Schneider BMXDDI1602 Discrete Input Module 24V DC

BMXDDI1602 – 16-Channel 24V DC Sink Input for Modicon X80

Reliable Field Signal Acquisition

The BMXDDI1602 discrete input module reads 16 digital signals from sensors, switches, and pushbuttons. It uses positive logic (sink) at 24V DC, which matches most standard industrial sensors. This module belongs to the Modicon X80 family and works perfectly with M340 and other X80-compatible controllers.

You can wire each input in 2-wire or 3-wire configuration. The input impedance sits at 6800 Ohm, drawing only 3.5mA per channel at 24V DC. Consequently, the module keeps total power consumption low while maintaining reliable signal detection.

Key Technical Specifications

Input channels: 16 isolated sink inputs.
Rated voltage: 24V DC.
Input current: 3.5mA typical at 24V DC.
On-state voltage guarantee: ≥11V.
Off-state voltage guarantee: <5V.
On-state current guarantee: ≥2mA.
Off-state current guarantee: ≤1.5mA.
Input impedance: 6800 Ohm.
Typical response time: 4ms.
Maximum response time: 7ms.
Sensor power supply range: 19–30V DC.

Additionally, the BMXDDI1602 includes reverse polarity protection on each input. This feature prevents damage from accidental wiring errors. Furthermore, you can parallel multiple inputs for higher current applications if needed.

Power Consumption and Isolation

Typical current draw: 76mA at 24V DC.
3.3V DC bus consumption: ≤107mA.
Power dissipation: 2.5W.
Isolation voltage: 1500V AC for 1 minute between channels and the bus.
Insulation resistance: >10 MOhm at 500V DC.

The module also provides voltage detection thresholds for sensor fault monitoring. It reports a sensor fault when voltage drops below 14V DC. Normal operation is confirmed above 18V DC.

Status LEDs and Diagnostics

Local signalling on the BMXDDI1602 includes:

• RUN (green): module operating normally.

• ERR (red): module error.

• I/O (red): input/output fault.

• One green LED per channel: indicates input signal status.

These LEDs help you troubleshoot field wiring quickly without opening a programming tool.

Mechanical and Environmental Ratings

Dimensions: 103.7mm (H) x 32mm (W) x 86mm (D).
Weight: 0.115 kg.
IP rating: IP20 for protected control cabinets.
Operating temperature: 0…60°C (32…140°F).
Storage temperature: -40…85°C (-40…185°F).
Relative humidity: 5–95% at 55°C, non-condensing.
Operating altitude: 0–2000m normally, up to 5000m with derating.
Vibration resistance: 3gn.
Shock resistance: 30gn.
Pollution degree: 2.
Fungal spore resistance: Class 3B2.

MTBF and Reliability

The BMXDDI1602 offers a Mean Time Between Failures (MTBF) of 775,000 hours. This high reliability reduces unplanned downtime and maintenance costs. Hot swapping is fully supported, so you can replace a faulty module without powering down the entire rack.

Installation Guidelines

First, insert the BMXDDI1602 into any standard X80 or M340 I/O slot. The module is hot-swappable, but always check that the bus is stable before removal. Next, wire your 24V DC sink devices to the terminal block. Connect the common (0V) to the module's return terminal. Finally, apply sensor power between 19V and 30V DC.

For best noise immunity, use shielded cables in high-EMI environments. Keep input wiring separate from power cables.

Compatibility and System Integration

The BMXDDI1602 integrates with:

• Modicon M340 programmable logic controllers

• Modicon X80 I/O racks

• Unity Pro and EcoStruxure Control Expert software

Moreover, it works alongside analog, output, and communication modules in the same rack. The module supports positive logic only. For negative logic (source) applications, use the BMXDDI1603 instead.

Packaging List

• BMXDDI1602 discrete input module (1 unit)

• 20-pin screw terminal block (pre-installed)

• Bus connector cover

• Product quick reference card

Note: No certificates or warranty documents are included. Sensor power supply sold separately.

Shipping & Delivery

All orders ship via FedEx, UPS, or DHL with full tracking. Anti-static packaging protects the module during transit.

Frequently Asked Questions (FAQ)

1. Can the BMXDDI1602 accept inputs from NPN or PNP sensors?
It accepts PNP sensors only (sourcing outputs). The module uses positive logic (sink input), so the sensor must provide a positive 24V signal when active.

2. What is the difference between BMXDDI1602 and BMXDDI1603?
The BMXDDI1602 uses positive logic (sink, 24V DC). The BMXDDI1603 uses negative logic (source, 24V DC). Choose based on your sensor type.

3. Can I hot swap the BMXDDI1602 while the system runs?
Yes. The Modicon X80 platform supports hot swapping. Remove and insert the module without powering down the rack or affecting other I/O modules.

4. What happens if I apply 30V DC to an input?
The module tolerates up to 30V DC on the sensor power supply. Each input is rated for 24V nominal with reverse polarity protection. However, exceeding 30V may damage the module.

5. Why do my inputs respond slower than 4ms?
The typical response time is 4ms, but filtering or software scanning can add delay. Check your controller's task cycle time and any input filter settings in Unity Pro or Control Expert.