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- Siemens
- 6AG1131-6FD01-7BB1
- Digital Input Module
- Germany
- 20 × 73 × 58 mm
- 0.036 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Siemens 6AG1131-6FD01-7BB1 is a SIPLUS ET 200SP digital input module designed for industrial automation systems requiring reliable acquisition of 120 to 230 V AC digital signals. The module provides four digital input channels and is identified as DI 4x 120…230 V AC ST.
As part of the Siemens SIPLUS product family, this module is designed for applications where increased environmental protection is required. Its conformal-coated electronics provide additional protection against industrial contamination and environmental stress.
The 6AG1131-6FD01-7BB1 is based on the standard SIMATIC ET 200SP 6ES7131-6FD01-0BB1 design while providing enhanced SIPLUS environmental characteristics.
With its compact size of 20 × 73 × 58 mm and module weight of approximately 0.036 kg, the unit is suitable for space-saving distributed I/O installations.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Siemens |
| Product Family | SIPLUS ET 200SP |
| Model | 6AG1131-6FD01-7BB1 |
| Product Type | Digital Input Module |
| Module Designation | DI 4x 120…230 V AC ST |
| Number of Inputs | 4 |
| Input Type | Digital AC Input |
| Rated Input Voltage | 230 V AC |
| Input Voltage Range | 187…264 V AC |
| Input Frequency | 50 / 60 Hz |
| Input Current | Approx. 10 mA |
| Signal Delay | Approx. 1.5…8 ms |
| BaseUnit | BU Type B1 |
| Color Code | CC41 |
| Diagnostics | Yes |
| Conformal Coating | Yes |
| Width | 20 mm |
| Height | 73 mm |
| Depth | 58 mm |
| Dimensions | 20 × 73 × 58 mm |
| Weight | 0.036 kg |
| Installation | ET 200SP distributed I/O station |
| Application | Industrial automation |
| Based On | 6ES7131-6FD01-0BB1 |
Function and Working Principle
The main function of the 6AG1131-6FD01-7BB1 is to detect the ON/OFF state of four AC field signals and transfer this information to the PLC through an ET 200SP distributed I/O system.
The basic signal path is:
Field Device → Digital Input Module → ET 200SP Station → PLC Controller
When an appropriate AC voltage is applied to an input channel, the module detects the electrical state and converts it into a digital signal that can be processed by the automation controller.
Typical input signals can originate from:
- Contactors
- Relays
- Limit switches
- Motor control circuits
- Auxiliary contacts
- Industrial switching devices
- Machine status signals
The module is specifically intended for 120…230 V AC applications, so it should not be selected for standard 24 V DC input requirements.
Role in Industrial Control Systems
The Siemens 6AG1131-6FD01-7BB1 functions as a field-level interface between AC electrical devices and the PLC control system.
A typical architecture is:
Industrial Equipment → ET 200SP I/O → PROFINET / Industrial Network → PLC → HMI / SCADA
The module allows the controller to monitor the status of field equipment without directly connecting high-voltage AC signals to the PLC CPU.
For example, an auxiliary contact from a motor starter can be connected to one input channel. When the contactor changes state, the module detects the corresponding AC signal and reports the digital status to the controller.
This allows the PLC to determine whether equipment is running, stopped, energized, or in another defined operating state.
SIPLUS Environmental Design
One of the major characteristics of the 6AG1131-6FD01-7BB1 is its SIPLUS design.
Compared with a conventional ET 200SP module, the SIPLUS version is designed for applications where the electronic equipment may encounter more demanding environmental conditions.
The module features conformal coating, which helps protect the electronic circuitry from environmental influences such as:
- Humidity
- Dust
- Industrial contamination
- Oil
- Chemically active substances
- Other environmental stresses
This makes the module particularly suitable for industrial installations where standard electronic protection may not be sufficient.
The actual environmental suitability should always be evaluated according to the conditions of the specific installation.
Industrial Applications
The Siemens 6AG1131-6FD01-7BB1 can be used in many industrial automation applications.
Manufacturing Automation
The module can monitor AC-operated contactors, relays, machine switches, and equipment status signals.
Motor Control
Motor starters and contactors often provide auxiliary status signals that can be monitored through digital inputs.
Process Automation
The module can collect discrete status information from process equipment and transfer it to the PLC.
Power and Utility Systems
Industrial electrical systems can use the module to monitor switching and equipment status.
Chemical and Petrochemical Plants
The SIPLUS environmental design makes this module suitable for selected applications where contamination and environmental stress are concerns.
Heavy Industry
Steel, mining, material handling, and other industrial facilities can use distributed I/O modules to collect equipment status signals close to the field devices.
Installation and System Integration
The 6AG1131-6FD01-7BB1 is designed for use in the Siemens ET 200SP distributed I/O system.
A suitable BU Type B1 BaseUnit is required for installation.
The general installation process includes:
- Install the appropriate ET 200SP BaseUnit.
