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- Siemens
- 6ES7131-6CF00-0AU0
- Digital Input Module
- Germany
- 20 × 73 × 58 mm
- 0.044 kg
- Xiamen, China
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Product Overview
The Siemens 6ES7131-6CF00-0AU0 is a SIMATIC ET 200SP digital input module designated DI 8x24VAC/48VUC BA. It provides eight digital input channels for acquiring AC and DC switching signals from compatible field devices. As part of a distributed I/O station, it transfers the detected signal states to the connected controller for processing by the machine or plant control program.
Unlike standard 24 V DC digital input modules, this Basic module supports a wider range of input signal types, including 24 V AC and 48 V UC applications. This makes it suitable for installations where compatible field signals use different voltage arrangements. The actual input circuit must be checked against the module’s specified signal thresholds and electrical limits before connecting a device.
In a machine control panel, the module can collect signals from switches, compatible two-wire sensors, and other discrete field devices. For example, it can monitor a machine position switch or receive a status signal from an auxiliary mechanism. The PLC then uses the acquired state to determine whether the next operating step can proceed.
The 6ES7131-6CF00-0AU0 supports module diagnostics and uses a replaceable fuse for its sensor supply arrangement. It is intended for installation on a compatible ET 200SP BaseUnit of type U0, with color code CC20. These configuration details are important when expanding an existing station or replacing a module because input voltage capability, BaseUnit compatibility, and wiring arrangements differ across ET 200SP variants.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model / Article Number | 6ES7131-6CF00-0AU0 |
| Product Family | SIMATIC ET 200SP |
| Product Type | Digital Input Module |
| Module Designation | DI 8x24VAC/48VUC BA |
| Number of Digital Inputs | 8 |
| Rated Input Voltage | 24 V AC / 48 V UC |
| Input Type | Digital, IEC 61131 Type 1 |
| Supported Sensor Type | Compatible switches and two-wire sensors |
| BaseUnit Compatibility | BU type U0 |
| Color Code | CC20 |
| Module Diagnostics | Supported |
| Supply-Voltage Monitoring | Supported |
| Channel Status Indication | Supported |
| Replaceable Fuse | 5 × 20 mm, 2 A, 250 V, quick-acting |
| Maximum Current Consumption | 70 mA without sensor supply |
| Engineering Software | STEP 7 / TIA Portal, or GSD-based configuration as applicable |
| Dimensions | 20 × 73 × 58 mm |
| Weight | 0.044 kg |
Product Features
- Eight digital input channels: Acquires discrete switching signals from compatible field devices.
- AC and DC signal compatibility: Supports the specified 24 V AC and 48 V UC input applications.
- Basic module configuration: Provides digital signal acquisition within the SIMATIC ET 200SP distributed I/O system.
- Type U0 BaseUnit compatibility: Requires the appropriate BaseUnit for electrical connections and station integration.
- Module diagnostics: Helps identify supported module and supply-related faults during commissioning and operation.
- Channel status LEDs: Allow technicians to compare input indications with actual field-device states.
- Replaceable fuse arrangement: Supports servicing of the designated sensor supply circuit.
- TIA Portal and GSD engineering: Supports integration into compatible Siemens automation configurations.
Working Principle
The 6ES7131-6CF00-0AU0 detects discrete electrical signals connected to its eight input channels. Each channel evaluates the applied signal against the module’s input characteristics and communicates the resulting state through the ET 200SP station’s backplane bus.
A typical signal path follows this arrangement:
Field Switch or Sensor → Digital Input Channel → ET 200SP Backplane Bus → Interface Module → PLC Program
For example, a compatible position switch may change its output state when a machine mechanism reaches a defined position. The input module detects the electrical transition, and the controller receives the corresponding digital information. The PLC program can then permit the next machine sequence, register a completed operation, or update a status indication.
The module’s AC/DC input capability makes it different from digital input variants intended exclusively for 24 V DC signals. However, compatibility must be assessed using the actual input voltage, signal thresholds, wiring configuration, and connected device characteristics. A device should not be connected merely because its nominal voltage appears to fall within a broad range.
The module also provides diagnostic information and supply-voltage monitoring. Its status indicators help maintenance personnel distinguish certain module or supply issues from field-device problems. The replaceable fuse must be serviced according to the prescribed procedure, with the station isolated as required.
Role in the SIMATIC ET 200SP Control Architecture
The 6ES7131-6CF00-0AU0 occupies the discrete signal acquisition layer of a distributed automation system. It reads compatible field signals and makes their states available to the PLC through the ET 200SP station.
