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- 6ES7131-6BF01-0BA0
- Digital Input Module
- Germany
- 15 × 73 × 58 mm
- 0.036 kg
- Xiamen, China
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Product Overview
The Siemens 6ES7131-6BF01-0BA0 is a SIMATIC ET 200SP standard digital input module with eight 24 V DC inputs. It collects binary signals from field devices and transfers their states to the controller through the distributed I/O station. Typical signals include proximity sensors, mechanical limit switches, pushbuttons, and auxiliary contacts used to monitor machine conditions.
In a conveyor system, the module can read product-detection signals at transfer points and provide the PLC with the information needed to advance the handling sequence. On an assembly machine, it can collect fixture-position and part-presence signals before the controller permits the next operation. Its eight channels provide a compact way to bring multiple discrete signals into one ET 200SP station.
The module supports configurable input delays from 0.05 to 20 ms per channel. This allows engineers to adjust signal filtering for different field devices. A short delay can be suitable for signals requiring a quick response, while a longer setting may help suppress brief unwanted transitions from mechanical contacts or electrically noisy signal lines.
The 6ES7131-6BF01-0BA0 also supports diagnostics for conditions including sensor-supply short circuits, wire breaks, and supply-voltage faults. Its integrated 24 V DC encoder supply can power compatible field devices within the specified current limit. These features are useful when troubleshooting a machine where a missing input could originate from the sensor, field wiring, or supply circuit rather than the module itself.
The module belongs to the ET 200SP Standard input range and fits a compatible type A0 BaseUnit. It is intended for ordinary automation signals, not safety-rated input processing or dedicated high-speed counting tasks.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES7131-6BF01-0BA0 |
| Product Family | SIMATIC ET 200SP |
| Product Type | Digital Input Module |
| Module Designation | DI 8x 24 V DC ST |
| Number of Digital Inputs | 8 |
| Rated Input Voltage | 24 V DC |
| Permissible Supply Voltage | 19.2–28.8 V DC |
| Input Characteristic | Type 3 according to IEC 61131 |
| Input Configuration | Sink input (PNP, P-reading) |
| Configurable Input Delay | 0.05–20 ms |
| Integrated Encoder Supply | 24 V DC |
| Maximum Encoder Supply Current | 700 mA per module |
| Encoder Supply Short-Circuit Protection | Supported |
| Module Diagnostics | Sensor-supply short circuit, wire break, supply voltage |
| Counter Function | Not supported |
| Oversampling | Not supported |
| Compatible BaseUnit Type | A0 |
| Color Code | CC01 |
| Dimensions | 15 × 73 × 58 mm |
| Weight | 0.036 kg |
Product Features
- Eight digital input channels: Collects discrete states from compatible 24 V DC sensors and switches.
- Standard input functionality: Handles ordinary machine-status and sequence-feedback signals.
- Configurable input delay: Supports per-channel settings from 0.05 to 20 ms to suit different switching characteristics.
- Integrated encoder supply: Supplies compatible field sensors through the designated 24 V DC connection.
- Supply short-circuit protection: Helps protect the integrated sensor supply when a supported short-circuit condition occurs.
- Diagnostic monitoring: Reports supported supply and wiring faults to assist maintenance.
- ET 200SP modular integration: Installs on a compatible A0 BaseUnit within a distributed I/O station.
- Engineering configuration: Supports parameter assignment through compatible Siemens engineering software.
Working Principle
The 6ES7131-6BF01-0BA0 receives discrete electrical signals from field devices and converts them into input states for the PLC. When a connected sensor changes state, the module processes the signal according to the configured input delay and makes the result available through the ET 200SP station.
A typical signal path is:
Field Sensor or Switch → 6ES7131-6BF01-0BA0 → ET 200SP Backplane → Interface Module → PLC
For example, an inductive proximity sensor may detect a metal component moving into a fixture. Its output changes state, the input module registers the transition, and the PLC uses that information to update the machine sequence. The module acquires the signal; the control program determines how the machine responds.
Input-delay adjustment is particularly useful for mechanical switches, where contact bounce may produce several rapid transitions around a single physical event. Setting a suitable delay helps prevent these short transitions from being interpreted as separate valid changes. The delay should not be set unnecessarily high, because doing so can postpone the detection of genuine input events.
