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- Siemens
- 6AG1131-6BF61-7AA0
- Digital Input Module
- Germany
- 15 × 73 × 58 mm
- 0.028 kg
- Xiamen, China
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Product Overview
Reliable digital signal acquisition is essential for modern industrial automation systems, particularly where field sensors and switching devices must be integrated into a distributed PLC architecture. The Siemens 6AG1131-6BF61-7AA0 is a SIPLUS ET 200SP digital input module designed for acquiring 24 V DC binary signals from industrial field devices.
The module provides 8 digital inputs and is based on the 6ES7131-6BF61-0AA0 platform. Its SIPLUS design incorporates conformal coating and an extended operating temperature range of -40 °C to +70 °C, making it suitable for demanding industrial environments.
A key characteristic of this model is its source-input configuration, with an NPN, sourcing input arrangement and an IEC 61131 Type 1 input characteristic. It is designed for use with BU Type A0 BaseUnits within the ET 200SP distributed I/O system.
With its compact form factor, the 6AG1131-6BF61-7AA0 can be installed close to field equipment, allowing digital signals to be collected efficiently before being transferred through the ET 200SP station to the PLC or higher-level automation controller.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Siemens |
| Model | 6AG1131-6BF61-7AA0 |
| Product Family | SIPLUS ET 200SP |
| Product Type | Digital Input Module |
| Product Designation | DI 8×24 V DC SRC BA |
| Standard Base Model | 6ES7131-6BF61-0AA0 |
| Number of Digital Inputs | 8 |
| Rated Input Voltage | 24 V DC |
| Permitted Input Voltage Range | 19.2 to 28.8 V DC |
| Input Type | Digital Input |
| Source / Sink Configuration | Sourcing input |
| Input Characteristic | Type 1 according to IEC 61131 |
| Input Current at Signal 1 | Approx. 6 mA |
| Input Delay | 0.05 to 20 ms |
| Reverse Polarity Protection | Yes |
| Encoder Supply Short-Circuit Protection | No |
| Power Loss | Approx. 1.5 W |
| Address Space | 1 byte input data |
| Parameterizable Inputs | Yes |
| BaseUnit Compatibility | BU Type A0 |
| Color Code | CC02 |
| Diagnostics | Supply voltage diagnostics |
| Conformal Coating | Yes |
| Operating Temperature | -40 °C to +70 °C |
| Installation | ET 200SP distributed I/O station |
| Dimensions | 15 × 73 × 58 mm |
| Weight | Approx. 0.040 kg / 40 g |
| Protection Rating | IP20 |
| Application | Industrial digital signal acquisition |
| System Architecture | Siemens ET 200SP distributed I/O |
Weight note: The supplied product listing may show 0.028 kg, but the technical product data for this specific 6AG1131-6BF61-7AA0 identifies the module weight at approximately 0.040 kg. For a technical product page, the latter value is the safer specification to use.
Function and Working Principle
The Siemens 6AG1131-6BF61-7AA0 receives binary signals from field devices and transfers their status into the ET 200SP automation architecture.
Its eight channels are designed for 24 V DC digital input signals. Depending on the application, the module can receive signals from proximity sensors, switches, position devices, auxiliary contacts, and other compatible industrial field equipment.
The basic signal path can be represented as:
Field Device → 24 V DC Digital Signal → 6AG1131-6BF61-7AA0 → ET 200SP Backplane → Interface Module → PLC / Controller
When a field device changes its electrical state, the corresponding input channel detects the signal. The module then makes the input information available to the ET 200SP station for transfer to the higher-level controller.
The module supports a configurable input delay of 0.05 to 20 ms, allowing the digital input response to be adapted to different signal characteristics.
Unlike a general-purpose digital input module, this model is specifically identified as a SOURCE input module, making correct sensor and field-device wiring particularly important during system design and commissioning.
Role in Industrial Control Systems
The 6AG1131-6BF61-7AA0 provides an interface between field-level switching devices and a PLC-based control system.
