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KONGSBERG RMP420 Remote Multipurpose I/O Module

RMP420 is a long-range multi-purpose input/output (I/O) module introduced by KONGSBERG. It is the core distributed I/O unit of the K-Chief 500/600 ship automation system. It is specially designed for high-reliability control scenarios in the field of offshore engineering and industrial automation. The module is responsible for collecting sensor signals and driving actuators in the engine room, pump room, deck and other locations far away from the main control room, greatly reducing long-distance

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Product Details

1. Product Overview

The Kongsberg RMP420 (part no. 306712) is a Remote Multipurpose Input/Output Module manufactured by Kongsberg Maritime AS of Norway, and is a core distributed I/O unit in the K-Chief series marine alarm monitoring and integrated control systems. This module is designed for on-site signal acquisition and control output on ships, communicating with the RCU main controller via redundant I/O bus (RBUS), enabling acquisition of temperature, pressure, level, flow, status and other signals, and control output of pumps, valves, alarms and other equipment in various ship areas.

The RMP420 is equipped with 32 software-configurable multipurpose solid-state channels, each channel can be configured via software as analog input, analog output, digital input, digital output, or pulse/frequency interface, flexibly adapting to different field signal requirements without hardware replacement, greatly reducing spare part types and system configuration complexity. Analog input supports 0-10V voltage and 0-20mA (including 4-20mA) current signals, with measurement accuracy up to ±0.15% full scale; analog output supports 0-10V voltage and 0-20mA current signals, with accuracy ±0.35% full scale, can directly drive field devices such as control valves, indicators, etc.

In terms of communication, the RMP420 connects to the RCU main controller via redundant RBUS, using 2 9-pin male D-Sub connectors, RS485 electrical interface, with galvanic isolation. Dual bus redundancy design ensures high communication reliability. The module I/O circuit power output has short-circuit protection function, providing reliable power support for field sensors, avoiding module damage caused by field short circuits.

The RMP420 is powered by 24V DC, with operating voltage range 18-31.2V, typical power consumption 10W, adapting to ship power grid voltage fluctuations. Operating temperature range is -15°C to +70°C, can operate stably in high-temperature environments such as ship engine rooms. Protection rating is IP20 (module level), designed for installation in control cabinets, dimensions 355×158×87mm, weight 1.35kg, adopts 35mm DIN rail vertical mounting, easy installation and maintenance.

This module is approved for Ex Zone 2 (hazardous area Zone 2) applications, can be installed in areas with explosive gas risk (such as pump rooms, cargo hold perimeters, etc.), certified by major classification societies such as DNV-GL, ABS, LR, BV, etc., widely used in K-Chief automation systems on various commercial ships, offshore platforms, and special vessels. The product is genuine Kongsberg original, with a 12-month quality warranty.

