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Kongsberg RDIOR420 Remote Digital I/O & Relay Module | 306713 | 32 Channels | 16 Configurable Solid-State DI/DO + 16 Relay NC/NO | Redundant RBUS | 24VDC | K-Chief Marine Automation | Order Available

Original Kongsberg Maritime RDIOR420 (part no. 306713) Remote Digital Input/Output and Relay Module, specifically designed for K-Chief series marine automation systems. Total 32 I/O channels: 16 individually configurable solid-state channels (configurable as digital input DI or digital output DO) + 16 relay channels (NC normally closed / NO normally open, potential-free contacts). Communicates with RCU main controller via redundant RBUS I/O process bus (2×9-pin D-Sub, RS485, galvanic isolation).

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Product Details

1. Product Overview

The Kongsberg RDIOR420 (part no. 306713) is a Remote Digital Input/Output and Relay Module manufactured by Kongsberg Maritime AS of Norway, and is a core distributed digital I/O unit in the K-Chief series marine automation systems. This module is designed for digital signal acquisition and relay control output on ships, communicating with the RCU main controller via redundant I/O process bus (RBUS), enabling equipment status acquisition, pump/valve control, alarm indication, interlock protection and other functions in various ship areas.

The RDIOR420 is equipped with a total of 32 I/O channels, divided into two categories:

16 individually configurable solid-state channels: Each channel can be independently configured via software as digital input (DI) or digital output (DO), using solid-state output (no mechanical contacts), fast response, long life, no contact wear, suitable for high-frequency switching signals and status indication outputs.
16 relay channels: Each relay channel provides NC (normally closed) and NO (normally open) potential-free contacts, electrically isolated, can directly drive field devices such as pumps, valves, contactors, alarms, etc., supports DC 15-300V/5A and AC 15-250V/2A loads, adapting to various ship control load requirements.

In terms of communication, the RDIOR420 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 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.

The RDIOR420 is powered by 24V DC, with operating voltage range 18-31.2V, typical power consumption 8W, adapting to ship power grid voltage fluctuations. Power and I/O wiring both use screw terminals, supporting 2.5mm² cables, maximum torque 0.4-0.5Nm, secure and reliable wiring. Operating temperature range is -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. Protection rating is IP20 (module level), designed for installation in control cabinets, dimensions 355×158×87mm, weight 1.35kg, adopts standard DIN rail mounting, easy installation and maintenance.

