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- Siemens
- 6ES7131-6FD01-0BB1
- Digital Input Module
- Germany
- 20 × 73 × 58 mm
- 0.048 kg
- Xiamen, China
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Product Overview
The Siemens 6ES7131-6FD01-0BB1 is a SIMATIC ET 200SP digital input module designated DI 4×120..230VAC ST. It provides four digital input channels for detecting AC switching signals in industrial automation systems. The module collects electrical states from compatible field devices and transfers the resulting input information through the ET 200SP station to the connected controller.
Unlike digital input modules intended for low-voltage DC sensors, this model is designed for 120–230 V AC input signals operating at 47–63 Hz. It is suitable for applications in which machine status signals, auxiliary contacts, or other compatible switching devices operate at these AC voltage levels. The connected circuit must meet the module’s electrical requirements, including its input characteristics and wiring configuration.
In a machine control cabinet, the module can monitor auxiliary equipment, AC-operated switching contacts, and discrete operating states from compatible devices. For example, an input may indicate that an auxiliary mechanism has reached a particular state, allowing the PLC to coordinate the next stage of a production sequence. The module acquires the signal; the controller determines how that information affects machine operation.
The 6ES7131-6FD01-0BB1 supports four standard digital inputs and is compatible with an ET 200SP BaseUnit of type B1. Its color code is CC41, and its inputs use the IEC 61131 Type 3 characteristic. Because the module operates at substantially higher input voltages than typical 24 V DC sensor modules, correct circuit separation, terminal assignment, and electrical safety procedures are particularly important during installation and servicing.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model / Article Number | 6ES7131-6FD01-0BB1 |
| Product Family | SIMATIC ET 200SP |
| Product Type | Digital Input Module |
| Module Designation | DI 4×120..230VAC ST |
| Number of Digital Inputs | 4 |
| Rated Input Voltage | 120/230 V AC |
| Permissible Input Frequency | 47–63 Hz |
| Input Characteristic | Type 3, IEC 61131 |
| Typical Input Current | 10.8 mA at signal state 1 |
| Input Delay | Parameterizable; 1.5–10 ms, depending on transition and setting |
| BaseUnit Compatibility | BU type B1 |
| Color Code | CC41 |
| Module Diagnostics | No module diagnostics |
| Counter Function | Not supported |
| Oversampling Function | Not supported |
| Typical Power Loss | 1 W under specified 230 V AC operating conditions |
| Engineering Software | STEP 7 / TIA Portal, or compatible GSD-based configuration |
| Dimensions | 20 × 73 × 58 mm |
| Weight | 0.048 kg |
Product Features
- Four AC digital input channels: Acquires discrete signals from compatible 120–230 V AC field circuits.
- Standard input configuration: Supports conventional digital signal acquisition rather than specialized counting or high-speed measurement.
- IEC 61131 Type 3 input characteristic: Defines the input behavior for compatible field-device circuits.
- BaseUnit type B1 compatibility: Integrates into the corresponding ET 200SP mounting and wiring arrangement.
- Channel status indication: Helps technicians observe input states during commissioning and troubleshooting.
- Configurable input delay: Allows supported filtering settings to be selected according to the application’s signal response requirements.
- Distributed I/O integration: Transfers field input states through the ET 200SP station to the automation controller.
- Multiple engineering options: Supports configuration through compatible Siemens engineering software and GSD-based environments.
Working Principle
The 6ES7131-6FD01-0BB1 detects the electrical state of each connected AC input circuit. When a compatible input signal meets the module’s switching conditions, the channel registers the corresponding state and makes that information available to the controller through the ET 200SP backplane bus.
A typical signal path follows this arrangement:
120–230 V AC Switching Device → Digital Input Channel → ET 200SP Backplane Bus → Interface Module → PLC Program
For example, an auxiliary contact in an AC-operated machine circuit may change state when a mechanism completes an operation. The module detects the resulting AC input condition, and the PLC uses the reported state to update the machine sequence or determine whether a subsequent action is permitted.
The input delay determines how the module responds to signal transitions. Selecting an appropriate delay can help prevent brief electrical disturbances from being interpreted as valid switching events. However, excessive filtering can delay recognition of a legitimate state change, so the parameter should be selected according to the switching device and required machine response.
The module is a standard digital input device rather than a counter or high-speed signal-processing module. It does not independently execute machine logic, drive actuators, or provide a substitute for external circuit protection. Those functions belong to the controller, output equipment, and appropriately designed electrical installation.
Role in the SIMATIC ET 200SP Control Architecture
The 6ES7131-6FD01-0BB1 occupies the field signal acquisition layer of a distributed control system. It receives compatible AC switching signals and transfers their states to the PLC, where they are evaluated alongside other input information.
