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- Siemens
- 6ES7131-4FB00-0AB0
- Digital Input Electronic Module
- Germany
- 15 × 81 × 52 mm
- 0.174 kg
- Xiamen, China
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Product Overview
The Siemens 6ES7131-4FB00-0AB0 is a two-channel digital input electronic module in the SIMATIC ET 200S distributed I/O system. Identified as 2DI AC230V ST, it reads discrete signals from 230 V AC circuits and transfers their states to the controller through the ET 200S backplane bus.
This module suits installations where switching signals are available at 230 V AC, such as auxiliary contacts and limit switches in industrial electrical equipment. It allows these signals to enter a PLC-based control system through a distributed I/O station, without requiring a separate interface for every compatible field contact.
Consider a machine cabinet that monitors the operating state of an AC-powered device. One input can receive a status contact from the equipment, while the other monitors a separate switching condition. The PLC then uses these states in its sequence logic, alarms, or equipment interlocks. Green LEDs on the module help technicians check the detected state of each input during commissioning and fault tracing.
The module is intended for conventional discrete signal acquisition rather than high-speed pulse measurement. Its input response time must be considered when evaluating short switching events, and its 230 V AC input specification means it cannot be treated as a direct replacement for a standard 24 V DC input module.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model / Article Number | 6ES7131-4FB00-0AB0 |
| Product Family | SIMATIC ET 200S |
| Product Type | Digital Input Electronic Module |
| Module Designation | 2DI AC230V ST |
| Number of Digital Inputs | 2 |
| Rated Input Voltage | 230 V AC |
| Input Frequency | 47–63 Hz |
| Signal 1 Input Voltage | 164–264 V AC |
| Signal 0 Input Voltage | 0–40 V AC |
| Input Current at Signal 1 | 5–15 mA |
| Input Delay, Signal 0 to 1 | 15 ms |
| Input Delay, Signal 1 to 0 | 45 ms |
| Input Characteristic | IEC 61131 Type 1 |
| Channel Status Indicators | Green LED per channel |
| Diagnostics Function | No |
| Electrical Isolation | Between input channels and backplane bus |
| Power Dissipation | Typically 0.7 W |
| Dimensions | 15 × 81 × 52 mm |
| Weight | 0.174 kg |
Product Features
- Two 230 V AC input channels: Monitors two discrete signals from compatible AC switching circuits.
- Defined switching thresholds: Distinguishes valid ON and OFF states within the specified input-voltage ranges.
- Individual status indication: Green LEDs display the detected state of each channel.
- Electrical isolation: Separates the input circuits from the ET 200S backplane bus.
- Distributed I/O integration: Transfers field signal states to the connected automation controller.
- Standard input response: Supports conventional machine-status monitoring and sequence-control applications.
Working Principle
The 6ES7131-4FB00-0AB0 monitors the AC voltage applied to each input channel. Its input electronics evaluate the signal against the module’s switching thresholds and convert the detected condition into digital input data for the controller.
For a nominal 230 V AC circuit, the specified signal 1 range is 164–264 V AC, while 0–40 V AC corresponds to signal 0. These ranges are important when troubleshooting a field contact that appears to operate correctly but does not produce the expected PLC input state. A voltage between the two specified ranges should not be assumed to represent a guaranteed ON or OFF condition.
The signal path is straightforward:
AC Field Contact → Digital Input Channel → ET 200S Backplane Bus → Interface Module → PLC Input Data
When a field contact changes state, the module processes the electrical transition and updates the corresponding input information. The specified transition delay is 15 ms from signal 0 to signal 1 and 45 ms from signal 1 to signal 0. The difference matters when the PLC monitors short-duration events or sequences that depend on precise switching times.
Each channel has a green status LED, but the module does not provide a diagnostic function. If the controller receives an unexpected state, technicians should check the actual input voltage, field wiring, terminal assignment, and PLC input address rather than relying on the indicator alone.
Role in the SIMATIC ET 200S Control Architecture
This module handles discrete AC signal acquisition at the field level. It converts compatible 230 V AC switching conditions into input data that the PLC can use to determine equipment status and execute control sequences.