This module is certified by major classification societies such as DNV-GL, ABS, LR, BV, etc. (reference same series products), 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	RDIOR420
Part No.	306713 (reference, may vary by version)
Product Type	Remote Digital Input/Output and Relay Module
Applicable System	K-Chief series marine automation systems (K-Chief 500/600/700, etc.)
Total I/O Channels	32
Solid-State Channels	16, individually configurable as digital input (DI) or digital output (DO)
Relay Channels	16, NC (normally closed) / NO (normally open) potential-free contacts
Digital Input (DI)	To be confirmed (reference 24V DC, opto-isolated)
Solid-State Digital Output (DO)	To be confirmed (reference solid-state output, max current depends on load)
Relay Contact Form	NC / NO (SPDT, reference)
Relay DC Load	15 - 300 V DC, min 100mA, max 5A (Cos φ=1)
Relay AC Load	15 - 250 V AC, recommended max 2A (Cos φ=0.4)
Relay Breaking Capacity	0.1A: 300V, 0.3A: 60V, 5A: 24V
Relay Electrical Isolation	Contacts electrically isolated from control circuit
Relay Mechanical Life	To be confirmed (reference > 10^7 operations, light load)
Communication Interface	Redundant RBUS I/O process bus, 2×9-pin male D-Sub connectors
Communication Type	RS485, Galvanic Isolation
Communication Redundancy	Dual bus redundancy, automatic failover
Supply Voltage	24 V DC (nominal), operating range 18 - 31.2 V DC
Typical Power Consumption	8 W
Max Power Consumption	To be confirmed (depends on I/O configuration and load)
Loop Power Output	Configuration dependent (can power field sensors/devices)
Power Connectors	Screw terminals, cable cross-section 2.5 mm², max torque 0.4-0.5 Nm
I/O Connectors	Screw terminals (specific specifications to be confirmed)
Operating Temperature	-15°C ~ +70°C
Storage Temperature	-25°C ~ +70°C
Humidity	Up to 98% RH (operating/storage, non-condensing)
Protection Degree	IP20 (IEC 60529, module level)
Classification Society Certification	DNV-GL, ABS, LR, BV (complete list to be confirmed)
EMC Standard	To be confirmed (reference complies with marine EMC related standard IEC 60533)
Vibration & Shock	To be confirmed (meets marine environment requirements)
Dimensions (H×W×D)	355 × 158 × 87 mm
Weight	1.35 kg
Mounting Method	Standard DIN rail mounting (35mm)
Configuration Tool	Kongsberg system configuration software
Self-Diagnostic Function	Channel status monitoring, communication monitoring, power monitoring, relay fault monitoring (specific functions 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 Hybrid I/O Architecture — Total 32 I/O channels, including 16 individually configurable solid-state DI/DO channels and 16 relay NC/NO channels, one module simultaneously meets digital signal acquisition and relay control output requirements, reduces module types and control cabinet space, lowers system configuration complexity and spare part cost.
16 Configurable Solid-State DI/DO — 16 solid-state channels can be individually configured via software as digital input or digital output, no hardware replacement or jumper required to flexibly adapt to field signal requirement changes. Solid-state output has no mechanical contact wear, fast response, long life, high reliability, suitable for high-frequency switching signals and status indication outputs.
16 Relay NC/NO Outputs — 16 relay channels provide NC (normally closed) and NO (normally open) potential-free contacts, electrically isolated, can directly drive field devices such as pumps, valves, contactors, alarms, indicators, etc. Supports DC 15-300V/5A and AC 15-250V/2A loads, strong breaking capacity, adapts to various ship control load requirements, no additional intermediate relays required.
Redundant RBUS Communication — Communicates with RCU main controller via redundant RBUS I/O process bus, 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 and seamlessly takes over, communication is not interrupted, meeting high reliability requirements of critical ship monitoring and control systems.
24VDC Wide Voltage Power Supply and Low Power Consumption — 24V DC power supply, operating voltage range 18-31.2V, adapting to ship power grid voltage fluctuations and drops. Typical power consumption only 8W, low heat generation, suitable for dense installation in control cabinets, reduces heat dissipation requirements. Power and I/O both use screw terminal wiring, supporting 2.5mm² cables, secure and reliable wiring.
Marine-Grade Wide Temperature Range and High Humidity 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, same size as same series modules such as RMP420, RCU602, adopts 35mm standard DIN rail 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.
Comprehensive Self-Diagnostic and Channel Monitoring — Has comprehensive self-diagnostic functions, can real-time monitor I/O channel status, communication status, power status, and relay faults, fault information automatically reported to central system and displayed on operator station, facilitating crew quick fault location and maintenance, reducing fault troubleshooting time.
K-Chief System Original Factory Adaptation — Specifically designed for K-Chief series marine automation 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.
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.

4. Typical Applications

Ship Engine Room Monitoring and Alarm System (MAS): Distributed digital signal acquisition and relay control unit in engine room area of K-Chief system, acquiring operating status, fault alarm, level switch, pressure switch and other digital signals of pumps, valves, filters, heat exchangers and other equipment, outputting alarm indication, pump/valve start/stop control, interlock protection and other relay signals
Ship Pump and Valve Control System: Remote start/stop control and status feedback acquisition of various ship pumps (bilge pump, ballast pump, fire pump, fuel pump, lubricating oil pump, cooling water pump, etc.) and valves (butterfly valve, gate valve, solenoid valve, etc.), 实现 remote control and interlock protection of pumps and valves
Ship Switchboard Monitoring and Control: Switch status acquisition, fault alarm indication, load switching control, etc. of ship main switchboard, emergency switchboard, distribution boxes, 实现 power station automation and load management
Ship Alarm Indication System: Indicator light control, alarm bell control, alarm extension output, etc. of ship general alarm, engineer alarm, fire alarm, combustible gas alarm, flooding alarm and other alarm systems
Ship Interlock Protection System: Interlock protection logic output of critical ship equipment, such as main engine interlock, boiler interlock, pump/valve interlock, fire damper interlock, etc., ensuring equipment and personnel safety
Ship Deck Machinery Control: Status acquisition and control output interface unit for deck machinery such as windlasses, winches, cranes, gangways, capstans, lifeboat davits, etc.
Ship HVAC System Control: Fan start/stop control, damper control, filter status monitoring, temperature switch acquisition, etc. of ship air conditioning and ventilation systems
Ship Cargo Hold Monitoring: Level switch, temperature switch, smoke detection, flooding detection and other digital signal acquisition and alarm output in cargo hold areas of bulk carriers, container ships, tankers, etc.
Offshore Platform Automation System: Remote digital 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.
Special Ship Automation: Remote digital I/O module 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 of special ships
Ship Safety System Interface: Signal acquisition and alarm output 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 digital I/O module for K-Chief automation system on newly built ships
Ship Automation System Upgrade and Retrofit: Remote digital I/O module replacement and expansion when upgrading old ship automation systems to K-Chief system