The integrated encoder supply can power compatible sensors connected through the intended wiring arrangement. The total load must remain within the module’s specified capacity. If a sensor cable develops a short circuit or a supported supply fault occurs, diagnostic information can help the maintenance team locate the problem.
This standard module does not provide dedicated counter or oversampling operation. Where the application depends on high-speed pulse processing, the signal requirements should be assessed before selecting this module.
Role in the SIMATIC ET 200SP Control Architecture
The 6ES7131-6BF01-0BA0 occupies the field-input position in a distributed automation station. It gathers discrete signals from equipment around the machine and transfers the resulting input data to the PLC through the ET 200SP interface.
Field Devices → Digital Input Module → ET 200SP Interface Module → PLC → Machine Control Sequence
| System Element | Function |
|---|---|
| Field Sensors and Switches | Generate signals representing machine positions, presence, and operating states |
| 6ES7131-6BF01-0BA0 | Acquires eight standard 24 V DC digital input signals |
| ET 200SP BaseUnit, Type A0 | Provides mounting and electrical connections for the module |
| ET 200SP Interface Module | Connects the I/O station to the automation network |
| PLC or Automation Controller | Processes input states and executes machine logic |
| Integrated Encoder Supply | Supplies compatible field sensors within the specified current limit |
| Engineering Software | Configures the module and its input parameters |
| Field Wiring and Terminal Connections | Carry sensor signals and supply conductors |
| Digital Output Modules | Switch compatible actuators according to PLC commands |
Industrial Applications
| Application | Practical Use |
|---|---|
| Conveyor Systems | Reading product-presence signals and transfer-position switches |
| Packaging Machinery | Monitoring package detection and machine-position feedback |
| Assembly Equipment | Collecting fixture-position and component-presence signals |
| Automated Sorting | Detecting item arrival at sorting and transfer stations |
| Material Handling | Monitoring discrete equipment states and positioning conditions |
| Manufacturing Machinery | Acquiring ordinary feedback signals for PLC-controlled sequences |
| Pumping Systems | Reading compatible auxiliary contacts and operating-status signals |
| Industrial Fans | Monitoring discrete run-status or equipment-position signals |
| Machine Tool Peripherals | Collecting limit-switch and proximity-sensor feedback |
| Distributed Control Cabinets | Expanding digital input capacity close to the controlled equipment |
Installation and Maintenance
- Verify the complete order number: Confirm 6ES7131-6BF01-0BA0 before installation or replacement to distinguish it from related ET 200SP input variants.
- Select the compatible BaseUnit: Use a suitable type A0 BaseUnit and verify the station’s mechanical and electrical arrangement.
- Check field-device compatibility: Confirm that the connected sensors and switches meet the module’s 24 V DC input requirements and supported input characteristics.
- Isolate the station: Follow the approved electrical isolation procedure before inserting the module or changing field wiring.
- Verify terminal assignments: Match each sensor signal, supply conductor, and common connection to the applicable wiring diagram.
- Check the encoder-supply load: Calculate the combined current demand of connected sensors and keep it within the specified 700 mA module limit.
- Set input delays: Choose suitable delay values for the connected devices and required machine response time.
- Inspect signal wiring: Check for loose terminals, damaged insulation, incorrect polarity, and cable routing that may introduce electrical interference.
- Configure the module: Confirm the order number, station position, channel assignments, and input parameters in the engineering project.
- Test each input channel: Operate the connected devices and verify that the corresponding input states change correctly in the PLC.
- Investigate diagnostic messages: Check the field supply, sensor wiring, input configuration, and connected device if an input remains inactive or a diagnostic fault appears.
- Record the final setup: Document channel assignments, input-delay settings, sensor connections, and commissioning results for future maintenance.
