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- Siemens
- 6ES7131-6BH01-0BA0
- Digital Input Module
- Germany
- 15 × 73 × 58 mm
- 0.035 kg
- Xiamen, China
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Product Overview
The Siemens 6ES7131-6BH01-0BA0 is a SIMATIC ET 200SP digital input module with 16 digital inputs for 24 V DC signals. It is used in distributed automation systems to collect discrete signals from field devices and transfer their states to a PLC or higher-level controller through the ET 200SP station’s backplane communication system.
In a typical production line, the module can collect signals from proximity switches, limit switches, pushbuttons, and other compatible digital sensors. These signals allow the controller to determine whether a component is present, a mechanism has reached its end position, or an operating condition has changed. By locating the input module near the field devices, the control cabinet and field wiring can be organized around the machine layout.
The 6ES7131-6BH01-0BA0 is the standard DI 16x24VDC ST version. It supports sink-type input evaluation for compatible PNP sensor signals and is designed for use with an ET 200SP BaseUnit of type A0. The module also supports wire-break and supply-voltage diagnostics, helping maintenance personnel identify certain wiring or supply-related problems without relying exclusively on external measurements.
This module is intended for discrete signal acquisition rather than analog measurement or direct motor control. Its suitability depends on the field signal characteristics, input delay requirements, BaseUnit configuration, and the communication setup of the overall ET 200SP station.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model / Article Number | 6ES7131-6BH01-0BA0 |
| Product Family | SIMATIC ET 200SP |
| Product Type | Digital Input Module |
| Module Designation | DI 16x24VDC ST |
| Number of Digital Inputs | 16 |
| Rated Input Voltage | 24 V DC |
| Input Type | Type 3, IEC 61131 |
| Input Configuration | Sink input, compatible with PNP signal evaluation |
| Input Delay Time | 0.05–20 ms |
| BaseUnit Compatibility | BU type A0 |
| Color Code | CC00 |
| Wire-Break Diagnostics | Supported |
| Supply-Voltage Diagnostics | Supported |
| Short-Circuit Diagnostics | Not supported |
| Potential Isolation | Between input channels and backplane bus |
| Maximum Current Consumption | 90 mA |
| Typical Power Loss | 1.7 W |
| Configuration Software | STEP 7 / TIA Portal |
| Dimensions | 15 × 73 × 58 mm |
| Weight | 0.035 kg |
Product Features
- 16 digital input channels: Collects discrete 24 V DC signals from compatible field devices.
- Standard ET 200SP design: Integrates into distributed I/O stations used with Siemens automation controllers.
- PNP signal compatibility: Supports the specified sink-input arrangement for compatible field sensors.
- Adjustable input delay: Provides configurable input filtering within the supported range to suit different signal conditions.
- Diagnostic functions: Supports wire-break and supply-voltage diagnostics for fault identification.
- BaseUnit type A0 compatibility: Requires the appropriate BaseUnit for mechanical and electrical integration.
- TIA Portal integration: Supports configuration and engineering through compatible Siemens automation software.
- Status indication: Uses module and channel LEDs to assist with local commissioning and troubleshooting.
Working Principle
The 6ES7131-6BH01-0BA0 converts the electrical states of connected 24 V DC field signals into digital input information for the automation controller. Each channel detects whether its input signal meets the configured switching conditions and makes the resulting state available through the ET 200SP station.
A typical signal path follows this arrangement:
Field Sensor or Switch → Digital Input Channel → ET 200SP Backplane Bus → Interface Module → PLC Program
For example, a PNP proximity sensor may switch its output to a positive supply potential when a target enters its detection range. The input channel evaluates the signal and communicates the corresponding state to the controller. The PLC program can then use that information to enable a conveyor step, confirm a machine position, or update an interlock condition.
The configurable input delay helps filter brief signal changes that should not be interpreted as valid switching events. The appropriate setting depends on the response time required by the machine and the characteristics of the connected devices. Excessive filtering can delay signal recognition, while insufficient filtering may allow unwanted transitions to reach the control program.
The module also supports diagnostic functions for wire-break conditions and supply-voltage monitoring. These functions can help identify wiring faults, but they do not replace appropriate field-device design or wiring checks. Short-circuit diagnostics are not supported by this module.
Role in the SIMATIC ET 200SP Control Architecture
The 6ES7131-6BH01-0BA0 occupies the digital signal acquisition layer of a distributed automation system. It receives field signals and passes their states through the ET 200SP station to the controller, which executes the machine logic.
