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- Schneider
- STBDDI3725KS
- Basic Digital Input Kit
- France
- 125 × 18.4 × 65.1 mm
- 0.086 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Schneider STBDDI3725KS is a Basic Digital Input Kit for the Modicon STB distributed I/O platform. It is used to acquire discrete field signals and make their status available to the controller through the STB island bus.
The kit format is useful for installations where the digital input function needs to be supplied as a complete kit rather than as an individual I/O module. Typical field signals include push buttons, selector switches, proximity sensors, limit switches, auxiliary contacts, and machine interlock feedback.
Within an STB island, the STBDDI3725KS can be combined with other digital and analog I/O modules to match the signal requirements of a machine or process. For replacement work, the complete kit designation should be checked rather than treating it as the same item as the standard STBDDI3725 module.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | STBDDI3725KS |
| Product Family | Modicon STB |
| Product Type | Basic Digital Input Kit |
| Input Type | Digital |
| Number of Inputs | 8 |
| Signal Type | Discrete ON/OFF |
| Rated Supply Voltage | 24 V DC |
| Module Type | Basic Digital Input Kit |
| Protection Degree | IP20 |
| Dimensions | 125 × 18.4 × 65.1 mm |
| Weight | 0.086 kg |
Product Features
- 8-channel digital input configuration for discrete field signals.
- Supports standard 24 V DC industrial input applications.
- Intended for use within a Modicon STB distributed I/O island.
- Kit configuration simplifies procurement for compatible STB installations.
- Suitable for switches, sensors, auxiliary contacts, and machine status signals.
- Can be integrated with other STB digital and analog I/O modules.
- Transfers field input states to the controller through the STB island architecture.
Working Principle
The STBDDI3725KS receives discrete signals from connected field devices and makes the resulting input states available to the STB island bus.
A typical signal path is:
Field Device → STBDDI3725KS → STB Island Bus → Network Interface Module → PLC / PAC
When a connected switch or sensor changes state, the corresponding input channel detects the electrical condition. The module communicates the channel status through the island bus, allowing the network interface module to exchange the information with the PLC or PAC.
The controller can then use these digital states for machine sequencing, interlocks, operating commands, equipment status monitoring, and alarm logic.
Role in a Modicon STB Distributed I/O Control Architecture
The STBDDI3725KS serves as the field signal acquisition point within the distributed I/O architecture.
| System Element | Function |
|---|---|
| Field Sensors / Switches | Generate discrete input signals |
| STBDDI3725KS | Acquires digital input states |
| STB Island Bus | Transfers I/O data between STB modules |
| Network Interface Module | Connects the STB island with the control network |
| PLC / PAC | Executes control logic and machine sequences |
| HMI / SCADA | Displays operating conditions and diagnostic information |
This architecture keeps field signal collection close to the equipment while allowing the controller to access the input data through the selected STB network interface.
Industrial Applications
| Application | Typical Input Signals |
|---|---|
| Machine Automation | Push buttons, selector switches, limit switches |
| Conveyor Systems | Product sensors, position switches, motor feedback |
| Packaging Machinery | Detection sensors, actuator feedback, interlock signals |
| Assembly Equipment | Fixture sensors, cylinder position switches, operator inputs |
| Motor Control | Contactor auxiliary contacts, running status, fault contacts |
| Process Equipment | Valve position contacts, pump status, local switches |
Installation and Maintenance
- Confirm that the STBDDI3725KS matches the required digital input configuration before installation.
- Verify the field signal voltage and wiring arrangement before connecting the kit.
- Install the supplied components correctly within the Modicon STB island.
- Check that all STB bus and terminal connections are fully seated.
- Use the appropriate terminal accessories for the selected field wiring method.
- Keep digital input wiring away from high-current conductors where practical.
- Check terminal connections for looseness during scheduled maintenance.
- Test each input channel by operating its associated field device.
- Verify the corresponding input status through the PLC or PAC diagnostic interface.
- If an input remains permanently ON or OFF, inspect the field device and wiring before replacing the I/O hardware.
- When replacing an existing kit, record the field wiring and I/O configuration before removal.
- After installation, test all connected input points and machine interlocks before placing the equipment back into service.
Related Components
| Component | Function |
|---|---|
| Modicon STB Network Interface Module | Provides communication between the STB island and PLC or PAC |
| STB Power Distribution Module | Distributes power within the STB island |
| STB Terminal Base | Provides the physical and electrical interface for the I/O module |
| STBXBA2000 | Supports STB island bus and module installation |
| STBDDI3725 | Basic digital input module for the corresponding input function |
| STBDDI3420 | Standard digital input module for other discrete input requirements |
| STBDDI3610 | Standard digital input module with a higher input channel count |
| STBDDO3600 | Digital output module for discrete actuator control |
| STBAVI1255 | Basic analog input module for voltage signals |
Recommended Related Models
| Model | Product Type | Typical Relationship |
|---|---|---|
| STBDDI3725 | Basic Digital Input Module | Individual module version for the same basic digital input function |
| STBDDI3420 | Standard Digital Input Module | Alternative for applications requiring a different digital input configuration |
| STBDDI3610 | Standard Digital Input Module | Suitable where a higher number of digital inputs is required |
| STBDDO3600 | Digital Output Module | Complements digital inputs for discrete actuator control |
| STBAVI1255 | Basic Analog Input Module | Adds voltage-based analog signal acquisition |
| STBACO1225 | Basic Analog Output Module | Adds current-based analog output capability |
| STBCPS2111 | Auxiliary Power Supply | Supports additional power distribution within an STB island |
Key Advantages
- 8-channel discrete input configuration.
- Suitable for 24 V DC digital field signals.
- Fits the Modicon STB distributed I/O architecture.
- Kit format simplifies component selection for compatible installations.
- Suitable for machine status, sensor, switch, and interlock signals.
- Can be combined with digital and analog STB I/O modules.
Technical FAQs
What is the difference between STBDDI3725KS and STBDDI3725?
STBDDI3725 is identified as a Basic Digital Input Module, while STBDDI3725KS is identified as a Basic Digital Input Kit. When replacing an existing installation, the complete ordering designation should be matched to the original equipment and supplied configuration.
How many digital input channels are available on the STBDDI3725KS?
The STBDDI3725KS provides 8 digital input channels for discrete field signals. These inputs can be used for compatible switches, sensors, auxiliary contacts, and machine status signals.
Where does the STBDDI3725KS sit in the STB control architecture?
It is installed at the distributed field I/O level. Field signals enter the kit, input states are transferred through the STB island bus, and the network interface module exchanges the data with the PLC or PAC.
What should be checked when an STBDDI3725KS input is not detected by the controller?
Check the field device, signal voltage, wiring, terminal connection, and corresponding input status first. If the field signal reaches the correct terminal but the controller still does not detect the channel state, inspect the STB island connection and I/O hardware.