STBDDI3725KS

Configured for 24 VDC discrete signal acquisition in the Modicon STB distributed I/O system, the Schneider Electric STBDDI3725KS (STBDDI3725KS Basic Digital Input Kit) provides direct physical input execution for positive logic field devices through screw terminal connections.

Hardware Specifications

Parameter	Specification
Model	STBDDI3725KS
Brand	Schneider Electric
Product Type	Basic Digital Input Kit
Series	Modicon STB Distributed I/O
Weight	0.086 kg
Dimensions	125 mm (W) x 65.1 mm (D) x 18.4 mm (H)
Operating Temp	-25 to 70 deg C without derating
Power Consumption	100 mA at 5 VDC logic bus
Input Channels	16 discrete inputs
Input Voltage	24 VDC
Input Logic	Positive logic
Input Current	4.5 mA at 24 VDC
Input Response Time	2 ms off to on, 2 ms on to off
Input Filtering	1 ms
Electrical Connection	Screw terminal
Protection	Input protection resistor-limited, reverse polarity protection
Protection Rating	IP20
Certifications	CE, UL, CSA, FM Class 1 Division 2
Standard Compliance	IEC 61131-2 Type 3

Profinet / EtherNet/IP Deterministic Networks and I/O Density Scaling

The STBDDI3725KS integrates into the Modicon STB modular distributed I/O architecture through a network interface module and power distribution structure. The 16-channel digital input arrangement provides I/O density scaling for machine control systems requiring compact field signal collection. The module processes discrete voltage states with defined input thresholds and provides LED channel indication for local diagnostic observation.

The kit composition includes the STBDDI3725 module, STBXBA3000 I/O base, and STBXTS1180 18-terminal screw connector. It supports compatibility with STBPDT3100 and STBPDT3105 power distribution modules for distributed field wiring configurations.

Frequently Asked Questions

Q: What type of field signals can STBDDI3725KS process?
A: The module processes 24 VDC discrete input signals with positive logic configuration. It supports 16 type 1 discrete inputs with defined voltage state recognition.

Q: What is the logic bus current requirement of STBDDI3725KS?
A: The module consumes 100 mA at 5 VDC from the logic bus supplied through the Modicon STB power distribution structure.

Q: Can STBDDI3725KS be replaced in existing Modicon STB installations?
A: STBDDI3725KS is part of the Modicon STB distributed I/O range. Schneider Electric lists NTSDDI1602XK as the recommended replacement product for this discontinued model.

Field Installation Guidelines

Install the STBDDI3725KS on the compatible STBXBA3000 I/O base with the designated STBPDT3100 or STBPDT3105 power distribution module. Verify terminal wiring according to the positive logic input configuration before energizing field circuits.

Use shielded wiring practices where input cables are installed near high-noise electrical equipment. Keep low-level digital signal wiring separated from power conductors and apply proper grounding methods for the cabinet enclosure.

Confirm network interface module compatibility, power distribution arrangement, and field device voltage levels before commissioning. Check LED indicators after startup to verify module status and individual input channel operation.

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