AC Field Devices → 6ES7131-6FD01-0BB1 → ET 200SP Backplane → Interface Module → PLC
| System Component | Function |
|---|---|
| AC Switching Devices | Generate discrete signals representing equipment states |
| 6ES7131-6FD01-0BB1 | Acquires four compatible AC digital input signals |
| ET 200SP BaseUnit, Type B1 | 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 |
| STEP 7 / TIA Portal | Supports hardware configuration and input parameterization |
| Field Wiring | Carries AC signals from the connected devices to the input terminals |
| Electrical Protection Devices | Provide protection appropriate to the field circuits and installation |
| Machine Actuators | Execute control actions through suitable output and switching equipment |
Industrial Applications
| Application | Typical Use |
|---|---|
| Industrial Machine Control | Monitoring compatible AC-operated switching contacts |
| Manufacturing Equipment | Acquiring discrete operating-state signals |
| Conveyor Systems | Reading auxiliary contact states from compatible equipment |
| Packaging Machinery | Monitoring AC switching devices used in machine sequences |
| Material Handling | Detecting operating states from compatible mechanisms |
| Pumping Equipment | Acquiring discrete status signals from auxiliary circuits |
| Ventilation Systems | Monitoring compatible AC-operated equipment contacts |
| Industrial Utility Panels | Collecting AC input signals for centralized control |
| Production Line Interlocks | Providing input states for PLC-based sequence logic |
| Distributed Control Cabinets | Expanding AC signal acquisition within an ET 200SP station |
Installation and Maintenance
- Verify the complete article number: Confirm 6ES7131-6FD01-0BB1 and distinguish it from ET 200SP modules intended for 24 V DC or other input voltage ranges.
- Check the BaseUnit: Install the module on a compatible BU type B1 BaseUnit and verify the terminal arrangement against the station design.
- Confirm the AC supply characteristics: Check the field circuit voltage and frequency against the module’s specified input range before connecting any device.
- Review the electrical schematic: Identify each input channel, its associated switching contact, and the required return connections before wiring.
- Isolate the electrical circuit: Disconnect the relevant power sources and verify the absence of hazardous voltage before installing, removing, or rewiring the module.
- Maintain appropriate circuit separation: Route AC input conductors according to the panel design and applicable electrical safety requirements, keeping them separate from incompatible low-voltage circuits where required.
- Configure the input delay: Select a supported delay setting that meets the machine’s signal filtering and response-time requirements.
- Verify the engineering configuration: Confirm the correct module designation, station configuration, and input addresses in the selected STEP 7, TIA Portal, or GSD-based project.
- Check the channel indicators: During commissioning, compare the channel status LEDs with the actual switching states of the connected devices.
- Test each input independently: Operate the field devices and verify that each signal reaches the intended PLC address and produces the expected control response.
- Investigate abnormal input behavior: Check the field voltage, switching contact, wiring, BaseUnit terminals, channel assignment, and engineering configuration if an input remains inactive or changes unexpectedly.
- Record the final configuration: Document the connected circuits, input assignments, delay settings, BaseUnit reference, and commissioning results for future maintenance.
Compatible System Components
| Component | Function |
|---|---|
| Siemens ET 200SP BaseUnit, Type B1 | Provides the required module mounting and electrical connection interface |
| Siemens ET 200SP Interface Module | Connects the I/O station to the automation network |
| SIMATIC S7 PLC | Processes the digital input information |
| Compatible 120–230 V AC Switching Contacts | Supply the specified digital input signals |
| Auxiliary Contacts | Indicate operating or switching states |
| AC-Controlled Equipment | Provides compatible discrete status signals through suitable contacts |
| Circuit Protection Devices | Protect the relevant AC field circuits |
| Field Wiring and Terminal Accessories | Connect the field devices to the input channels |
| STEP 7 / TIA Portal | Supports configuration and commissioning |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Siemens 6ES7131-6FD01-0BB1 | DI 4×120..230VAC ST Digital Input Module | Four-channel, 120–230 V AC signal acquisition |
| Siemens 6ES7131-6CF00-0AU0 | DI 8x24VAC/48VUC BA Digital Input Module | Eight-channel, compatible low-voltage AC/DC signal acquisition |
| Siemens 6ES7131-6BH01-0BA0 | DI 16x24VDC ST Digital Input Module | Sixteen-channel, 24 V DC digital input acquisition |
| Siemens 6ES7131-6BF01-0BA0 | DI 8x24VDC ST Digital Input Module | Eight-channel, standard 24 V DC signal acquisition |
| Siemens 6ES7131-6BF00-0CA0 | DI 8x24VDC HF Digital Input Module | High-feature 24 V DC input applications |
| Siemens 6ES7131-6BF00-0DA0 | DI 8x24VDC HS Digital Input Module | High-speed 24 V DC digital input applications |
Key Advantages
- Acquires four discrete signals from compatible 120–230 V AC circuits.
- Supports standard digital input processing within the ET 200SP system.
- Provides configurable input delay for supported signal filtering.
- Integrates with compatible BaseUnit type B1 configurations.
- Supports centralized PLC monitoring of AC-operated field devices.
Technical FAQs
What type of field device can be connected to the 6ES7131-6FD01-0BB1?
The module is intended for compatible 120–230 V AC switching signals. Confirm the device’s output arrangement, operating voltage, frequency, and switching characteristics before connecting it to an input channel.
Does the 6ES7131-6FD01-0BB1 provide module-level diagnostic functions?
No module diagnostics are specified for this standard variant. Troubleshooting should therefore include checking the field circuit, channel status indication, wiring, BaseUnit connections, and the PLC configuration rather than relying on dedicated module diagnostic alarms.
Why is BaseUnit type B1 important when installing this module?
The B1 BaseUnit provides the compatible mounting and electrical connection arrangement for the module. An incorrect BaseUnit can prevent the intended station configuration or terminal wiring from being implemented correctly.
Can this module directly monitor high-speed pulses from an encoder?
It is a standard digital input module and does not support a counter function. Applications requiring high-speed pulse counting, encoder evaluation, or precise event measurement should use a module specifically intended for those functions.