2. Specifications

表格

Parameter	Value
Brand	Kongsberg Maritime AS (Norway)
Model	RMP420
Part No.	306712 (reference, may vary by version)
Product Type	Remote Multipurpose Input/Output Module
Applicable System	K-Chief series marine alarm monitoring and integrated control systems
Total I/O Channels	32 software-configurable multipurpose solid-state channels
Channel Configuration	Software configurable, no hardware replacement required
Analog Input (AI)	0-10V DC voltage / 0-20mA DC current (including 4-20mA)
AI Measurement Accuracy	±0.15% Full Scale (FS)
AI Max Wire Resistance	25 Ω/wire
AI Response Time	1000 ms
Analog Output (AO)	0-10V DC voltage (internal resistance 1kΩ) / 0-20mA DC current
AO Accuracy	±0.35% Full Scale (FS), voltage output ±0.5%
AO Min Load Resistance	500 Ω (current output)
Digital Input (DI)	Supported (specific voltage range to be confirmed, reference 24V DC)
Digital Output (DO)	Supported (solid-state output, specific capacity to be confirmed)
Pulse/Frequency Interface	Supported (max frequency to be confirmed)
Communication Interface	Redundant RBUS, 2×9-pin male D-Sub connectors
Communication Type	RS485, Galvanic Isolation
Communication Redundancy	Dual bus redundancy
Supply Voltage	24 V DC (nominal), operating range 18-31.2 V DC
Typical Power Consumption	10 W
Max Power Consumption	To be confirmed (reference 15-20W)
I/O Power Output	With short-circuit protection, can power field sensors
Operating Temperature	-15°C ~ +70°C
Storage Temperature	-25°C ~ +70°C (reference, some sources -25°C ~ +85°C)
Humidity	Up to 98% RH (operating/storage)
Protection Degree	IP20 (IEC 60529, module level)
Explosion-proof Certification	Approved for Ex Zone 2
Classification Society Certification	DNV-GL, ABS, LR, BV (complete list to be confirmed)
EMC Standard	To be confirmed (reference complies with marine EMC related standards)
Vibration	To be confirmed (reference 2g RMS, 5-350Hz)
Shock	To be confirmed (reference 15g, 20ms half-sine)
Dimensions (H×W×D)	355 × 158 × 87 mm
Weight	1.35 kg
Mounting Method	35mm DIN rail vertical mounting (35 7.5/15)
Wiring Method	Screw terminals (specific specifications to be confirmed)
Configuration Tool	Kongsberg system configuration software
Life Prediction	GB 25°C (60% confidence): 38.5 years; NS 35°C (environmental derating): to be confirmed
MTBF	To be confirmed (high reliability, reference > 100,000 hours)
Country of Origin	Norway (Kongsberg Maritime factory)
HS Code	To be confirmed (reference 85371090 or 85437090)
Stock Status	Order available
Warranty Period	12 months

3. Key Features

32-Channel Software-Configurable Multipurpose I/O — Equipped with 32 software-configurable multipurpose solid-state channels, each channel can be flexibly configured via software as analog input, analog output, digital input, digital output, or pulse/frequency interface, adapting to different field signal requirements without hardware replacement, greatly reducing spare part types and lowering system configuration and maintenance complexity.
High-Precision Analog Acquisition and Output — Analog input supports 0-10V voltage and 0-20mA (including 4-20mA) current signals, measurement accuracy up to ±0.15% full scale, ensuring accurate acquisition of process signals such as temperature, pressure, level, flow; analog output supports 0-10V voltage and 0-20mA current, accuracy ±0.35% full scale, can directly drive field devices such as control valves, indicators, meeting precise control requirements.
Redundant RBUS Communication — Communicates with RCU main controller via redundant RBUS, using 2 9-pin male D-Sub connectors, RS485 electrical interface, with galvanic isolation. Dual bus redundancy design ensures that when one bus fails, the other automatically takes over, communication is not interrupted, meeting high reliability requirements of critical ship monitoring and control systems.
Ex Zone 2 Explosion-proof Certification — Approved for Ex Zone 2 applications, can be installed in areas with explosive gas risk (such as pump rooms, cargo hold perimeters, oil tank perimeters, etc.), expanding module application range, meeting signal acquisition and control requirements in ship hazardous areas without additional explosion-proof isolation measures.
24VDC Wide Voltage Power Supply and Short-Circuit Protection — 24V DC power supply, operating voltage range 18-31.2V, adapting to ship power grid voltage fluctuations and drops. I/O circuit power output has short-circuit protection function, can provide reliable power for field sensors, avoiding module damage caused by field wiring short circuits, improving system robustness.
Marine-Grade Wide Temperature Range and Environmental Adaptability — Operating temperature range -15°C to +70°C, humidity up to 98% RH, can operate stably in high-temperature and high-humidity environments such as ship engine rooms and pump rooms. IP20 protection rating designed for control cabinet installation, with suitable control cabinet can meet protection requirements of various ship areas. Vibration and shock performance meet marine environment requirements.
Standard DIN Rail Mounting, Easy Maintenance — Dimensions 355×158×87mm, weight 1.35kg, adopts 35mm standard DIN rail vertical mounting, simple and quick installation and removal, convenient for field maintenance and replacement. Modular design supports hot-swap (need to confirm system configuration), reducing maintenance downtime.
Multiple Classification Society Certifications, Globally Applicable — Passed type approval from major international classification societies such as DNV-GL, ABS (American Bureau of Shipping), LR (Lloyd's Register), BV (Bureau Veritas), etc. Products meet regulatory requirements of global classification societies, can be applied to ships and offshore platforms flying any flag, no additional certification required.
Kongsberg K-Chief System Original Factory Adaptation — Specifically designed for K-Chief series marine alarm monitoring and integrated control systems, perfectly compatible with RCU main controllers, operator workstations, database servers, etc., plug-and-play, no additional development and integration required, ensuring complete compatibility and optimal communication performance with K-Chief systems.
High Reliability and Long Life Design — Adopts industrial-grade components and solid-state channel design, no mechanical contact wear, long life. Life prediction: 38.5 years at 25°C environment (60% confidence), high MTBF, ensuring reliable operation throughout ship life cycle, reducing maintenance replacement frequency and life-cycle cost.

4. Typical Applications

Ship Engine Room Monitoring and Alarm System (MAS): Distributed signal acquisition unit in engine room area of K-Chief system, acquiring temperature, pressure, level, flow, speed, status and other signals of main engine, auxiliary engines, boilers, pumps, valves, heat exchangers and other equipment, 实现 monitoring, alarm and interlock protection
Ship Process Control System: Signal acquisition and control output for ship process systems such as cargo oil loading/unloading, ballast water, fuel oil transfer, cooling water, fire water, bilge water, etc., 实现 remote start/stop of pumps and valves, level control, flow regulation, process interlock, etc.
Ship Hazardous Area (Ex Zone 2) Signal Acquisition: Signal acquisition and control in Ex Zone 2 areas with explosive gas risk such as pump rooms, cargo hold perimeters, oil tank perimeters, fuel stations, etc., no additional explosion-proof isolation measures required
Offshore Platform Automation System: Remote I/O unit for K-Chief automation system on offshore drilling platforms, production platforms, FPSO, FSRU and other offshore facilities, monitoring and controlling platform production equipment, utility systems, safety systems, etc.
Ship Integrated Automation System (IAS): Integrated automation signal acquisition and control for whole ship areas including engine room, deck, cargo hold, accommodation, etc., 实现 centralized monitoring and control of whole ship equipment
Ship Dynamic Positioning System (DP): Signal acquisition and control interface unit for thrusters, steering gears, sensors and other equipment in dynamic positioning system, 实现 on-site signal processing for position keeping, heading control and other functions
Special Ship Automation: Remote I/O unit for automation systems on special ships such as research vessels, icebreakers, engineering vessels, naval auxiliary vessels, LNG carriers, chemical carriers, meeting monitoring and control requirements and hazardous area requirements of special ships
Ship Cargo Hold Monitoring: Temperature, humidity, level, pressure, gas concentration and other signal monitoring in cargo hold areas of bulk carriers, container ships, tankers, chemical carriers, etc., 实现 cargo hold environmental monitoring and alarm
Ship Deck Machinery Control: Control and status monitoring interface unit for deck machinery such as windlasses, winches, cranes, gangways, capstans, etc.
Ship Power Station Automation: Signal acquisition and control interface for generators, switchboards, loads and other equipment in ship power station system, 实现 power station automation management and load scheduling
Ship HVAC System: Temperature, humidity, air pressure, fan status, damper position and other signal monitoring and control for ship air conditioning and ventilation systems
Ship Safety System: Signal acquisition and alarm interface unit for safety systems such as fire alarm, combustible gas detection, flooding monitoring, smoke detection, etc. (need to confirm whether integrated with safety system)
New Shipbuilding Automation System Integration: Supporting remote I/O module for K-Chief automation system on newly built ships
Ship Automation System Upgrade and Retrofit: Remote I/O module replacement and expansion when upgrading old ship automation systems to K-Chief system