5. Model Explanation

Product Model: RDIOR420

Part No.: 306713 (reference, may vary by version/batch)

Product Description: Remote Digital Input/Output and Relay Module, for K-Chief Marine Automation Systems

Model code breakdown:

RDIO: Remote Digital Input/Output series code
R: Relay identifier, indicating this model integrates relay output
420: Model code (400 series, 32-channel configuration)

Official Documentation:

RDIOR420-Remote Digital Input/Output and relay (Kongsberg official datasheet)
Manufacturer: Kongsberg Maritime AS, P.O. Box 483, NO-3001 Kongsberg, Norway

Key Parameters Summary:

表格

Parameter	Value
Total Channels	32
Solid-State DI/DO Channels	16 (individually configurable)
Relay Channels	16 (NC/NO)
Relay DC Load	15-300VDC / 5A
Relay AC Load	15-250VAC / 2A
Communication	Redundant RBUS (RS485, galvanic isolation)
Power Supply	24VDC (18-31.2V)
Typical Power Consumption	8W
Dimensions	355×158×87mm
Weight	1.35kg
Operating Temperature	-15°C ~ +70°C
Protection Degree	IP20

Related Models in Same Series (reference):

表格

Model	Description
RDIOR420	Remote Digital I/O and Relay Module (this product, 16 solid-state DI/DO + 16 relays)
RDIOR420S	Remote Digital I/O and Relay Module (S version, may differ)
RDIO401S	Remote Digital I/O Module
RDIO420S	Remote Digital I/O Module
RMP420	Remote Multipurpose I/O Module (32 configurable AI/AO/DI/DO/pulse)
RCU502i	Remote Control Unit (main controller)
RCU602	Remote Control Unit (higher configuration)
RTB420	Remote Terminal Module
RHUB200-5	Remote Hub 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 RDIOR420 model and part number match system requirements
Confirm required channel configuration (DI/DO/relay) 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 RDIOR420 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
RDIOR420 has IP20 protection rating, must be installed inside control cabinet, avoid direct exposure to humid, dusty, corrosive gas environments
Control cabinet should have appropriate protection rating and ventilation and heat dissipation conditions
Module adopts 35mm standard DIN rail 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, high-power relays)
Keep away from strong interference sources (such as frequency converters, transformers, contactors), or take shielding measures
When relay output controls inductive loads (such as contactor coils, solenoid valves), must install surge suppressor (freewheeling diode or RC snubber) to protect relay contacts

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, use 2.5mm² cable, torque 0.4-0.5Nm
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
Digital Input (DI) Wiring: According to input voltage range (reference 24V DC), correctly connect field passive contacts or active signals, pay attention to common terminal wiring
Solid-State Digital Output (DO) Wiring: Pay attention to output type (NPN/PNP) and max current, load current not exceeding rated value, inductive loads install surge suppressor
Relay Output Wiring:
- NC (normally closed) and NO (normally open) contacts selected according to control requirements
- DC load: 15-300V DC, max 5A (Cos φ=1)
- AC load: 15-250V AC, recommended max 2A (Cos φ=0.4)
- Inductive loads (contactors, solenoid valves) must install surge suppressor
- Pay attention to relay contact capacity, avoid overload causing contact damage
- Relay contacts are potential-free, need to connect external power supply according to load requirements
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 RDIOR420 via Kongsberg system configuration software (via RCU or dedicated configuration interface)
Configure module address, RBUS bus parameters, communication rate, etc.
Configure direction (DI or DO), signal type, filtering parameters, alarm threshold, etc. for 16 solid-state channels
Configure initial state (energized/de-energized), interlock logic, alarm association, etc. for 16 relay channels
Download configuration to RDIOR420
Test communication: confirm RDIOR420 communicates normally with RCU main controller, both redundant buses work normally
Test DI channels: short contacts or apply signals one by one, verify status acquisition correct
Test DO channels: force output one by one, verify solid-state output action correct
Test relay channels: force relay action one by one, verify NC/NO contact switching correct, measure contact on/off
Test alarm and interlock functions: simulate alarm conditions, verify alarm reporting and relay interlock actions 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 RDIOR420 installation location, address, channel configuration, I/O list and other information in system documentation

Maintenance Recommendations:

Regularly (recommended every 6-12 months) check RDIOR420 module operating status, indicator status
Regularly check wiring terminals for looseness, especially in areas with large vibration and relay output terminals
Regularly check RBUS bus connectors and termination resistors are normal
Regularly backup system configuration files, avoid configuration loss
Recommended to stock 1-2 RDIOR420 modules as ship spare parts for quick replacement in case of failure
Relay contacts have mechanical life, frequently operated relay channels should be regularly checked for contact status, replace module if necessary
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 RDIOR420 firmware compatibility, upgrade module firmware if necessary

Safety Notes:

Module operates at 24V DC safety voltage, but field equipment controlled by relay output may be in high-voltage state (such as AC 220V/380V contactors, solenoid valves), pay attention to high-voltage hazard of related equipment during maintenance
Maintenance of RDIOR420 involved in ship safety systems (such as fire alarm, flooding monitoring, general alarm) 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
When replacing relay-controlled loads, must disconnect load-side power supply to avoid electric shock
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, relay load matching), 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 (RDIOR420 + 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 (relay action test, channel status 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 RDIOR420 compatible with? Can my ship use it?

A: The RDIOR420 is mainly compatible with Kongsberg K-Chief series marine automation systems (such as K-Chief 500, K-Chief 600, K-Chief 700, etc.), serving as a remote digital input/output and relay 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 RDIOR420/RDIO401S/RDIO420S/RMP420, etc.)
Whether the system software version supports RDIOR420
Number of digital signals required (DI/DO) and relay control outputs
Load type and capacity of relay-controlled loads (DC/AC, voltage, current)
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 RDIOR420 have? What is the difference between solid-state channels and relay channels?

A: The RDIOR420 has a total of 32 I/O channels, divided into two categories:

16 Solid-State Channels (configurable DI/DO):

Each channel can be independently configured via software as digital input (DI) or digital output (DO)
Uses solid-state output (transistor/opto-coupler), no mechanical contacts
Advantages: fast response (microsecond level), no mechanical wear, long life (theoretically unlimited), no contact bounce, high reliability
Disadvantages: output current is small, usually can only control low-voltage low-power loads, cannot directly control AC 220V equipment
Application: status indication, LED indicators, low-power DC loads, high-frequency switching signals, PLC signal interaction

16 Relay Channels (NC/NO):

Each channel provides NC (normally closed) and NO (normally open) potential-free contacts
Uses mechanical relays, has physical contacts
Advantages: large contact capacity (DC 15-300V/5A, AC 15-250V/2A), electrical isolation, can control AC and DC loads, potential-free contacts flexible
Disadvantages: has mechanical life (reference >10^7 operations light load), slower response (millisecond level), has contact bounce, frequent operation causes wear
Application: direct control of field devices such as pumps, valves, contactors, alarms, alarm bells, indicators, etc.

How to choose:

Need to acquire switch status → configure as DI
Need to control low-power DC loads or high-frequency signals → configure as solid-state DO
Need to control pumps, valves, contactors, AC loads → use relay channels
One RDIOR420 module can simultaneously meet digital signal acquisition and relay control requirements, no need to purchase DI module and relay output module separately

Q3: Can relay output directly control 220V AC contactors? What to note?

A: Yes, the relay output of RDIOR420 can directly control 220V AC contactors, but need to note the following:

Load capacity confirmation:

AC load range: 15 - 250 V AC
Recommended max current: 2A (Cos φ=0.4, inductive load)
Ordinary 220V AC contactor coil power is usually 5-30VA, current about 0.02-0.14A, far below 2A rated value, so can be directly controlled
But if it is a large-capacity contactor (coil power > 500VA), current may exceed 2A, at this time need to transfer through intermediate relay

Must note:

Inductive load surge suppression: Contactor coils, solenoid valves and other inductive loads generate high reverse EMF (up to hundreds to thousands of volts) at the moment of disconnection, which will seriously damage relay contacts. Must connect surge suppressor in parallel across contactor coil:
- AC load: parallel RC snubber (resistor-capacitor snubber) or varistor (MOV)
- DC load: parallel freewheeling diode (pay attention to polarity)
Contact capacity margin: Actual load current recommended not exceeding 50-70% of rated value, leave margin, extend contact life
Relay contacts are potential-free: RDIOR420 relay contacts themselves are not energized, need to connect 220V AC external power supply according to load requirements, pay attention to live and neutral wires when wiring
NC/NO selection: Select normally closed (NC) or normally open (NO) contacts according to control logic. Safety interlocks usually use NC contacts (de-energized trigger), normal control usually uses NO contacts (energized action)
Frequent operation limitation: Relays have mechanical life, frequent operation (such as dozens of times per minute) will accelerate contact wear. For high-frequency switching applications, recommended to use solid-state output channels or external solid-state relays
Breaking capacity: Relay breaking capacity is related to load voltage and current (0.1A:300V, 0.3A:60V, 5A:24V), actual breaking load should be within breaking capacity range
Regular inspection: Frequently operated relays should be regularly checked for contact status (burning, sticking), replace module if necessary

Q4: What is the difference between RDIOR420 and RMP420? How to choose?

