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- Siemens
- 6ES7131-6BF61-0AA0
- Digital Input Module
- Germany
- 15 × 73 × 58 mm
- 0.036 kg
- Xiamen, China
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Product Overview
The Siemens 6ES7131-6BF61-0AA0 is a SIMATIC ET 200SP digital input module with eight 24 V DC inputs and a source-input configuration identified as NPN, M-reading. It collects discrete signals from compatible field devices and makes their states available to the PLC through the ET 200SP distributed I/O station.
The input configuration is the main consideration when selecting this module. In a machine using NPN-output proximity sensors, for example, the input circuit must be arranged so that the sensor output and module share the correct electrical reference and current path. This differs from the wiring commonly used with PNP-oriented input modules, so the module should be selected according to the installed sensors rather than channel count alone.
On a conveyor or assembly line, the module can acquire signals indicating product presence, fixture position, or the completion of a machine movement. The PLC evaluates those states and determines whether to advance the sequence, activate an output, or wait for another condition. The input module handles signal acquisition; it does not independently control the machine sequence.
The 6ES7131-6BF61-0AA0 supports configurable input delays from 0.05 to 20 ms per channel. This gives the engineer a way to adjust signal recognition to the connected device and required response time. Module diagnostics also provide information about supply-voltage conditions, which can help narrow down faults during commissioning and maintenance.
As part of the ET 200SP Basic range, the module supports standard digital input acquisition rather than dedicated high-speed counting or oversampling. It fits a compatible type A0 BaseUnit and can be integrated into a distributed I/O station configured for the required controller and communication system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES7131-6BF61-0AA0 |
| Product Family | SIMATIC ET 200SP |
| Product Type | Digital Input Module |
| Module Designation | DI 8x 24 V DC SRC BA |
| Number of Digital Inputs | 8 |
| Rated Input Voltage | 24 V DC |
| Permissible Supply Voltage | 19.2–28.8 V DC |
| Input Characteristic | Type 1 according to IEC 61131 |
| Input Configuration | Source input (NPN, M-reading) |
| Configurable Input Delay | 0.05–20 ms per channel |
| Module Diagnostics | Supply-voltage monitoring |
| Counter Function | Not supported |
| Oversampling | Not supported |
| Isochronous Mode | Not supported |
| Compatible BaseUnit | Type A0 |
| Color Code | CC02 |
| Dimensions | 15 × 73 × 58 mm |
| Weight | 0.036 kg |
Product Features
- Eight 24 V DC inputs: Acquires discrete signals from compatible switches and sensors.
- Source-input configuration: Supports NPN-oriented field circuits when the sensor output and wiring match the module requirements.
- Adjustable input delay: Allows channel-specific settings from 0.05 to 20 ms.
- Supply-voltage diagnostics: Helps identify supported supply-related faults.
- Basic digital input operation: Collects ordinary on/off signals for PLC control logic.
- ET 200SP integration: Fits a compatible type A0 BaseUnit within a distributed I/O station.
- Field-device compatibility: Supports switches and two-wire sensors that meet the specified electrical requirements.
- Engineering configuration: Supports parameter assignment through compatible Siemens engineering tools.
Working Principle
The 6ES7131-6BF61-0AA0 receives electrical signals from field devices and converts them into digital input states for the PLC. The source-input configuration determines how the sensor output, supply reference, and module input must be connected.
A typical signal path is:
NPN-Compatible Field Sensor → 6ES7131-6BF61-0AA0 → ET 200SP Backplane → Interface Module → PLC
Consider a proximity sensor monitoring a component on an assembly fixture. When the component reaches the detection point, the sensor changes its output state. The module registers the corresponding electrical signal and transfers the input information through the I/O station. The PLC then evaluates the signal alongside other machine conditions before allowing the next step.
The configured input delay affects when a transition is accepted. A suitable delay can help prevent short disturbances from being treated as valid changes, especially where signal wiring passes near electrically noisy equipment. However, increasing the delay also postpones recognition of genuine events. The setting should therefore reflect both the sensor’s switching behavior and the machine’s timing requirements.
Correct wiring is particularly important with this module. A circuit designed for a PNP input arrangement should not be transferred directly without checking the electrical differences. The sensor output type, common reference, field supply, and terminal assignment must all match the intended source-input circuit.
If an input remains inactive, troubleshooting should begin with the field sensor and its supply, followed by the wiring, configured input delay, and module diagnostics. Since this model does not support dedicated counter or oversampling operation, applications requiring those functions should use an input module with the corresponding feature set.
Role in the SIMATIC ET 200SP Control Architecture
The 6ES7131-6BF61-0AA0 collects discrete signals from compatible NPN-oriented field circuits and makes the resulting input data available to the automation controller. Its function is limited to signal acquisition and the module features specified for this variant.
