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- Siemens
- 6ES7131-4BF00-0AA0
- Digital Input Electronic Module
- Germany
- 15 × 81 × 52 mm
- 0.042 kg
- Xiamen, China
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Product Overview
The Siemens 6ES7131-4BF00-0AA0 is an eight-channel digital input electronic module for the SIMATIC ET 200S distributed I/O system. It accepts 24 V DC signals from industrial sensors and switches, allowing multiple field conditions to be monitored through a single module within a decentralized control station.
This module is well suited to machines where several discrete signals originate from the same operating area. On a conveyor line, for example, eight inputs can be assigned to workpiece detection, stopper positions, guard-status switches, cylinder end-position sensors, and other machine feedback signals. Collecting these signals locally simplifies the field wiring arrangement and keeps the input data available to the PLC through the ET 200S station.
The 6ES7131-4BF00-0AA0 uses standard digital input processing with a typical input delay of 3 ms. Its response is suitable for conventional machine-status monitoring and sequence control, although applications involving very short pulses or high-speed counting require careful assessment of signal duration and controller timing.
Each input has an individual green status LED, which is useful when commissioning a machine or tracing a signal that does not match the expected sequence. The module also supports compatible two-wire sensors and isochronous operation in suitable system configurations. However, it does not provide built-in diagnostic functions, so electrical faults generally need to be investigated through sensor checks, wiring inspection, controller logic, or other system-level monitoring.
Within an ET 200S station, the electronic module is mounted with a compatible terminal module and communicates through the station’s backplane bus. Its eight-channel configuration makes it a practical option when multiple 24 V DC signals need to be collected in a limited number of distributed I/O positions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES7131-4BF00-0AA0 |
| Product Family | SIMATIC ET 200S |
| Product Type | Digital Input Electronic Module |
| Module Designation | 8DI DC24V |
| Number of Digital Inputs | 8 |
| Rated Input Voltage | 24 V DC |
| Input Signal Type | DC digital signals |
| Signal Level for Logic 0 | -30 to +5 V DC |
| Signal Level for Logic 1 | +15 to +30 V DC |
| Typical Input Current | 7 mA at 24 V DC |
| Typical Input Delay | 3 ms |
| Input Delay Range | 2–4.5 ms |
| Input Delay Parameterization | Not supported |
| Input Characteristic | IEC 61131, Type 1 |
| Channel Status Indicators | Green LED per input |
| Diagnostic Function | Not supported |
| Hardware Interrupts | Not supported |
| Two-Wire Sensor Compatibility | Supported |
| Maximum Two-Wire Sensor Leakage Current | 1.5 mA |
| Rated Supply Voltage | 24 V DC from the power module |
| Reverse Polarity Protection | Supported |
| Backplane Bus Current Consumption | 10 mA maximum at 3.3 V DC |
| Typical Power Dissipation | 1.2 W |
| Potential Isolation | Inputs isolated from the backplane bus; channels are not isolated from each other |
| Isochronous Operation | Supported |
| Maximum Cable Length, Unshielded | 600 m |
| Maximum Cable Length, Shielded | 1,000 m |
| Dimensions | 15 × 81 × 52 mm |
| Weight | 0.042 kg |
Product Features
- Eight digital input channels: Collects eight independent binary signals through one electronic module.
- 24 V DC input interface: Supports standard industrial sensors and switching devices.
- Standard input response: Uses a typical 3 ms input delay, with a specified range of 2–4.5 ms.
- Individual channel LEDs: Green indicators help technicians identify the current state of each input.
- Two-wire sensor compatibility: Supports suitable two-wire sensors within the specified leakage-current limit.
- Isochronous operation support: Can be used in compatible synchronized ET 200S configurations.
- Backplane bus isolation: Provides electrical isolation between the input circuits and the station backplane bus.
- Reverse polarity protection: Protects the module against specified reverse-polarity conditions.
- Modular distributed I/O integration: Collects field signals close to the machine rather than requiring every sensor cable to run directly to the central PLC cabinet.
