Description:The ABB 1KHL015545R0001 (O4LE Series) is a digital I/O Cradle / Base Module manufactured by ABB for use in ABB Industrial IT, Advant OCS, and compatible distributed control or PLC systems. It provides the physical interface between the system backplane and field wiring, offering 8 digital inputs and 8 digital outputs at 24 V DC, with spring-cage terminal blocks for secure, vibration-resistant field connections. The 1KHL015545R0001 is the foundation onto which the electronic I/O plug-in module seats, distributing both signal paths and system power to the active electronics.h2 Application Scenarios:In a combined-cycle power plant’s balance-of-plant (BOP) auxiliary control system built on ABB hardware, the condensate pump local start/stop pushbuttons and limit-switch feedbacks are wired into an O4LE I/O cradle in the marshalling cabinet. During a routine cabinet cleaning, a technician noticed one cradle’s spring terminals had fatigued, causing intermittent DI signal dropouts that occasionally triggered spurious pump alarms. The maintenance team replaced the faulty unit with the ABB 1KHL015545R0001. Because the 1KHL015545R0001 is a direct plug-in cradle—the electronic I/O module simply transfers to the new base—the swap took less than five minutes with no re-wiring of the 16 field conductors. Signal stability was immediately restored, and the plant avoided a forced re-termination of dozens of wires that would have required a controlled shutdown. This illustrates the 1KHL015545R0001‘s practical value: it is the first point of failure in field-wiring stress and the fastest, lowest-risk component to replace in keeping legacy I/O systems online.h2
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1KHL015545R0001 (O4LE Series) |
| Manufacturer | ABB (ASEA Brown Boveri) |
| Product Category | I/O Cradle / Base Module (Digital I/O Interface Base) |
| I/O Configuration | 8 × Digital Input (DI) + 8 × Digital Output (DO) @ 24 V DC |
| Nominal Voltage | 24 V DC (Typical control voltage; sink/source per plugged I/O electronics) |
| Terminal Type | Spring-cage / tension clamp terminals — vibration-resistant, tool-assisted release |
| Backplane Interface | Proprietary ABB O4L / Advant rack edge connector — mates with plug-in I/O electronics module |
| Mounting Method | Rack slot / DIN-rail compatible base (per system chassis) |
| Indicators | Per-channel LED via mated I/O plug-in module (not on cradle itself) |
| Operating Temp. | -25 °C to +70 °C |
| Protection Rating | IP20 (installed inside enclosed cabinet) |
| Dimensions (Approx.) | 105 × 75 × 32 mm (L × W × H) |
| Weight (Approx.) | 0.20 – 0.25 kg |
h2 Technical Principles and Innovative Values:
- Field-Wiring Preservation via Separate Cradle & Electronics: The 1KHL015545R0001 decouples the field-termination base (cradle) from the intelligent I/O electronics module. This means the cradle can be replaced for mechanical wear or terminal fatigue without disturbing any field wires—only the plug-in electronics are transferred—dramatically reducing MTTR compared to integrated I/O blocks.
- Vibration-Resistant Spring-Clamp Terminals: Unlike screw terminals that loosen under sustained cabinet vibration (common near large rotating equipment), the ABB 1KHL015545R0001 uses spring-pressure clamp technology that maintains constant contact force on stripped wire ends, minimizing connection-related DI/DO faults in heavy-industry environments.
- Backplane Bus Compatibility with ABB Ecosystem: The cradle’s gold-finger backplane connector is mechanically keyed and electrically matched to ABB O4L-series I/O plug-ins and Advant / AC 800M-family racks, ensuring signal integrity and hot-swap compatibility (where system permits) without jumpers or DIP-switch addressing—plug, seat, and the system auto-enumerates.