Typical signals collected by the module can include:
- Proximity sensor status
- Position sensor signals
- Limit switch feedback
- Motor running status
- Valve position feedback
- Machine operating status
- Push-button commands
- Auxiliary contact signals
- Equipment interlock status
- Pressure switch signals
- Level switch signals
- Production machine feedback
The distributed ET 200SP architecture allows the module to be installed closer to the equipment generating these signals. This can reduce the length of individual field cables and simplify control cabinet wiring.
The module’s diagnostic capability also helps maintenance personnel identify supply-voltage-related problems during operation.
Industrial Applications
The Siemens 6AG1131-6BF61-7AA0 can be used in many industrial automation applications, including:
- Factory automation
- Machine control
- Production lines
- Packaging machinery
- Conveyor systems
- Material handling equipment
- Assembly machines
- Process automation
- Motor control systems
- Industrial monitoring
- Distributed PLC systems
- Manufacturing equipment
- Control panels
- Environmentally demanding automation installations
Its SIPLUS construction and conformal coating make it particularly suitable for applications where environmental conditions may exceed the requirements of standard automation components.
The extended -40 °C to +70 °C operating temperature range also makes the module suitable for applications exposed to significant temperature variation.
Installation and System Integration
The 6AG1131-6BF61-7AA0 is designed as an electronic module within the Siemens ET 200SP distributed I/O system.
A typical installation includes:
- Install the ET 200SP station on the appropriate DIN rail.
- Select a compatible BU Type A0 BaseUnit.
- Install the BaseUnit in the required position.
- Mount the 6AG1131-6BF61-7AA0 onto the BaseUnit.
- Connect the 24 V DC field signals according to the application wiring design.
- Verify the source-input wiring and signal reference arrangement.
- Connect the ET 200SP station to the appropriate interface and PLC architecture.
- Configure the module within the automation engineering environment.
- Check the input states and available diagnostic information.
- Test each field device before placing the machine into normal operation.
Because this module uses a source-input configuration, the field wiring should be checked carefully before energizing the system. Incorrect wiring can result in incorrect input states or unexpected machine behavior.
The module itself is not intended to function as a standalone PLC input device. The appropriate BaseUnit and ET 200SP system components are required.
During replacement, technicians should verify the module number, BaseUnit, station configuration, field wiring, controller configuration, and environmental requirements before removing the original unit.
Compatible System Components
The 6AG1131-6BF61-7AA0 normally operates together with the following ET 200SP and field-level components:
| Component | Function |
| ET 200SP BU Type A0 BaseUnit | Mechanical and electrical interface for the electronic module |
| ET 200SP Interface Module | Connects the distributed I/O station with the higher-level control network |
| ET 200SP Server Module | Supports station-end configuration where required |
| 24 V DC Power Supply | Provides the required system and field voltage |
| Siemens PLC / Controller | Processes digital input information |
| Proximity Sensors | Provide machine-position signals |
| Position Sensors | Detect equipment position |
| Limit Switches | Provide travel and position feedback |
| Auxiliary Contacts | Provide equipment-status signals |
| Push Buttons | Provide operator commands |
| ET 200SP Backplane | Provides internal communication between station modules |
The exact system configuration depends on the selected interface module, BaseUnit, controller, communication architecture, and field-device requirements.
Recommended Alternative Models
The following models and product families may be considered when designing or maintaining Siemens distributed digital input systems. They should not automatically be regarded as direct substitutes because input configuration, BaseUnit compatibility, environmental specifications, and electrical characteristics must be checked.
| Model | Type | Key Feature | Application |
| 6AG1131-6BF61-7AA0 | SIPLUS ET 200SP Digital Input | 8 × 24 V DC source inputs, conformal coating | Demanding industrial environments |
| 6ES7131-6BF61-0AA0 | ET 200SP Digital Input | Standard platform with 8 × 24 V DC inputs | General ET 200SP applications |
| 6AG1131-6BF01-7BA0 | SIPLUS ET 200SP Digital Input | 8 × 24 V DC digital inputs | Standard SIPLUS distributed I/O applications |
| 6AG1131-6BF00-7CA0 | SIPLUS ET 200SP Digital Input | 8 × 24 V DC high-feature inputs | Advanced distributed I/O applications |
| 6AG1131-6BH01-7BA0 | SIPLUS ET 200SP Digital Input | 16 × 24 V DC inputs | Applications requiring higher channel density |
The 6ES7131-6BF61-0AA0 is the most directly related standard platform for the 6AG1131-6BF61-7AA0. However, the standard and SIPLUS versions should not be considered automatically interchangeable because environmental conditions and the required SIPLUS characteristics must be evaluated.
Key Advantages
- Provides 8 digital input channels
- Designed for 24 V DC field signals
- Uses a source-input configuration
- Supports Type 1 input characteristics according to IEC 61131
- Provides configurable 0.05 to 20 ms input delay
- Supports parameterizable digital inputs
- Includes supply-voltage diagnostics
- Designed for Siemens ET 200SP architecture
- Compatible with BU Type A0 BaseUnits
- Conformal-coated SIPLUS construction
- Extended operating temperature range of -40 °C to +70 °C
- Compact 15 × 73 × 58 mm design
- Suitable for distributed machine-level I/O
- Supports common industrial sensors and switching devices
- Suitable for demanding industrial automation environments
Technical FAQs
What is the Siemens 6AG1131-6BF61-7AA0?
The Siemens 6AG1131-6BF61-7AA0 is a SIPLUS ET 200SP DI 8×24 V DC source-input module designed for distributed digital signal acquisition in industrial automation systems.
How many digital inputs does it provide?
The module provides 8 digital input channels.
What is the rated input voltage?
The module is designed for a nominal 24 V DC input voltage, with a permissible range of approximately 19.2 to 28.8 V DC.
What are the dimensions of the 6AG1131-6BF61-7AA0?
The module dimensions are approximately 15 × 73 × 58 mm.
How much does the module weigh?
The technical product data specifies a weight of approximately 0.040 kg, or 40 g.
What type of input does the module use?
The module uses a sourcing input configuration with an NPN, sourcing input arrangement and an IEC 61131 Type 1 input characteristic.
What BaseUnit is compatible with this module?
The 6AG1131-6BF61-7AA0 is designed for use with a BU Type A0 BaseUnit.
What is the input delay?
The input delay is configurable within a range of approximately 0.05 to 20 ms.
Does the module provide diagnostic functions?
Yes. The module provides diagnostic functionality related to the supply voltage.
Is the module suitable for harsh industrial environments?
Yes. The SIPLUS design includes conformal coating and an extended operating temperature range of -40 °C to +70 °C, making it suitable for demanding environmental conditions.
What is the standard module associated with the SIPLUS version?
The 6AG1131-6BF61-7AA0 is based on the 6ES7131-6BF61-0AA0 digital input platform.
Can the 6AG1131-6BF61-7AA0 operate without a BaseUnit?
No. It is an electronic module designed for the ET 200SP distributed I/O system and requires a compatible BaseUnit and the appropriate station components.
Is the 6AG1131-6BF61-7AA0 the same as the 6AG1131-6BF01-7BA0?
No. Both are SIPLUS ET 200SP digital input modules, but they have different electrical input configurations. The 6AG1131-6BF61-7AA0 is specifically identified as a source-input module, so they should not be treated as direct replacements without checking the application wiring and system configuration.
Conclusion
The Siemens 6AG1131-6BF61-7AA0 is a compact SIPLUS ET 200SP digital input module designed for reliable acquisition of eight 24 V DC binary signals in demanding industrial automation environments.
Its combination of 8 digital inputs, source-input configuration, 24 V DC operation, 15 × 73 × 58 mm dimensions, approximately 40 g weight, configurable 0.05 to 20 ms input delay, supply-voltage diagnostics, conformal coating, and -40 °C to +70 °C operating temperature range makes it a practical solution for distributed machine and process I/O.
By connecting field sensors, switches, position devices, and equipment-status contacts to an ET 200SP station, the 6AG1131-6BF61-7AA0 provides a structured interface between field equipment and PLC-based control systems. Its source-input design also makes correct field wiring an important consideration during installation and commissioning.
For replacement applications, engineers should verify the complete ET 200SP station configuration, BU Type A0 BaseUnit, input wiring, controller architecture, environmental requirements, and the original module’s electrical configuration before selecting a replacement.