Molex DRL-DPM-BKF

Technical Dossier

Product Details And Specifications

Molex DRL-DPM Series Technical Notes

The Evolution of DRL-DPM Architecture

The DRL-DPM architecture was developed to address the growing demand for modular, slot-based communication infrastructure in industrial control cabinets. Early iterations of the series focused on point-to-point backplane connectivity with fixed addressing schemes, compatible with legacy rack systems using parallel bus topologies. As industrial networking standards evolved — from proprietary fieldbus protocols toward open standards such as PROFIBUS-DP, DeviceNet, and Modbus RTU — the DRL-DPM series was progressively updated to support multi-protocol operation within a single form factor.

Compatibility considerations are critical for system integrators working with mixed-generation hardware. Early DRL-DPM modules used 5V backplane logic levels and are not directly interchangeable with later variants that adopted 3.3V signaling. Firmware revisions also introduced changes to the module's self-identification registers, which affects hot-swap behavior in racks running newer controller firmware. Engineers performing like-for-like replacements must verify hardware revision codes stamped on the module label before installation.

As the broader Molex industrial connectivity portfolio has matured, the DRL-DPM series has entered a maintenance and lifecycle-extension phase. New system designs increasingly reference successor platforms, but the DRL-DPM remains the only compatible option for a large population of installed racks that cannot be economically upgraded. This positions the series firmly in the long-term maintenance and spare parts category.

DRL-DPM Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented DRL-DPM series module range, classified by functional category. Each entry reflects a distinct hardware configuration with specific interface, addressing, or power characteristics.

Network Interface & Backplane Modules

• DRL-DPM-BKF: Backplane network interface module, fieldbus bridge, standard rack mount
• DRL-DPM-BKR: Backplane interface, redundant bus configuration, dual-port
• DRL-DPM-NIF: Network interface front-end, PROFIBUS-DP compatible, 12 Mbps max
• DRL-DPM-NIM: Network interface master module, multi-drop topology support
• DRL-DPM-NIS: Network interface slave module, remote I/O node termination

Digital I/O Modules

• DRL-DPM-DI8: 8-channel 24VDC digital input, sink/source configurable
• DRL-DPM-DI16: 16-channel 24VDC digital input, high-density, DIN rail compatible
• DRL-DPM-DO8: 8-channel 24VDC digital output, 0.5A per channel, short-circuit protected
• DRL-DPM-DO16: 16-channel 24VDC digital output, transistor type, sourcing
• DRL-DPM-DIO: Mixed 8DI/8DO combination module, single slot footprint

Analog I/O Modules

• DRL-DPM-AI4: 4-channel analog input, 4–20mA / 0–10V selectable, 12-bit resolution
• DRL-DPM-AI8: 8-channel analog input, differential, 16-bit resolution, HART-ready
• DRL-DPM-AO4: 4-channel analog output, 4–20mA, loop-powered, 12-bit DAC
• DRL-DPM-AO8: 8-channel analog output, voltage/current dual-mode, isolated

Power & Communication Modules

• DRL-DPM-PWR: Rack power distribution module, 24VDC input, backplane bus feed
• DRL-DPM-COM: Serial communication module, RS-232/RS-485 dual-port, Modbus RTU
• DRL-DPM-ETH: Ethernet gateway module, 10/100 Mbps, Modbus TCP/IP

Quality Control for the DRL-DPM Range

The DRL-DPM series presents specific quality verification challenges due to its backplane bus communication architecture. Standard functional tests applied to generic I/O modules are insufficient for validating backplane interface modules such as the DRL-DPM-BKF. DriveKNMS applies a multi-stage inspection protocol tailored to this series: