Product Overview
When a distributed I/O system demands reliable digital input sensing, the Schneider STBDDI3725KS Basic digital input kit delivers consistent performance. This kit integrates the STBDDI3725 module, STBXTS1180 18-terminal screw connector, and STBXBA3000 base into a single, easy-to-deploy package. Designed for the Modicon STB distributed I/O solution, it provides 16 discrete inputs at 24 V DC, making it a solid choice for industrial automation applications.
Technical Specifications Breakdown
The STBDDI3725KS operates with a discrete input voltage of 24 V DC. Its input voltage limits are 11...30 V at state 1 and -3...5 V at state 0, with a permissible voltage of 30 V. Each channel draws 4.5 mA, with state 0 current guaranteed at ≤1.5 mA and state 1 current at ≥2.5 mA. The response time is 2 ms for both off-to-on and on-to-off transitions. Protection features include power protection via an integrated fuse on the PDM (time lag 5 A), input resistor-limited protection, and reverse polarity protection. Insulation between channels and the logic bus is rated at 1500 V for 1 minute. The module supports cold swapping and hot swapping for basic NIMs, ensuring minimal downtime during maintenance.
Industry Applications
In manufacturing lines where 24 V DC sensors monitor part presence or machine status, the STBDDI3725KS provides a straightforward interface. Its 16 inputs handle multiple discrete signals, such as limit switches or proximity sensors, within a single compact unit. The IP20 protection rating makes it suitable for control cabinets in dry indoor environments. For maintenance engineers, the ability to hot swap the module without powering down the entire rack reduces production interruptions.
Installation & Setup Guidance
Mount the STBXBA3000 base onto a 35 x 7.5 mm or 35 x 15 mm symmetrical DIN rail. Secure the base using the integrated locking mechanism. Insert the STBDDI3725 module onto the base until it clicks. Connect field wiring to the STBXTS1180 18-terminal screw connector, matching the 24 V DC supply and sensor outputs. Use a power distribution module such as the STBPDT3100/3105 to supply the 24 V DC rated supply voltage. Verify the module status LED (green RDY) and channel LEDs (green IN1 to IN16) illuminate correctly after power-up.
Maintenance & Reliability
Regularly inspect the module for dust accumulation or loose connections. The STBDDI3725KS operates within an ambient air temperature range of -25…70 °C without derating and can be stored at -40…85 °C. Its relative humidity tolerance is 95% at 60 °C without condensation. The vibration resistance is 3 gn at 58…150 Hz on 35 x 7.5 mm DIN rail and 5 gn at 58…150 Hz on 35 x 15 mm DIN rail, with +/-0.35 mm at 10…58 Hz. Shock resistance is 30 gn for 11 ms per IEC 88 reference 2-27. These environmental ratings ensure reliable operation in typical industrial settings.
Compatibility & Integration
The STBDDI3725KS integrates seamlessly with the Modicon STB distributed I/O solution. It is compatible with the STBXBA3000 I/O base and power distribution modules STBPDT3100/3105. The module consumes 100 mA at 5 V DC for the logic bus. It carries CE, UL, FM Class 1 Division 2, and CSA certifications, meeting EN/IEC 61131-2 type 3 standards. For system integration, verify the NIM (network interface module) supports hot swapping for basic modules.
Selection Guide & Purchasing Advice
Before ordering the STBDDI3725KS, confirm your system uses Modicon STB distributed I/O and requires 16 discrete 24 V DC inputs. Ensure the power distribution module matches the 24 V DC supply. The kit includes the module, base, and connector, simplifying procurement. SpareTechPLC stocks this kit and can advise on availability and lifecycle status. Contact us for current pricing and lead times.
Frequently Asked Questions
Q: What is the input voltage range for the STBDDI3725KS?
A: The input voltage limits are 11...30 V at state 1 and -3...5 V at state 0, with a permissible voltage of 30 V.
Q: How many inputs does the STBDDI3725KS provide?
A: It provides 16 discrete inputs.
Q: Can I swap the module while the system is powered?
A: Yes, the module supports hot swapping for basic NIMs, allowing replacement without powering down the rack.
Q: What certifications does the STBDDI3725KS hold?
A: It carries CE, UL, FM Class 1 Division 2, and CSA certifications.
Q: What is the response time of the inputs?
A: The response time is 2 ms for both off-to-on and on-to-off transitions.