Working Principle
The 6ES7131-4BF00-0AA0 reads the electrical states of eight field inputs and makes the resulting binary data available to the controller through the ET 200S station. It does not determine machine actions itself; the PLC program interprets the input states and decides when to advance a sequence, stop an operation, or activate an output.
A typical signal path is:
Field Sensors and Switches → 6ES7131-4BF00-0AA0 → ET 200S Backplane Bus → Interface Module → PLC
When a connected sensor activates, its output voltage enters the module’s logic-1 range of +15 to +30 V DC. A voltage between -30 and +5 V DC is recognized as logic 0. The module processes the transition with a typical input delay of 3 ms, within the specified 2–4.5 ms range.
For example, a material-handling machine may use separate sensors to detect a pallet at the loading position, confirm a pneumatic stopper has extended, monitor a guard switch, and verify that a transfer cylinder has returned. These signals can be distributed across the eight input channels. The PLC then checks the relevant combination of states before allowing the next operation.
The input delay is fixed rather than parameterizable on this standard module. This matters when a machine relies on very short switching events: the signal must last long enough to be recognized within the module’s response characteristics and the overall controller cycle. If the application requires configurable filtering or specialized high-speed event handling, a different input module may be more appropriate.
During commissioning, the green LEDs provide a quick way to observe whether a channel changes state when its field device is operated. Because the module does not provide built-in diagnostic reporting, an input that fails to respond should be investigated by checking the sensor supply, output voltage, wiring, terminal assignment, and PLC input mapping.
Role in a SIMATIC ET 200S Distributed I/O Architecture
The 6ES7131-4BF00-0AA0 serves as a local acquisition point for eight digital field signals. By grouping sensors within the same machine area, it helps organize wiring and transfers input states to the PLC through the ET 200S station architecture.
Field Devices → 8DI DC24V Module → ET 200S Backplane Bus → Interface Module → PLC
| System Element | Function |
|---|---|
| 6ES7131-4BF00-0AA0 | Acquires eight 24 V DC digital input signals |
| Compatible ET 200S Terminal Module | Provides the electrical connection and mounting interface |
| ET 200S Backplane Bus | Transfers input data within the station |
| ET 200S Interface Module | Connects the distributed I/O station to the control network |
| SIMATIC PLC | Processes input states and executes machine logic |
| 24 V DC Power Supply | Supplies compatible field sensors and control circuits |
| Proximity Sensors | Detect workpiece presence and position |
| Limit Switches | Report mechanical end positions and equipment states |
| Operator Switches | Supply manual commands or discrete operating selections |
The module’s eight inputs are useful for grouping signals from one machine section. The final channel allocation depends on the available terminal connections, sensor wiring, PLC address mapping, and the requirements of the control program.
Industrial Applications
| Application | Typical Use |
|---|---|
| Conveyor Systems | Monitoring workpiece arrival, transfer positions, and stopper states |
| Packaging Machinery | Reading product-detection sensors and machine-position switches |
| Automated Assembly | Confirming component presence and fixture positions |
| Material Handling | Collecting pallet, guide, and transfer-mechanism feedback |
| Pneumatic Equipment | Monitoring cylinder end positions and mechanical interlocks |
| Machine Tools | Acquiring auxiliary status and limit-switch signals |
| Automated Warehousing | Monitoring discrete states at transfer and handling stations |
| Inspection Equipment | Reading part-present and fixture-occupied signals |
| Production Cells | Consolidating multiple field inputs in a distributed I/O station |
| General Factory Automation | Providing standard binary feedback for PLC sequence control |
Installation and Maintenance
- Verify the module reference: Confirm the complete article number 6ES7131-4BF00-0AA0 and the 8DI DC24V designation before installation or replacement.
- Check terminal-module compatibility: Use a compatible ET 200S terminal module and confirm that its connection arrangement supports the intended field wiring.
- Confirm the 24 V DC supply: Check the supply voltage and polarity for the connected sensors and associated field circuits.
- Inspect sensor output characteristics: Verify that each connected sensor produces a signal within the module’s specified logic-0 and logic-1 voltage ranges.
- Check two-wire sensor leakage current: For two-wire sensors, confirm that the off-state leakage current does not exceed the specified 1.5 mA limit.