Compatible System Components
| Component | Function |
|---|---|
| Siemens 6ES7131-6BF01-0BA0 | Acquires eight standard 24 V DC digital input signals |
| SIMATIC ET 200SP BaseUnit, Type A0 | Provides module mounting and electrical connections |
| SIMATIC ET 200SP Interface Module | Connects the distributed I/O station to the controller network |
| SIMATIC S7-1200 PLC | Processes input data in compatible machine-control systems |
| SIMATIC S7-1500 PLC | Executes machine and process-control logic |
| 24 V DC Power Supply | Supplies the I/O station and compatible field devices as configured |
| PNP Proximity Sensors | Detect component presence and position |
| Photoelectric Sensors | Detect products and moving objects |
| Mechanical Limit Switches | Provide discrete travel and position feedback |
| Two-Wire Sensors | Supply input signals when their electrical characteristics are compatible |
| Terminal Blocks and Field Wiring | Connect field devices to the distributed I/O station |
| TIA Portal | Supports hardware configuration, parameter assignment, and diagnostics |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Siemens 6ES7131-6BF01-0BA0 | SIMATIC ET 200SP DI 8x 24 V DC ST | Standard eight-channel digital input acquisition |
| Siemens 6ES7131-6BF01-0AA0 | SIMATIC ET 200SP DI 8x 24 V DC BA | Basic digital input applications with a different feature set |
| Siemens 6ES7131-6BF00-0CA0 | SIMATIC ET 200SP DI 8x 24 V DC HF | Applications requiring High Feature functions and channel diagnostics |
| Siemens 6ES7131-6BF00-0DA0 | SIMATIC ET 200SP DI 8x 24 V DC HS | Applications requiring high-speed input modes, oversampling, or counter functions |
| Siemens 6ES7131-6BF01-2AA0 | SIMATIC ET 200SP DI 8x 24 V DC BA | Alternative packaging reference for the Basic input variant; verify the complete ordering code |
| Siemens 6ES7131-6BH01-0BA0 | SIMATIC ET 200SP DI 16x 24 V DC ST | Applications requiring a higher digital input channel count |
| Siemens 6ES7131-6TF00-0CA0 | SIMATIC ET 200SP Fail-Safe Digital Input Module | Safety-related input applications using an appropriate safety architecture |
| Siemens 6ES7131-6BF61-0AA0 | SIMATIC ET 200SP Digital Input Module | Comparing alternative input configurations for compatible field devices |
| Siemens 6ES7132-6BF00-0CA0 | SIMATIC ET 200SP Digital Output Module | Switching compatible digital output loads |
| Siemens 6ES7132-6BH01-0BA0 | SIMATIC ET 200SP DQ 16x 24 V DC/0.5 A ST | Applications requiring 16 digital output channels |
| Siemens 6ES7193-6BP00-0BA0 | SIMATIC ET 200SP BaseUnit | BaseUnit selection for compatible ET 200SP station configurations |
| Siemens 6ES7155 Series | SIMATIC ET 200SP Interface Modules | Connecting distributed I/O stations to the automation network |
| Siemens SIMATIC S7-1200 | PLC Family | Compact machine automation with distributed I/O |
| Siemens SIMATIC S7-1500 | PLC Family | Machine and process automation with modular I/O |
| Siemens SIMATIC ET 200SP | Distributed I/O System | Modular field-signal acquisition and output control |
Key Advantages
- Eight standard 24 V DC input channels in a modular ET 200SP station.
- Adjustable input delays for different sensor and switch characteristics.
- Integrated encoder supply with short-circuit protection.
- Diagnostic support for selected wiring and supply faults.
- Compatibility with Siemens distributed I/O and PLC architectures.
Technical FAQs
What distinguishes the 6ES7131-6BF01-0BA0 from the 6ES7131-6BF01-0AA0?
The 6ES7131-6BF01-0BA0 is the Standard variant, designated DI 8x 24 V DC ST, while the 6ES7131-6BF01-0AA0 is the Basic variant, designated DI 8x 24 V DC BA. Both provide eight digital inputs, but their feature sets and diagnostic capabilities should be checked against the specific application requirements.
Can the integrated encoder supply power to all eight connected sensors?
The module provides an integrated 24 V DC encoder supply with a maximum specified current of 700 mA per module. The combined demand of the connected sensors must remain within this limit, with wiring and protection arranged according to the installation requirements.
What should be considered when choosing an input delay?
The input delay should suppress unwanted short transitions without delaying valid machine signals beyond the acceptable response time. The correct value depends on the connected sensor, switching behavior, and control sequence.
Can this module be used for oversampling or dedicated counter functions?
No. The 6ES7131-6BF01-0BA0 supports standard DI operation but does not support oversampling or counter mode. Applications requiring these functions should be evaluated against a compatible High Speed input module.