AC Field Devices → 6ES7131-4FB00-0AB0 → ET 200S Backplane Bus → Interface Module → SIMATIC PLC
| System Element | Function |
|---|---|
| 6ES7131-4FB00-0AB0 | Acquires two 230 V AC digital input signals |
| Field Switches and Contacts | Supply discrete equipment-status signals |
| ET 200S Terminal Module | Provides the electrical interface for field wiring |
| ET 200S Interface Module | Connects the distributed I/O station to the controller |
| SIMATIC PLC | Processes the input states and executes control logic |
| Engineering Configuration | Defines station parameters and input addresses |
Industrial Applications
| Application | Typical Use |
|---|---|
| Industrial Machine Control | Monitoring compatible AC-operated limit switches and auxiliary contacts |
| Motor Control Cabinets | Reading equipment status through suitable auxiliary contacts |
| Manufacturing Equipment | Collecting discrete operating-state signals |
| Material Handling Systems | Monitoring switching points and equipment positions |
| Production Line Interlocks | Supplying contact states to PLC sequence logic |
| Industrial Utility Equipment | Monitoring AC switching devices in local control panels |
| Distributed Control Cabinets | Collecting field signals near the controlled equipment |
Installation and Maintenance
- Verify the module number: Confirm that 6ES7131-4FB00-0AB0 is the required two-channel 230 V AC input module.
- Check the circuit voltage: Verify that the field circuit operates within the module’s specified AC voltage and frequency ranges.
- Review terminal assignments: Match the signal, line, and neutral connections to the correct terminal positions for the installed terminal module.
- Isolate the electrical supply: Disconnect the relevant circuits and follow the site’s electrical safety and lockout procedures before installation or removal.
- Inspect field wiring: Check for loose connections, damaged insulation, incorrect terminal assignments, or signs of overheating.
- Verify switching devices: Confirm that the connected contacts and switches are suitable for the 230 V AC input circuit.
- Check module seating: Ensure the electronic module is correctly installed in its ET 200S station and properly engaged with the terminal module.
- Observe channel LEDs: During controlled testing, compare each green indicator with the actual state of the corresponding field contact.
- Measure unexpected input signals: If a channel does not change state, check the voltage at the input terminal against the specified signal thresholds.
- Check PLC addressing: Confirm that the physical channel corresponds to the configured input address and that the control program reads the correct signal.
- Account for input delay: Consider the 15 ms ON transition and 45 ms OFF transition when investigating timing-related problems.
- Document maintenance results: Record channel assignments, wiring changes, test results, and any faults identified during inspection.
Compatible System Components
| Component | Function |
|---|---|
| SIMATIC ET 200S Terminal Module | Provides the electrical connection interface for the input module |
| ET 200S Interface Module | Connects the distributed I/O station to the automation system |
| SIMATIC PLC | Processes the acquired digital input data |
| Compatible 230 V AC Switches | Supply discrete signals within the specified input limits |
| Auxiliary Contacts | Provide equipment-status signals where electrically suitable |
| AC Field Wiring | Carries the input signals and associated circuit connections |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Siemens 6ES7131-4EB00-0AB0 | SIMATIC ET 200S Digital Input Electronic Module | A two-channel 120 V AC variant; the input voltage differs from this model |
| Siemens 6ES7131-4CD02-0AB0 | SIMATIC ET 200S Digital Input Electronic Module | Supports a different 24–48 V AC/DC input configuration |
| Siemens 6ES7131-4BB01-0AA0 | SIMATIC ET 200S Digital Input Electronic Module | A 24 V DC input variant; verify signal requirements before selecting |
| Siemens 6ES7131-4BD01-0AA0 | SIMATIC ET 200S Digital Input Electronic Module | A different 24 V DC input configuration; not a direct electrical substitute |
Key Advantages
- Two dedicated 230 V AC digital input channels.
- Individual green LEDs for local signal-state checks.
- Defined input thresholds for conventional AC switching circuits.
- Electrical isolation between input channels and the backplane bus.
- Integration with the SIMATIC ET 200S distributed I/O architecture.
Technical FAQs
What is the difference between the 6ES7131-4FB00-0AB0 and the 6ES7131-4EB00-0AB0?
The 6ES7131-4FB00-0AB0 is a two-channel 230 V AC input module, whereas the 6ES7131-4EB00-0AB0 is rated for 120 V AC inputs. Their nominal input voltages differ, so the correct variant must match the field circuit.
Why does the module specify different ON and OFF transition delays?
The module has a 15 ms delay for the transition from signal 0 to signal 1 and a 45 ms delay for the reverse transition. These values affect how quickly changes are reflected in the input data and should be considered when diagnosing short pulses or sequence-timing issues.
Can the module identify a broken field wire through its own diagnostics?
No. This module does not provide a diagnostic function. A missing input requires checks of the field contact, circuit voltage, wiring, terminal connections, and controller input assignment.
What should be checked if an input signal remains OFF despite a closed contact?
Measure the voltage at the input terminal and verify that it reaches the specified signal 1 range of 164–264 V AC. Also check the neutral connection, terminal assignment, field wiring, and PLC address. Do not assume the contact is delivering a valid input merely because it appears mechanically closed.