Field Devices → 6ES7131-6BH01-0BA0 → ET 200SP Backplane → Interface Module → PLC
| System Component | Function |
|---|---|
| Field Sensors and Switches | Generate discrete signals representing machine states |
| 6ES7131-6BH01-0BA0 | Acquires 16 digital input signals |
| ET 200SP BaseUnit, Type A0 | Provides the required mounting and electrical connection arrangement |
| ET 200SP Interface Module | Connects the distributed I/O station to the control network |
| SIMATIC PLC | Processes input states and executes control logic |
| TIA Portal | Supports hardware configuration, parameterization, and diagnostics |
| Field Wiring | Carries signals from sensors and switches to the input channels |
| Machine Actuators | Respond to controller outputs rather than being driven directly by the input module |
Industrial Applications
| Application | Typical Use |
|---|---|
| Conveyor Systems | Detecting product presence and position-switch states |
| Packaging Machinery | Monitoring guards, limit switches, and product sensors |
| Assembly Lines | Confirming fixture positions and component presence |
| Material Handling | Acquiring signals from transfer and positioning mechanisms |
| Machine Tools | Collecting discrete operating and limit-switch signals |
| Automated Warehousing | Monitoring equipment positions and sensor states |
| Process Equipment | Reading compatible binary status signals from field devices |
| Automotive Manufacturing | Monitoring machine stations and component detection points |
| Production Cell Control | Providing local digital inputs in a distributed I/O arrangement |
| Industrial Equipment Retrofits | Expanding discrete signal acquisition within a compatible ET 200SP station |
Installation and Maintenance
- Verify the complete order number: Confirm 6ES7131-6BH01-0BA0 and distinguish it from other ET 200SP input modules with different channel counts or electrical characteristics.
- Check the BaseUnit: Use a compatible BU type A0 BaseUnit and confirm the station arrangement before mounting the module.
- Confirm the field-device type: Verify that the connected sensors and switches provide signal levels compatible with the module’s 24 V DC input configuration.
- Check the wiring arrangement: Confirm the sensor supply, signal conductor, and common connections against the intended sink-input circuit.
- Isolate the station before installation: Follow the applicable electrical safety procedure before inserting, removing, or rewiring the module.
- Configure the input delay: Select an appropriate delay setting based on the signal characteristics and machine response requirements.
- Enable relevant diagnostics: Configure supported wire-break and supply-voltage monitoring where the application requires these functions.
- Verify the engineering configuration: Confirm the module designation and hardware configuration in the selected STEP 7 or TIA Portal project.
- Check channel indicators: During commissioning, compare the channel LEDs with the actual switching states of the connected field devices.
- Test the complete signal path: Verify that each input state reaches the correct PLC address and triggers the intended program response.
- Investigate abnormal signals: Check field wiring, sensor output, supply voltage, channel assignment, and diagnostic messages if an input remains inactive or switches intermittently.
- Record the final configuration: Document channel assignments, input delays, diagnostic settings, and the associated BaseUnit for future maintenance.
Compatible System Components
| Component | Function |
|---|---|
| Siemens ET 200SP BaseUnit, Type A0 | Provides the required mounting and electrical connection interface |
| Siemens ET 200SP Interface Module | Connects the I/O station to the automation network |
| SIMATIC S7 PLC | Processes digital input information |
| 24 V DC Power Supply | Supplies compatible field devices and associated circuits |
| PNP Proximity Sensors | Provide discrete switching signals |
| Limit Switches | Indicate mechanical end positions |
| Pushbuttons and Selector Switches | Provide operator commands and mode selections |
| Field Wiring and Terminal Accessories | Connect field signals to the input channels |
| STEP 7 / TIA Portal | Supports module configuration and diagnostics |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Siemens 6ES7131-6BH01-0BA0 | DI 16x24VDC ST Digital Input Module | Standard 16-channel, 24 V DC digital input acquisition |
| Siemens 6ES7131-6BF00-0CA0 | ET 200SP Digital Input Module | Lower-channel-count digital input applications |
| Siemens 6ES7131-6BF00-0DA0 | ET 200SP Digital Input Module | Compatible ET 200SP discrete signal acquisition |
| Siemens 6ES7131-6BF01-0AA0 | ET 200SP Digital Input Module | Alternative digital input configuration |
| Siemens 6ES7131-6BF01-0BA0 | ET 200SP Digital Input Module | Discrete signal acquisition for compatible ET 200SP stations |
| Siemens 6ES7131-6BF61-0AA0 | ET 200SP Digital Input Module | Alternative input module for compatible distributed I/O systems |
Key Advantages
- Acquires 16 discrete 24 V DC signals in a distributed I/O station.
- Supports configurable input delay for different signal conditions.
- Provides wire-break and supply-voltage diagnostic functions.
- Integrates with the ET 200SP system and compatible SIMATIC engineering tools.
- Helps organize field signal acquisition close to the machinery being controlled.
Technical FAQs
Which BaseUnit is required for the 6ES7131-6BH01-0BA0?
The specified compatible BaseUnit type is A0. Confirm the exact BaseUnit variant and terminal arrangement against the station design before installation.
How should the input delay be selected for connected sensors?
Choose a setting within the supported 0.05–20 ms range based on the field signal and the response time required by the control sequence. Test the selected setting during commissioning to ensure that valid transitions are detected without introducing excessive delay.
Does this module provide short-circuit diagnostics for every input channel?
No. Short-circuit diagnostics are not supported. The wiring design, field-device protection, and troubleshooting procedure should account for this limitation.
What should be checked if the channel LED changes state but the PLC program does not respond?
Check the hardware configuration, assigned input address, field-device wiring, and PLC logic conditions. Also verify that the configured module matches the installed hardware and that the program is reading the intended channel.