Field Devices → 6ES7131-6CF00-0AU0 → ET 200SP Backplane → Interface Module → PLC
| System Component | Function |
|---|---|
| Field Switches and Sensors | Generate discrete signals representing machine or process states |
| 6ES7131-6CF00-0AU0 | Acquires eight compatible AC/DC digital input signals |
| ET 200SP BaseUnit, Type U0 | 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 the input states and executes the control logic |
| STEP 7 / TIA Portal | Supports hardware configuration, engineering, and diagnostics |
| Field Wiring | Carries signals from field devices to the input terminals |
| Machine Actuators | Execute control actions commanded by the PLC through suitable output devices |
Industrial Applications
| Application | Typical Use |
|---|---|
| Industrial Machine Control | Acquiring discrete status signals from switches and sensors |
| Conveyor Systems | Monitoring position switches and transfer mechanisms |
| Packaging Machinery | Detecting machine positions and auxiliary equipment states |
| Assembly Lines | Confirming fixture positions and component presence |
| Material Handling | Reading discrete signals from handling and transfer equipment |
| Production Equipment | Collecting compatible AC/DC switching signals |
| Industrial Utility Systems | Monitoring auxiliary devices and equipment status |
| Automated Workstations | Providing local digital inputs within a distributed I/O station |
| Equipment Modernization | Expanding signal acquisition in compatible ET 200SP installations |
| Centralized Machine Control Panels | Transferring field states to a SIMATIC PLC for sequence control |
Installation and Maintenance
- Verify the complete article number: Confirm 6ES7131-6CF00-0AU0 and distinguish it from ET 200SP modules intended for different input voltages or channel configurations.
- Check the BaseUnit: Use a compatible BU type U0 BaseUnit and verify its terminal arrangement against the station design.
- Confirm the field signal voltage: Check whether each connected device uses the intended 24 V AC or 48 V UC input arrangement.
- Review the input circuit: Verify signal thresholds, conductor assignments, common connections, and sensor compatibility before wiring.
- Isolate the station: Follow the applicable electrical safety procedure before installing, removing, or rewiring the module.
- Check the fuse arrangement: Confirm the specified fuse type and rating when inspecting or servicing the sensor supply circuit.
- Configure the hardware: Select the correct module designation in STEP 7, TIA Portal, or the applicable GSD-based engineering environment.
- Verify station addressing: Confirm that the input addresses assigned in the PLC project correspond to the installed module and intended channels.
- Check diagnostic indicators: During commissioning, review the module LEDs and available diagnostic messages for supply or configuration problems.
- Test each input channel: Operate the connected field devices individually and confirm that the corresponding input state is detected by the controller.
- Investigate abnormal signals: Check the field-device output, supply voltage, fuse condition, wiring, BaseUnit connections, and engineering configuration if an input behaves unexpectedly.
- Record the final configuration: Document the channel assignments, connected signal types, BaseUnit reference, fuse specification, and relevant diagnostic settings.
Compatible System Components
| Component | Function |
|---|---|
| Siemens ET 200SP BaseUnit, Type U0 | 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 |
| Compatible 24 V AC Field Devices | Provide supported AC switching signals |
| Compatible 48 V UC Field Devices | Provide supported universal-current switching signals |
| Two-Wire Sensors | Supply compatible discrete input signals |
| Industrial Switches | Indicate equipment positions or operating states |
| 5 × 20 mm Fuse, Specified Rating | Protects the designated fused circuit |
| Field Wiring and Terminal Accessories | Connect field devices to the module |
| STEP 7 / TIA Portal | Supports configuration and troubleshooting |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Siemens 6ES7131-6CF00-0AU0 | DI 8x24VAC/48VUC BA Digital Input Module | Eight-channel AC/DC digital signal acquisition |
| Siemens 6ES7131-6BH01-0BA0 | DI 16x24VDC ST Digital Input Module | Sixteen-channel, 24 V DC signal acquisition |
| Siemens 6ES7131-6BF00-0CA0 | ET 200SP Digital Input Module | Discrete input acquisition for compatible ET 200SP stations |
| Siemens 6ES7131-6BF00-0DA0 | ET 200SP Digital Input Module | Alternative digital input configuration |
| Siemens 6ES7131-6BF01-0AA0 | ET 200SP Digital Input Module | Digital input applications requiring a compatible module variant |
| Siemens 6ES7131-6BF01-0BA0 | ET 200SP Digital Input Module | Discrete signal acquisition in compatible distributed I/O systems |
Key Advantages
- Acquires eight digital signals using the specified AC/DC input configuration.
- Supports compatible field devices with different signal-voltage arrangements.
- Provides module diagnostics and supply-voltage monitoring.
- Includes a replaceable fuse for the designated sensor supply arrangement.
- Integrates into compatible SIMATIC ET 200SP distributed I/O stations.
- Supports engineering through Siemens automation software and applicable GSD configurations.
Technical FAQs
What distinguishes the 6ES7131-6CF00-0AU0 from a standard 24 V DC input module?
This module is designated DI 8x24VAC/48VUC BA and supports specified AC/DC input applications. A standard 24 V DC input module has different electrical input characteristics, so the connected field-device voltage and signal requirements must be checked before selecting a replacement.
Which BaseUnit should be used with this module?
The specified BaseUnit compatibility is BU type U0. Verify the installed BaseUnit and terminal arrangement before adding the module to an existing ET 200SP station.
What should be checked if the module reports a supply-related diagnostic?
Check the applicable supply voltage, wiring connections, sensor supply circuit, and replaceable fuse where relevant. Review the diagnostic information to identify the affected circuit before replacing the module.
Can this module be used for high-speed pulse counting?
It is a basic digital input module rather than a dedicated high-speed counter module. If the application requires high-frequency pulse measurement or hardware counting, select a module specifically rated for that function and verify its compatibility with the control system.