5. Model Explanation

Product Model: RMP420

Part No.: 306712 (reference, may vary by version/batch)

Product Description: Remote Multipurpose Input/Output Module, for K-Chief Alarm Monitoring and Integrated Control Systems

Model code breakdown:

RMP: Remote Multipurpose series code
420: Model code (400 series, 32-channel configuration)

Official Documentation:

RMP420-Remote Multipurpose Input/Output (Kongsberg official datasheet)
Manufacturer: Kongsberg Maritime AS, P.O. Box 483, NO-3001 Kongsberg, Norway

Key Parameters Summary:

表格

Parameter	Value
Channels	32 software-configurable multipurpose channels
AI Range	0-10V / 0-20mA
AI Accuracy	±0.15% FS
AO Range	0-10V / 0-20mA
AO Accuracy	±0.35% FS
Communication	Redundant RBUS (RS485, galvanic isolation)
Power Supply	24VDC (18-31.2V)
Dimensions	355×158×87mm
Weight	1.35kg
Operating Temperature	-15°C ~ +70°C
Explosion-proof	Ex Zone 2

Related Models in Same Series (reference):

表格

Model	Description
RMP420	Remote Multipurpose I/O Module (this product, 32 channels)
RMP422 (S)	Remote Multipurpose I/O Module (other version/configuration)
RCU502i	Remote Control Unit (main controller)
RCU602	Remote Control Unit (higher configuration)
RDIO401S	Remote Digital I/O Module
RDIO420S	Remote Digital I/O Module
RDIOR420	Remote Digital I/O Relay Output Module
RTB420	Remote Terminal Module
RHUB200-5	Remote Hub Module
RSER200-	Remote Serial Interface Module

Brand: Kongsberg Maritime AS, global leading marine automation and ocean technology company, headquartered in Kongsberg, Norway

6. Installation & Usage Instructions

Pre-Installation Preparation:

Confirm RMP420 model and part number match system requirements
Confirm required channel configuration (AI/AO/DI/DO/pulse) and field signal types
Prepare 24V DC power supply, RBUS bus cables, terminal blocks, signal cables, etc.
Prepare configuration tool (Kongsberg system configuration software and computer)
Read Kongsberg RMP420 installation manual and K-Chief system documentation

Installation Notes:

Installation and wiring must be performed in de-energized state, ensure safety
Wear anti-static wrist strap to avoid electrostatic damage to module circuit
RMP420 has IP20 protection rating, must be installed inside control cabinet, avoid direct exposure to humid, dusty, corrosive gas environments
If installed in Ex Zone 2 area, must use control cabinet and wiring method meeting explosion-proof requirements, follow explosion-proof installation specifications
Control cabinet should have appropriate protection rating and ventilation and heat dissipation conditions
Module adopts 35mm standard DIN rail vertical mounting, ensure clips are secure and module has good contact with rail
Leave appropriate heat dissipation space between modules (reference at least 10-20mm spacing)
Avoid installing module directly above heating elements (such as transformers, braking resistors)
Keep away from strong interference sources (such as frequency converters, transformers, contactors), or take shielding measures

Wiring Instructions:

Power Wiring: 24V DC power supply connected to power terminals, pay attention to positive and negative polarity, operating voltage range 18-31.2V
RBUS Bus Wiring: 2 9-pin male D-Sub connectors respectively connect to A line and B line of redundant RBUS, pay attention to RS485 A/B polarity, use shielded twisted pair, shield grounded at one end
Bus Termination Resistor: RBUS must have termination resistors at both ends (usually 120Ω), intermediate nodes do not connect
I/O Channel Wiring: According to channel configuration (AI/AO/DI/DO), correctly connect field sensors and actuators per module wiring diagram
- Analog input (4-20mA): use shielded twisted pair, shield grounded at one end, pay attention to current loop polarity
- Analog input (0-10V): use shielded cable, avoid parallel routing with power cables
- Analog output (0-20mA): pay attention to load resistance not less than 500Ω, avoid short circuit
- Analog output (0-10V): pay attention to output internal resistance 1kΩ, load impedance should be large enough
- Digital input: pay attention to input voltage range, passive contact or active signal wiring methods differ
- Digital output: solid-state output pay attention to load capacity, inductive loads need surge suppressors
Field Sensor Power Supply: If using module I/O power output to power sensors, pay attention to total current not exceeding module output capacity, and with short-circuit protection
All wiring terminals should be tight and reliable, avoid virtual connections
After wiring completion, check all wiring, confirm correct before power-on

Configuration & Commissioning:

Confirm all wiring is correct and module is installed in place
Turn on 24V DC power, observe module power indicator and status indicator
Connect to RMP420 via Kongsberg system configuration software (via RCU or dedicated configuration interface)
Configure module address, RBUS bus parameters, communication rate, etc.
Configure type (AI/AO/DI/DO/pulse), signal range, span, unit, alarm threshold, filtering parameters for each of 32 channels
For analog input channels, configure signal type (0-10V/0-20mA/4-20mA), engineering range, alarm upper/lower limits
For analog output channels, configure output type (0-10V/0-20mA), output range, initial value
Download configuration to RMP420
Test communication: confirm RMP420 communicates normally with RCU main controller, both redundant buses work normally
Test I/O channels: test analog input (inject standard signal to verify reading and accuracy), digital input (short contact to verify status), output channels (force output to verify action and accuracy) one by one
Test alarm and interlock functions: simulate alarm conditions, verify alarm reporting and interlock actions are correct
Test redundancy function: disconnect one RBUS, verify communication is not interrupted; after recovery verify automatic switch back
Save configuration file, make configuration backup
Record RMP420 installation location, address, channel configuration, I/O list and other information in system documentation

Maintenance Recommendations:

Regularly (recommended every 6-12 months) check RMP420 module operating status, indicator status
Regularly check wiring terminals for looseness, especially in areas with large vibration and Ex areas
Regularly check RBUS bus connectors and termination resistors are normal
Regularly backup system configuration files, avoid configuration loss
Recommended to stock 1-2 RMP420 modules as ship spare parts for quick replacement in case of failure
When module fails, can quickly recover by replacing spare part, faulty module returned to Kongsberg or authorized service provider for repair
Keep control cabinet clean, dry, well-ventilated, regularly clean dust
Avoid plugging/unplugging module while energized (unless hot-swap supported)
When upgrading K-Chief system software, confirm RMP420 firmware compatibility, upgrade module firmware if necessary
For modules installed in Ex Zone 2 areas, regularly check explosion-proof sealing and control cabinet integrity, ensure explosion-proof performance

Safety Notes:

Module operates at 24V DC safety voltage, but connected field equipment may be in high-voltage state (such as equipment controlled by relay output), pay attention to high-voltage hazard of related equipment during maintenance
Maintenance of modules installed in Ex Zone 2 areas must follow explosion-proof area safety operation regulations, necessary to apply for work permit
Maintenance of RMP420 involved in ship safety systems (such as fire alarm, flooding monitoring) must follow ship safety management regulations, notify captain and duty personnel if necessary
Wait for module to fully discharge after power-off before plugging/unplugging
Discarded electronic modules should be disposed of per ship garbage management regulations and e-waste regulations

7. Why Choose Us

Factory Order, Quality Guaranteed — All products sourced directly from Kongsberg Maritime factory or authorized channels, ensuring genuine originals with factory packaging, certificates, and quality documents, provides 12-month original factory warranty. Standard lead time 4-8 weeks, rush orders can be coordinated for expedited delivery.
Worldwide Delivery — Supports DHL, FedEx, UPS and other international couriers. Can also ship via your designated freight forwarder to 200+ countries, can arrange ship port delivery.
Professional Technical Support — Provides selection consultation (confirming K-Chief system compatibility, channel configuration requirements, part number confirmation, Ex area applicability), wiring guidance, configuration commissioning support, firmware upgrade recommendations, and fault diagnosis services, helping you correctly install and maintain marine automation systems.
Flexible Procurement — Supports single module procurement and bulk project orders, tiered pricing discounts with quantity. Can provide new shipbuilding project-specific quotations, ship spare part packages (RMP420 + related I/O modules + accessories combination), and annual spare part framework agreements.
Pre-shipment Inspection — Appearance check, packaging verification, model confirmation, and power-on test performed before shipment, ensuring delivered products are intact, model-accurate, and functional.

8. Frequently Asked Questions (FAQ)

Q1: Which marine automation systems is this RMP420 compatible with? Can my ship use it?

A: The RMP420 is mainly compatible with Kongsberg K-Chief series marine alarm monitoring and integrated control systems (such as K-Chief 500, K-Chief 600, K-Chief 700, etc.), serving as a remote multipurpose I/O module. Whether your ship can use it requires confirmation:

Whether the ship automation system is Kongsberg K-Chief series (or compatible K-Chief system)
Model of existing remote I/O modules in the system (whether RMP420/RMP422/RDIO series, etc.)
Whether the system software version supports RMP420
Type and quantity of I/O signals required (AI/AO/DI/DO/pulse)
Whether installation area is Ex Zone 2 (hazardous area)
Ship classification society requirements (product needs to pass corresponding classification society certification) It is recommended that you provide the ship automation system model, software version, existing I/O module model and part number, and we can assist in confirming compatibility. If your system is not K-Chief series, we can also recommend the corresponding system's remote I/O module model.

Q2: How many channels does RMP420 have? Can each channel be arbitrarily configured?

A: The RMP420 is equipped with 32 software-configurable multipurpose solid-state channels.

Regarding channel configuration:

Each channel can be configured via software as one of the following types:
- Analog Input (AI): 0-10V voltage or 0-20mA/4-20mA current
- Analog Output (AO): 0-10V voltage or 0-20mA current
- Digital Input (DI): switch/contact status
- Digital Output (DO): solid-state output
- Pulse/Frequency Interface: pulse counting or frequency measurement
Configuration is completed through Kongsberg system configuration software, no hardware replacement or jumper required
Channel configuration is flexible, can be arbitrarily combined according to field signal requirements, for example: 16 AI + 8 DI + 8 DO, or other combinations

Notes:

Specific configurable channel type combinations may be limited by module hardware (e.g., some channels may only be configurable as input or output), it is recommended to consult Kongsberg official datasheet for confirmation
Number of analog output channels may be limited (not all 32 channels can be configured as AO simultaneously)
It is recommended to provide a detailed I/O signal list before procurement, we can assist in confirming whether RMP420 meets requirements and how to reasonably configure channels

Q3: What is the analog accuracy of RMP420? Can it be used for custody transfer metering?

A: The analog accuracy of RMP420 is as follows:

Analog Input (AI): ±0.15% Full Scale (FS)
Analog Output (AO): ±0.35% Full Scale (FS), voltage output ±0.5%

Regarding custody transfer metering:

±0.15% analog input accuracy is relatively high in industrial process monitoring and control, can meet most ship process monitoring (temperature, pressure, level, flow, etc.) and control requirements
But for custody transfer metering, such as cargo oil loading/unloading metering, fuel bunkering metering, LNG trade metering, etc., usually requires higher accuracy (such as ±0.1% or higher) and specialized metering certification (such as OIML, API, MPDS, etc.)
The RMP420 is a general-purpose I/O module, not certified for custody transfer metering, not recommended for direct use in custody transfer metering
For custody transfer metering applications, it is recommended to use specially certified flow meters and metering systems (such as Kongsberg cargo oil metering system, fuel metering system, etc.), RMP420 can be used for monitoring and display, but not as legal metering basis for custody transfer
If your application is conventional process monitoring and control (non-custody transfer), RMP420 accuracy fully meets requirements

Q4: Can RMP420 be used in Ex Zone 2 hazardous areas? What to note?

A: Yes, the RMP420 is approved for Ex Zone 2 applications.

Ex Zone 2 definition:

Zone 2 refers to areas where explosive gas atmospherers occasionally occur and exist for short periods (unlikely to occur in normal operation, even if occurs only for short duration)
Typical Zone 2 areas on ships include: pump rooms, cargo hold perimeters, oil tank perimeters, fuel stations, battery rooms (part), paint rooms (part), etc.

Installation and usage notes:

Control cabinet requirements: RMP420 itself is IP20 module-level protection, when installed in Ex Zone 2, must use control cabinet meeting explosion-proof requirements (such as Ex e increased safety or Ex d flameproof control cabinet), ensure control cabinet explosion-proof rating and protection rating meet Zone 2 requirements
Wiring requirements: All wiring entering/exiting hazardous area must use explosion-proof cable glands, cables must meet explosion-proof requirements, wiring must follow explosion-proof installation specifications
Sealing requirements: All openings and wiring ports of control cabinet must be sealed, ensure explosion-proof performance
Maintenance requirements: When performing maintenance operations in Ex Zone 2 areas, must follow explosion-proof area safety operation regulations:
- Apply for work permit
- Perform combustible gas detection (Gas Test), confirm environment safe
- Take isolation, ventilation and other safety measures if necessary
- Use explosion-proof tools
No live opening: Strictly prohibit opening explosion-proof control cabinet while energized, must power off and confirm safety before opening
Regular inspection: Regularly inspect explosion-proof control cabinet sealing, cable glands, grounding, etc., ensure explosion-proof performance intact
Documentation: Equipment installation, inspection, maintenance in Ex areas must be recorded, for classification society and Port State Control (PSC) inspection

Note: RMP420 is only approved for Zone 2, must not be used in Zone 0 or Zone 1 (areas where explosive gas atmospherers persist or frequently occur). If your application area is Zone 0 or Zone 1, need to use equipment with higher explosion-proof rating or take other explosion-proof measures (such as intrinsically safe isolation).

Q5: Is this product in stock? What is the lead time? What is the price?

A: This model is currently in order available status, standard lead time 4-8 weeks (ordered from Kongsberg Maritime factory or allocated from global inventory). The RMP420 is a dedicated marine automation spare part, with limited stock inventory, usually requiring production to order or allocation from global inventory.

Price: Specific price subject to our formal quotation, bulk procurement can enjoy tiered discounts. This product is a Kongsberg marine automation dedicated multipurpose I/O module, price is higher than ordinary industrial I/O modules.
Expedited service: If you have urgent needs (such as ship failure in port, tight shipping schedule, PSC inspection deficiency rectification), we can try to coordinate global stock inventory or expedited ordering, specific please contact our sales team.
Used/refurbished: Some suppliers may provide used or refurbished RMP420, lower price but no quality and warranty guarantee, and may affect classification society certification. We recommend prioritizing Kongsberg original new products to ensure ship safety and system stability, especially for equipment used in Ex Zone 2 areas.
Please indicate required quantity, ship model, installation area (whether Ex area), desired delivery time, and destination port when inquiring, we will do our best to coordinate the fastest delivery solution and optimal price.

Q6: What is the difference between RMP420, RCU502I, and RCU602? How do they work together?