- Mount the digital input module onto the BaseUnit.
- Connect the required AC field signals.
- Integrate the module into the PLC hardware configuration.
- Configure the ET 200SP station.
- Test each input channel during commissioning.
Because the module handles up to 230 V AC signals, wiring and commissioning must be performed using appropriate industrial electrical safety procedures.
Before maintenance or replacement, the relevant power sources must be isolated and verified as de-energized.
Compatible System Components
The 6AG1131-6FD01-7BB1 is normally used together with other Siemens automation components.
| Component | Function |
|---|---|
| ET 200SP BU Type B1 | BaseUnit and field wiring interface |
| ET 200SP Interface Module | Network connection for distributed I/O |
| SIMATIC PLC | Processes digital input information |
| ET 200SP Digital Output Modules | Controls field devices |
| ET 200SP Analog Modules | Handles analog signals |
| PROFINET Network | Industrial communication |
| Contactors | Motor and equipment switching |
| Relays | Switching and status signals |
| Limit Switches | Machine position/status detection |
| HMI | Operator monitoring and control |
These components can be combined to create a complete distributed automation system.
Recommended Alternative Models
The best alternative depends on the required input voltage, channel count, environmental conditions, and application.
| Model | Type | Key Feature | Application |
|---|---|---|---|
| 6AG1131-6FD01-7BB1 | SIPLUS Digital Input | 4 × 120…230 V AC | Harsh-environment AC input |
| 6ES7131-6FD01-0BB1 | ET 200SP Digital Input | 4 × 120…230 V AC | Standard AC input |
| 6AG1131-6BF01-7BA0 | SIPLUS Digital Input | 8 × 24 V DC | Harsh-environment DC input |
| 6AG1131-6BH01-7BA0 | SIPLUS Digital Input | 16 × 24 V DC | High-density DC input |
| 6AG1131-6BF00-7CA0 | SIPLUS Digital Input | 8 × 24 V DC HF | High-speed DC applications |
| 6AG1131-6TF00-7CA0 | SIPLUS Digital Input | 8 × NAMUR | Sensor and monitoring applications |
The 6ES7131-6FD01-0BB1 is the closest standard Siemens product comparison because the SIPLUS 6AG1131-6FD01-7BB1 is based on this ET 200SP digital input design.
However, the SIPLUS version should be selected when its enhanced environmental characteristics are required.
Key Advantages
- Four independent 120…230 V AC digital inputs
- Compact 20 × 73 × 58 mm design
- Approximately 0.036 kg module weight
- Designed for Siemens ET 200SP systems
- Compatible with BU Type B1 BaseUnit
- Conformal-coated SIPLUS electronics
- Suitable for demanding industrial environments
- Integrated diagnostic capabilities
- Useful for motor control and machine status monitoring
- Suitable for distributed automation architectures
Technical FAQs
What is Siemens 6AG1131-6FD01-7BB1?
It is a SIPLUS ET 200SP digital input module with four 120…230 V AC digital input channels.
How many inputs does it have?
The module provides four digital inputs.
What is the rated input voltage?
The rated input voltage is 230 V AC, with an applicable input range of approximately 187…264 V AC.
What are the dimensions?
The module measures approximately 20 × 73 × 58 mm.
How much does it weigh?
The module weighs approximately 0.036 kg, or 36 grams.
What BaseUnit is required?
The module is designed for use with a BU Type B1 BaseUnit.
Is it a 24 V DC input module?
No. The 6AG1131-6FD01-7BB1 is designed for 120…230 V AC digital signals.
What is the difference between 6AG1131-6FD01-7BB1 and 6ES7131-6FD01-0BB1?
The 6AG1131-6FD01-7BB1 is the SIPLUS version based on the standard ET 200SP 6ES7131-6FD01-0BB1 design and provides enhanced environmental protection characteristics.
Is the module suitable for harsh industrial environments?
It is designed with SIPLUS environmental protection features, including conformal coating, making it suitable for selected demanding industrial applications.
What is the module mainly used for?
It is mainly used to acquire 120…230 V AC ON/OFF signals from industrial equipment and transfer those signals to a Siemens PLC through an ET 200SP distributed I/O system.
Conclusion
The Siemens 6AG1131-6FD01-7BB1 SIPLUS ET 200SP Digital Input Module is a compact four-channel AC digital input module designed for industrial automation systems.
Its 120…230 V AC input capability, 20 × 73 × 58 mm dimensions, approximately 0.036 kg weight, ET 200SP integration, and SIPLUS conformal-coated construction make it suitable for industrial applications where reliable AC signal acquisition and enhanced environmental protection are required.
The module is particularly useful for monitoring contactors, relays, motor control circuits, machine status signals, and other AC switching devices.
For replacement or new installations, engineers should verify the required input voltage, BaseUnit, ET 200SP configuration, environmental conditions, and complete system architecture before selecting the module.