the module can be incorporated into suitable automation installations without requiring a large amount of physical space.

Flexible Process Integration

Weighing information can be used by the PLC as part of material monitoring, filling, batching, and production-control sequences.

Established Siemens Platform

The SIWAREX U family provides a dedicated weighing solution within the Siemens automation ecosystem, helping engineers integrate measurement functions into existing control architectures.

Technical FAQs

1. What is the Siemens 6AG1950-2AA01-4AA0?

It is a SIPLUS SIWAREX U electronic weighing system designed for industrial weighing and force measurement applications. It is based on the standard Siemens 7MH4950-2AA01 model.

2. What is the difference between 6AG1950-2AA01-4AA0 and 7MH4950-2AA01?

The 6AG1950-2AA01-4AA0 is the SIPLUS version of the standard 7MH4950-2AA01. It includes conformal coating on printed circuit boards and electronic components and has specified SIPLUS environmental characteristics.

3. Which automation systems can use this module?

The product is designed for integration into Siemens SIMATIC S7 and ET 200M automation systems. Confirm the exact hardware configuration and compatibility before installation.

4. What is the main function of the SIWAREX U?

The SIWAREX U is used for simple weighing and force measurement tasks. It processes weighing-related signals and supports integration of measurement functions into a SIMATIC automation system.

5. Does the module include conformal coating?

Yes. The SIPLUS version includes coating on its printed circuit boards and electronic components.

6. What is its operating temperature range?

The specified SIPLUS ambient temperature range is 0 to +60 °C. Refer to the applicable Siemens documentation for all environmental and installation conditions.

7. Can the module be used in high-humidity environments?

The product documentation specifies relative humidity up to 100%, with condensation and frost permitted under the stated conditions. However, the module must not be commissioned while in a dew-covered state. The complete installation conditions should be checked before use.

8. What sensors are used with this module?

Industrial weighing applications commonly use compatible load cells. The exact sensor type, electrical characteristics, capacity, and wiring arrangement must be selected according to the module’s technical documentation and application requirements.

9. Does the module require calibration?

Yes. A weighing system must be configured and calibrated according to the application and sensor arrangement. Calibration helps ensure that the measurement results correspond to the applied load.

10. Is 6AG1950-2AA01-4AA0 a standard S7-300 digital input module?

No. It is a dedicated electronic weighing system in the SIPLUS SIWAREX U family. Its function is different from that of a conventional digital input module.

Procurement and Maintenance Recommendations

When purchasing the Siemens 6AG1950-2AA01-4AA0, verify the complete article number on the product label. The SIPLUS designation is important because this version includes conformal coating and specific environmental characteristics.

For replacement projects, compare the module with the original installed hardware and confirm that the underlying SIWAREX U weighing functions, automation platform, sensor connections, and software configuration are suitable.

For used or surplus equipment, request clear photographs of the nameplate, terminals, housing, and connector area. Check for signs of physical damage, corrosion, contamination, or previous repairs. Where possible, request evidence of functional testing and confirm the condition of the electrical connections.

During maintenance, inspect the module and associated weighing sensors according to the equipment manufacturer’s recommendations. Check cable shielding, grounding, sensor connections, mounting stability, and calibration records. Changes to the mechanical weighing structure or sensor arrangement may require recalibration.

For applications in humid or environmentally demanding locations, ensure that the installation conditions remain within the specified SIPLUS operating limits. Do not assume that conformal coating removes the need for appropriate cabinet design, wiring protection, and environmental management.

Conclusion

The Siemens 6AG1950-2AA01-4AA0 SIPLUS SIWAREX U is an electronic weighing module designed for integration into SIMATIC S7 and ET 200M automation systems. Based on the standard 7MH4950-2AA01, it supports industrial weighing and force measurement tasks while adding conformal coating to its printed circuit boards and electronic components.

With a specified SIPLUS ambient temperature range of 0 to +60 °C, the module is intended for applications that require the SIWAREX U weighing functionality together with additional environmental protection. Accurate model identification, sensor compatibility, calibration, and correct system integration are essential for reliable operation in industrial weighing applications.