A: RMP420, RCU502I, RCU602 are all components of Kongsberg K-Chief marine automation system, but differ in function and positioning:

表格

Comparison Item	RMP420	RCU502I	RCU602
Type	Remote Multipurpose I/O Module	Remote Control Unit	Remote Control Unit
Main Function	Field signal acquisition and control output	Control processing, I/O expansion, communication	High-performance control processing, I/O expansion, communication
Channels	32 configurable multipurpose channels	Up to 32 channels via expansion modules	More I/O expansion capability
Processing Capability	Signal processing, no complex control logic	Embedded processor, can execute control logic	Higher performance processor, stronger control capability
Communication	Redundant RBUS (slave)	Dual redundant CAN bus (master) + RBUS	Dual redundant CAN bus + more interfaces
Explosion-proof	Ex Zone 2	To be confirmed	To be confirmed
Positioning	Distributed field I/O node	Area controller/small control station	Main controller/large control station

How they work together:

RCU (Main Controller): Serves as area control unit, responsible for control logic execution, data processing, communication with operator stations, connects to system central equipment via CAN bus
RMP420 (Remote I/O): Serves as distributed field I/O node, installed near field equipment, connects to RCU via redundant RBUS, responsible for field signal acquisition and control output
Typical architecture: Operator Workstation ↔ Central Server ↔ CAN Bus ↔ RCU502I/RCU602 ↔ RBUS ↔ RMP420 ↔ Field Sensors/Actuators
Advantages: Distributed I/O architecture reduces field wiring quantity, improves system reliability, facilitates expansion and maintenance

How to choose:

If only need field signal acquisition and control output, and already have RCU main controller → choose RMP420
If need a small area controller with 少量 I/O → choose RCU502I
If need high-performance main controller with 大量 I/O and complex control logic → choose RCU602
Large systems are usually a combination of RCU + multiple RMP420

Q7: How to judge and replace a faulty RMP420? Does it need reconfiguration?

A: Fault judgment methods:

Indicator Status: Observe power indicator, running indicator, communication indicator, fault indicator on the RMP420 module. Under normal status, power light is on, running light normal, communication light flashes; if power light is off may be power failure, if fault light is on may be hardware failure
System Alarm: K-Chief operator workstation will display RMP module communication fault, I/O channel fault, hardware fault and other alarm information, can locate to specific module and channel
I/O Data Abnormality: All I/O channel data under a certain RMP420 simultaneously abnormal or lost, may be module fault or communication fault; single channel abnormality may be field sensor/actuator fault or channel configuration problem
Redundancy Switching: When one bus in redundant RBUS fails, system will alarm, but communication is not interrupted; if both buses fail, all signals under this RMP are lost
Multimeter Measurement: Measure whether 24V power input is normal, whether RBUS signal is normal, determine whether it is power problem, bus problem, or module itself fault

Replacement steps:

Notify duty personnel and captain (if 涉及 safety system), explain that module replacement will be performed
If this RMP controls critical equipment, first switch related equipment to local control or manual control
Disconnect RMP420 24V power supply
Wait for module to fully discharge
Mark all wiring positions (or take photos for record)
Pull out faulty module (press DIN rail clip to remove)
Insert new module, ensure clip is secure
Restore wiring (per marks or photos)
Restore 24V power supply
Observe module indicators, confirm normal startup

Regarding reconfiguration:

If replacing with the same model (RMP420), and system configuration is stored in RCU main controller: Usually no reconfiguration required, new module will automatically download configuration from RCU after power-on, plug-and-play
If module firmware version is incompatible with system: May need to upgrade or downgrade module firmware
If replacing with different model or channel configuration changes: Need to reconfigure channel parameters in system configuration software and download
Recommendation: After replacement, test all I/O channels and communication functions, confirm normal before restoring system operation
Regularly backup system configuration files, ensure configuration can be quickly restored after module replacement