Field Sensors → Digital Input Module → ET 200SP Interface Module → PLC → Machine Control Sequence
| System Element | Function |
|---|---|
| NPN-Compatible Sensors | Generate discrete signals representing position, presence, or machine status |
| 6ES7131-6BF61-0AA0 | Acquires eight 24 V DC input signals |
| ET 200SP BaseUnit, Type A0 | Provides the module’s mounting and electrical connection interface |
| ET 200SP Interface Module | Connects the distributed I/O station to the controller network |
| PLC or Automation Controller | Processes input states and executes the machine program |
| 24 V DC Field Supply | Powers compatible sensors and associated circuits |
| Field Wiring and Common Reference | Establish the electrical path required by the input configuration |
| TIA Portal or Compatible Engineering Software | Configures hardware and supported input parameters |
| Digital Output Modules | Switch compatible actuators according to PLC commands |
Industrial Applications
| Application | Practical Use |
|---|---|
| Conveyor Systems | Reading object-detection and transfer-position signals |
| Assembly Machinery | Monitoring component presence and fixture positions |
| Automated Material Handling | Acquiring discrete feedback from handling equipment |
| Packaging Equipment | Detecting products and checking machine sequence conditions |
| NPN Sensor-Based Machines | Collecting signals from compatible NPN-output sensors |
| Production Test Stations | Reading switch states and discrete test conditions |
| Machine Tool Peripherals | Acquiring compatible proximity-sensor and limit-switch signals |
| Industrial Sorting Systems | Detecting items at transfer and sorting points |
| Distributed Control Cabinets | Adding digital input channels near the equipment |
| Existing ET 200SP Installations | Maintaining input circuits where the source-input configuration is required |
Installation and Maintenance
- Verify the complete order number: Confirm 6ES7131-6BF61-0AA0 before installation or replacement, particularly when distinguishing it from PNP-oriented ET 200SP modules.
- Confirm sensor output compatibility: Check that connected sensors use an output arrangement compatible with the module’s source-input configuration.
- Select the appropriate BaseUnit: Verify the type A0 BaseUnit and the intended ET 200SP station arrangement.
- Isolate the station: Follow the approved electrical isolation procedure before inserting the module or changing field connections.
- Check the wiring diagram: Match each input terminal, supply conductor, and common reference to the correct connection arrangement.
- Verify the field supply: Confirm that the supply voltage is within the permitted range and that the reference connections are correct for the input circuit.
- Set the input delays: Select values between 0.05 and 20 ms according to sensor switching behavior and machine response requirements.
- Inspect field wiring: Check for loose terminals, damaged insulation, incorrect connections, and signal cables routed near sources of electrical interference.
- Configure the engineering project: Verify the module order number, station position, input addresses, and supported parameters.
- Test each channel: Operate the connected sensors and confirm that the corresponding PLC input states change correctly.
- Investigate missing signals: Check sensor compatibility, supply voltage, common-reference wiring, terminal assignments, and diagnostic indications.
- Record commissioning results: Document the sensor types, wiring arrangement, input-delay settings, and test results for future maintenance.
Compatible System Components
| Component | Function |
|---|---|
| Siemens 6ES7131-6BF61-0AA0 | Acquires eight digital input signals using the specified source-input configuration |
| SIMATIC ET 200SP BaseUnit, Type A0 | Provides module mounting and electrical connections |
| SIMATIC ET 200SP Interface Module | Connects the I/O station to the controller network |
| SIMATIC S7-1200 PLC | Processes input information in compatible machine-control systems |
| SIMATIC S7-1500 PLC | Executes machine and process-control logic |
| 24 V DC Power Supply | Supplies compatible sensors and associated field circuits |
| NPN-Output Proximity Sensors | Detect component presence or position |
| Compatible Photoelectric Sensors | Generate discrete signals matching the module’s electrical requirements |
| Mechanical Limit Switches | Provide position feedback when the wiring arrangement is compatible |
| Terminal Blocks and Field Wiring | Connect sensors and supply conductors to the I/O station |
| TIA Portal | Supports hardware configuration and input parameter assignment |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Siemens 6ES7131-6BF61-0AA0 | SIMATIC ET 200SP DI 8x 24 V DC SRC BA | Eight-channel source-input acquisition for compatible NPN-oriented circuits |
| Siemens 6ES7131-6BF01-0AA0 | SIMATIC ET 200SP DI 8x 24 V DC BA | Basic digital input acquisition with a different input configuration |
| Siemens 6ES7131-6BF01-0BA0 | SIMATIC ET 200SP DI 8x 24 V DC ST | Standard eight-channel digital input applications |
| Siemens 6ES7131-6BF00-0CA0 | SIMATIC ET 200SP DI 8x 24 V DC HF | Applications requiring High Feature input functions |
| Siemens 6ES7131-6BF00-0DA0 | SIMATIC ET 200SP DI 8x 24 V DC HS | Applications requiring supported high-speed input modes |
| Siemens 6ES7131-6BH01-0BA0 | SIMATIC ET 200SP DI 16x 24 V DC ST | Applications requiring 16 digital input channels |
Key Advantages
- Eight 24 V DC digital inputs for compatible source-input circuits.
- Configurable input delays for different sensor response characteristics.
- Supply-voltage diagnostics for supported fault conditions.
- Integration with the SIMATIC ET 200SP distributed I/O platform.
- A specific input configuration for installations using compatible NPN-output devices.
Technical FAQs
What does SRC BA identify on the 6ES7131-6BF61-0AA0?
SRC BA identifies the Basic source-input variant, specified as DI 8x 24 V DC SRC BA. The module uses an NPN-oriented, M-reading input configuration and is intended for compatible field circuits.
Can this module directly replace a PNP-oriented ET 200SP digital input module?
Not automatically. The source-input arrangement differs from the PNP-oriented configuration used by many standard digital input modules. Before replacement, compare the sensor output type, electrical reference, terminal assignment, and field wiring.
How does the configurable input delay affect machine operation?
The input delay determines the configured recognition behavior for a signal transition. A suitable setting can help reject brief unwanted transitions, but an excessive delay may cause the PLC to receive a valid state change later than the machine sequence requires.
Is this module suitable for high-speed pulse counting?
It is not intended for dedicated counter or oversampling operation. If the application requires those functions, evaluate a compatible High Speed input module and verify its operating modes against the signal-processing requirements.