Product Overview
The Schneider Electric STBDDI3725 Basic Digital Input Module is a reliable discrete signal interface designed for the Modicon Advantys STB distributed I/O platform. This module enables controllers and PLC systems to capture and process digital signals from field devices such as proximity sensors, pushbuttons, limit switches, and relay contacts.
Engineered for stable performance in industrial environments, the STBDDI3725 offers fast signal detection, strong electrical isolation, and integrated protection mechanisms. With its compact profile and compatibility with Advantys STB I/O bases, the module helps automation engineers build scalable distributed control architectures while maintaining efficient panel layouts and reduced wiring complexity.
This module is particularly suitable for machine automation, packaging lines, material handling systems, and factory monitoring applications where reliable digital signal acquisition is essential.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Schneider Electric |
| Model Number | STBDDI3725 |
| Module Type | Basic Digital Input Module |
| Product Series | Modicon Advantys STB |
| Digital Inputs | 16 Inputs |
| Input Voltage | 24 V DC |
| Input Voltage Limits | 11–30 V (Logic 1), −3–5 V (Logic 0) |
| Input Logic | Positive Logic (Type 3) |
| Input Current | 4.5 mA per channel |
| Response Time | 2 ms (off-to-on / on-to-off) |
| Channel Isolation | 1500 V between channels and logic bus |
| Supply Method | Power Distribution Module |
| Current Consumption | 100 mA at 5 V DC logic bus |
| Protection Features | Reverse polarity protection, resistor-limited input |
| LED Indicators | Module status LED + channel status LEDs |
| Protection Rating | IP20 |
| Operating Temperature | 0 °C to 60 °C |
| Dimensions (W × D × H) | 125 × 65.1 × 18.4 mm |
| Weight | Approx. 0.086 kg |
| Certifications | CE, UL, CSA, FM Class 1 Div.2 |
| Compatible Base | STBXBA3000 |
| Compatible Power Module | STBPDT3100 / STBPDT3105 |
Typical Industrial Applications
Machine Automation Systems
Captures digital signals from machine sensors and switches, enabling accurate machine state monitoring and operational logic processing.
Packaging and Bottling Equipment
Detects product presence, conveyor status, and safety interlocks, ensuring consistent and safe production flow.
Material Handling & Conveyor Systems
Used to monitor limit switches, optical sensors, and safety devices in logistics and automated transport lines.
Distributed PLC Control Systems
Allows decentralized data acquisition from field devices connected to PLCs through industrial communication networks.
Key Advantages
High Reliability Signal Acquisition
Ensures stable digital signal monitoring from industrial sensors and field devices.
Fast Input Response
With a typical response time of 2 ms, the module captures rapid signal transitions in dynamic machine operations.
Strong Electrical Isolation
1500 V isolation between channels and logic bus protects controllers from electrical disturbances.
Compact Modular Design
Slim form factor supports efficient panel layouts and easy installation within Advantys STB distributed I/O systems.
Integrated Protection Features
Built-in reverse polarity and resistor-limited protection improve system safety and durability.
Technical FAQs
1. How many digital inputs does the STBDDI3725 module provide?
The module provides 16 discrete digital input channels.
2. What voltage level do the inputs operate at?
It operates with 24 V DC input signals, common for industrial sensors and switches.
3. What is the typical input response time?
The module detects signal transitions in approximately 2 ms.
4. Does the module provide electrical isolation?
Yes, there is 1500 V isolation between channels and the logic bus.
5. Which base module is required for installation?
The module is designed to mount on the STBXBA3000 I/O base.
6. What protection mechanisms are included?
It includes reverse polarity protection and resistor-limited input protection.
7. Can the module be replaced without shutting down the system?
The module supports cold swapping and limited hot-swap capability depending on the system configuration.
8. What indicators are available for diagnostics?
LED indicators display module status and individual input channel states.
9. What industries commonly use this module?
Typical industries include manufacturing, packaging, semiconductor production, and automated assembly.
10. What field devices can be connected to this module?
It can connect to proximity sensors, pushbuttons, limit switches, relay contacts, and safety switches.
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