Schneider STBDDI3420K Digital Input Kit 4-Channel 24V DC

STBDDI3420K Product Introduction

The STBDDI3420K digital input kit provides a ready-to-use solution for acquiring 24V DC discrete signals. It is designed for Modicon STB distributed I/O networks. Manufactured by Schneider Electric, this kit includes four core components. These are the STBDDI3420 module, the STBXBA1000 base, and two types of 6-terminal connectors: the STBXTS1100 (screw type) and the STBXTS2100 (spring clamp). This flexible approach lets you choose the wiring method that best fits your installation.

Designed for versatility, the Schneider STBDDI3420K accepts both positive and negative logic inputs. Its four isolated channels operate at a nominal current of 8 mA each. Moreover, each channel can supply up to 100 mA to connected sensors. The module features user-selectable input filtering from 0.5 ms to 16 ms. This effectively eliminates noise and prevents false triggers in electrically noisy industrial settings.

Technical Specifications and Performance

The STBDDI3420K supports a rated supply voltage of 24V DC. It recognizes state 1 signals from 11V to 30V. It recognizes state 0 signals from -3V to 5V. The absolute maximum input voltage reaches 56V for 1.3 ms. This provides a safe margin against voltage spikes. The discrete input current is 8 mA. The guaranteed off-state current is ≤1.2 mA. The guaranteed on-state current is ≥2.5 mA.

Response times are equally impressive. The off-to-on transition takes 0.925 ms. The on-to-off transition takes 1.35 ms. Each has a tolerance of ±0.5 ms. Additionally, this digital input kit offers comprehensive protection. It includes reverse polarity protection and resistor-limited input protection. It also features an integrated 10 A time-lag fuse on the PDM. The insulation between channels and the logic bus is rated at 1500V for one minute. This ensures reliable isolation and operational safety.

Environmental and Mechanical Characteristics

The STBDDI3420K is built for tough industrial conditions. It operates without derating from -25°C to 70°C (-13°F to 158°F). Storage temperatures range from -40°C to 85°C (-40°F to 185°F). The kit also withstands 95% relative humidity at 60°C without condensation. Mechanically, the module stays compact. It measures only 125 mm wide, 65.1 mm deep, and 18.4 mm high.

Furthermore, it offers excellent resistance to vibration and shock. On a 35 x 7.5 mm DIN rail, it tolerates 3 gn at 58–150 Hz. On a 35 x 15 mm rail, it handles 5 gn at the same frequency range. Shock resistance is rated at 30 gn for 11 ms. This conforms to IEC 88 reference 2-27. With an IP20 protection rating, the STBDDI3420K suits control cabinets well. It also complies with IEC 61131-2 Type 1 standards.

Installation and Compatibility

Installing the Schneider STBDDI3420K is straightforward. First, mount the STBXBA1000 base onto a standard DIN rail. Next, snap the STBDDI3420 module into place. Finally, terminate your field wiring using either the screw-type or spring-clamp connector. Both hot swapping and cold swapping are fully supported. This works when used with standard NIMs. As a result, you minimize downtime during maintenance or system reconfiguration.

This kit is specifically compatible with the STBXBA1000 I/O base. It also requires a power distribution module like the STBPDT3100 or STBPDT3105. The kit consumes only 45 mA from the 5V DC logic bus. This keeps overall system power consumption low. Visual diagnostics are provided by status LEDs. A green RDY LED indicates module health. Four green IN1–IN4 LEDs show channel status. A red ERR LED signals any errors.

Packaging List

• 1 x STBDDI3420 standard digital input module

• 1 x STBXBA1000 I/O base unit

• 1 x STBXTS1100 6-terminal screw-type connector

• 1 x STBXTS2100 6-terminal spring clamp connector

• Installation guide and user manual (digital copy available)

Shipping: All orders are dispatched via FedEx, UPS, or DHL with full tracking and secure packaging.

Frequently Asked Questions (FAQ)

1. What is the input voltage range for the STBDDI3420K?
The STBDDI3420K accepts a 24V DC nominal input. It recognizes state 1 from 11V to 30V. It recognizes state 0 from -3V to 5V.

2. Can I hot-swap the STBDDI3420 module?
Yes, hot swapping is supported with standard NIMs. You can replace modules without powering down the entire system. This greatly reduces maintenance downtime.

3. Does this kit include both connector types?
Absolutely. The Schneider STBDDI3420K includes both the STBXTS1100 screw type and the STBXTS2100 spring clamp. You gain full wiring flexibility.

4. What protection features are integrated into this kit?
It includes reverse polarity protection and resistor-limited input protection. It also has a 10 A time-lag fuse on the PDM. These features guard against wiring errors and overcurrent.

5. What is the response time of the STBDDI3420K inputs?
The off-to-on response is 0.925 ms. The on-to-off response is 1.35 ms. Each has a ±0.5 ms tolerance. You can also select from six filter settings from 0.5 ms to 16 ms.