A: RDIOR420 and RMP420 are both remote I/O modules for Kongsberg K-Chief system, but differ in function and positioning:

表格

Comparison Item	RDIOR420	RMP420
Type	Remote Digital I/O and Relay Module	Remote Multipurpose I/O Module
Channels	32	32
Channel Types	16 solid-state DI/DO + 16 relay NC/NO	32 configurable multipurpose channels (AI/AO/DI/DO/pulse)
Analog Input	Not supported	Supported (0-10V/0-20mA, accuracy ±0.15%FS)
Analog Output	Not supported	Supported (0-10V/0-20mA, accuracy ±0.35%FS)
Relay Output	16 channels (NC/NO, high capacity)	No dedicated relay output (DO is solid-state)
Solid-State DI/DO	16 configurable channels	Configurable as DI/DO
Pulse/Frequency	Not supported	Supported
Typical Power Consumption	8W	10W
Dimensions/Weight	355×158×87mm / 1.35kg	355×158×87mm / 1.35kg
Positioning	Digital signal acquisition + relay control	General analog + digital multipurpose acquisition and control
Price	Relatively lower (reference)	Relatively higher (reference)

How to choose:

Choose RDIOR420: If field signals are mainly digital (switch status, start/stop feedback) and relay control outputs (pump/valve control, alarm output), no analog signal acquisition and output required
Choose RMP420: If need to acquire analog signals (4-20mA signals of temperature, pressure, level, flow) or need analog output (control control valves)
Combined use: Large systems are usually a combination of RMP420 (analog acquisition) + RDIOR420 (digital + relay control), reasonably configured according to field signal types
It is recommended to provide a detailed I/O signal list (AI/AO/DI/DO/relay quantity) before procurement, we can assist in configuring the optimal module combination

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 RDIOR420 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 digital I/O and relay 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 RDIOR420, lower price but no quality and warranty guarantee, and relay contacts may already be worn, affecting reliability. We recommend prioritizing Kongsberg original new products to ensure ship safety and system stability.
Please indicate required quantity, ship model, installation area, desired delivery time, and destination port when inquiring, we will do our best to coordinate the fastest delivery solution and optimal price.

Q6: How to judge and replace a faulty RDIOR420? Can relay contacts be replaced individually?

A: Fault judgment methods:

Indicator Status: Observe power indicator, running indicator, communication indicator, fault indicator on the RDIOR420 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 RDIOR 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 RDIOR420 simultaneously abnormal or lost, may be module fault or communication fault; single channel abnormality may be field equipment fault, wiring fault or channel damage
Relay not operating: After forcing relay output, measure NC/NO contacts not switching, may be relay coil damaged or contacts sticking/burned
Multimeter Measurement: Measure whether 24V power input is normal, whether RBUS signal is normal, whether relay coil has voltage, whether contacts on/off 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 module controls critical equipment, first switch related equipment to local control or manual control
Disconnect RDIOR420 24V power supply
Wait for module to fully discharge
Mark all wiring positions (or take photos for record), especially live and neutral wires of relay outputs
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
Download configuration (if needed), test all channels and relays

Regarding whether relay contacts can be replaced individually:

Cannot be replaced individually. The 16 relays of RDIOR420 are integrated inside the module, soldered to the main board, cannot replace a single relay individually. If a relay contact is damaged (sticking, burning, poor contact), need to replace the entire RDIOR420 module.
This is because:
1. Relays are surface-mount or soldered on PCB, not modular design
2. Individually replacing relays requires professional soldering equipment and skills, and may damage PCB
3. After replacement cannot guarantee overall module performance and certification (classification society certification)
4. Ship sites usually do not have individual repair conditions
Recommendation: Stock complete RDIOR420 modules as spare parts, replace as a whole when faulty. Faulty modules can be returned to Kongsberg or authorized service provider for professional repair (such as relay replacement and testing).
Methods to extend relay life:
1. Inductive loads must install surge suppressor
2. Load current not exceeding 50-70% of rated value
3. Avoid frequent operation (high-frequency switching use solid-state output)
4. Regularly check contact status

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