- Assign the eight input channels: Map each sensor or switch to the correct input terminal and record its corresponding PLC address.
- Observe the channel LEDs: Operate each field device and check that the relevant green indicator changes state as expected.
- Account for the fixed input delay: Remember that the module’s typical input delay is 3 ms and cannot be parameterized. Check this behavior when diagnosing missed or short-duration signals.
- Inspect wiring and terminals: Look for loose connections, damaged conductors, incorrect polarity, or poor contact at the terminal module.
- Verify the PLC hardware configuration: Confirm that the module is correctly represented in the station configuration and that the program reads the intended input addresses.
- Troubleshoot without relying on module diagnostics: Since the module does not support built-in diagnostic functions, check the field sensor, power supply, wiring, terminal connections, and PLC logic systematically.
- Document changes after servicing: Record replaced components, input assignments, wiring corrections, and functional test results to simplify future maintenance.
Compatible System Components
| Component | Function |
|---|---|
| Siemens SIMATIC ET 200S Terminal Module | Provides the electrical connection and mounting interface |
| Siemens ET 200S Interface Module | Connects the distributed I/O station to the control network |
| Siemens SIMATIC S7 PLC | Processes digital input states and executes machine logic |
| 24 V DC Power Supply | Supplies compatible field sensors |
| Two-Wire Proximity Sensor | Provides a discrete switching signal within the specified electrical limits |
| Three-Wire Proximity Sensor | Detects the presence or position of a target |
| Limit Switch | Reports mechanical position or end-of-travel status |
| Pushbutton or Selector Switch | Provides manual commands to the PLC |
| ET 200S Backplane Bus | Transfers input data between the electronic module and interface module |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Siemens 6ES7131-4BF50-0AA0 | SIMATIC ET 200S Digital Input Electronic Module, 8DI Source Input 24 V DC | Eight-channel digital input applications requiring the specified source-input arrangement |
| Siemens 6ES7131-4BD01-0AA0 | SIMATIC ET 200S Digital Input Electronic Module, 4DI DC24V ST | Four-channel standard digital input acquisition |
| Siemens 6ES7131-4BD01-0AB0 | SIMATIC ET 200S Digital Input Electronic Module, 4DI DC24V HF | Four-channel input applications requiring configurable delays and additional diagnostic functions |
| Siemens 6ES7131-4BB01-0AA0 | SIMATIC ET 200S Digital Input Electronic Module, 2DI DC24V ST | Applications requiring two standard 24 V DC input channels |
| Siemens 6ES7132 Series | SIMATIC ET 200S Digital Output Electronic Modules | Switching compatible actuators and discrete output loads |
Key Advantages
- Eight 24 V DC digital inputs for collecting multiple field signals.
- Individual green LEDs for checking channel states during commissioning.
- Compatibility with suitable two-wire sensors and standard industrial switches.
- Isochronous operation support in compatible system configurations.
- Modular integration into an ET 200S distributed I/O station.
Technical FAQs
How many independent field signals can the 6ES7131-4BF00-0AA0 acquire?
The module has eight digital input channels. Each channel can be assigned to a compatible discrete sensor or switching device, subject to the wiring arrangement and available connections on the selected terminal module.
Can the input delay be adjusted for different sensor types?
No. The 6ES7131-4BF00-0AA0 uses a standard input delay that is not parameterizable. Its typical delay is 3 ms, with a specified range of 2–4.5 ms. Applications requiring selectable input delays should use a suitable module variant that supports this function.
Does the module provide a diagnostic alarm when a sensor wire is disconnected?
The module does not support built-in diagnostic functions. A disconnected wire or failed sensor may therefore need to be identified through PLC application logic, external monitoring, or electrical testing rather than a dedicated module diagnostic alarm.
What should be considered when connecting two-wire proximity sensors?
Check the sensor’s operating voltage, output behavior, and off-state leakage current. The permitted leakage current is up to 1.5 mA. The sensor must also produce a voltage that meets the module’s logic thresholds so that the input can distinguish the active and inactive states correctly.