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KONGSBERG RMP420 – Remote Multipurpose Input/Output Module
Product Overview
The KONGSBERG RMP420 is a 32-channel Remote Multipurpose I/O module used in Kongsberg marine automation and integrated control systems. It provides software-configurable field channels that can be assigned to analog input, analog output, digital input, digital output, RTD, pulse, frequency, or encoder functions. The module communicates with the host controller through two galvanically isolated RBUS interfaces, allowing redundant remote I/O communication in distributed vessel automation installations. Kongsberg lists RMP420 as an I/O unit for K-Chief systems, with KM Article Number 306712. The module is also designed for Ex Zone 2 applications and supports built-in diagnostics and fail-safe functions.
Technical Specifications — RMP420
| Parameter | Value |
|---|---|
| Product Model | RMP420 |
| Manufacturer | Kongsberg Maritime |
| KM Article Number | 306712 |
| Product Type | Remote Multipurpose Input/Output Module |
| Number of I/O Channels | 32 |
| Channel Configuration | Individually software configurable |
| Digital Input | DI, NAMUR, PNP/NPN compatible |
| Digital Output | Short-circuit protected high-side driver |
| Analog Input | 0–20 mA, 0–4 V, 0–10 V |
| Analog Output | 0–20 mA or 0–10 V |
| RTD | PT100, 2- or 3-wire |
| Pulse/Frequency | Up to 10 kHz |
| Encoder Input | Up/Down, up to 2.5 kHz |
| Supply Voltage | 24 VDC, 18–31.2 V |
| Communication | 2 × RBUS, isolated RS-485 |
| Power Consumption | Approx. 10 W typical |
| Operating Temperature | −15 to +70 °C |
| Storage Temperature | −25 to +70 °C |
| Humidity | Up to 98% RH |
| Protection | IP20 |
| Dimensions (HxWxD) | 355 × 158 × 87 mm |
| Weight | Approx. 1.35 kg |
| Mounting | Vertical DIN rail |
| Compliance | IACS E10, IEC 60945, IEC 60335, IEC/EN 60079-0/-7 |
| Hazardous Area Approval | Presafe 18ATEX12094X, II 3G Ex ec IIC T4 Gc |
Technical values are taken primarily from the current Kongsberg RMP420 technical data sheet.
KONGSBERG RMP420
Key Features and Benefits — RMP420
- 32 software-configurable solid-state channels for flexible field instrumentation.
- Supports AI, AO, DI, DO, PT100, pulse, frequency, and encoder applications.
- Dual isolated RBUS interfaces provide redundant communication paths.
- Built-in monitoring covers module temperature, internal voltages, memory, CPU, registers, earth faults, short circuits, and open circuits.
- Fail-safe functions are available for relevant output configurations.
- Suitable for distributed shipboard automation, alarm monitoring, propulsion-related control, and machinery monitoring applications.
- Designed for marine environmental requirements and certified for specified hazardous-area applications.
Related Models
RDIOR420 — A related RIO420-family remote digital I/O and relay module used in Kongsberg marine automation systems. It is listed alongside RMP420 in K-Chief hardware configurations.
RMP201-8 — An eight-channel RIO200-series remote multipurpose I/O module used for distributed Kongsberg automation applications.
RMP420S — A later RIO420-family variant documented in Kongsberg certification material for K-Chief and related systems.
RMP422i — A related Kongsberg remote I/O module appearing in K-Chief hardware documentation and intended for newer system configurations.
Installation and Maintenance — RMP420
Install the module vertically on the specified DIN rail and verify the 24 VDC supply remains within the stated voltage range. Check both RBUS connections, address configuration, grounding, and field termination before commissioning. Signal configuration should match the application engineering database because the channels are individually programmable.
During replacement, record the installed hardware revision, I/O configuration, RBUS addressing, and connected field devices. Avoid assuming that a physically similar RIO module is a direct substitute. The RMP420’s combination of configurable channels, isolated communication, and hazardous-area certification makes application verification particularly important. Kongsberg continues to document this module as part of its K-Chief automation platform.
Personally, I would check the channel configuration first when evaluating a replacement. With 32 multifunction channels, the part number alone does not tell the complete field-level configuration.
Product Warranty — RMP420
Warranty coverage depends on the supplier and unit condition, including new original, unused surplus, refurbished, or tested spare stock. Procurement documentation should state the exact KM article number, hardware revision, serial traceability, inspection status, and return terms.
The KONGSBERG RMP420 is a flexible 32-channel remote I/O platform for Kongsberg marine automation, combining multifunction field interfaces with redundant RBUS communication and marine/hazardous-area certifications.
