Description
Product Overview
The Kongsberg RDIO420S Remote Digital Input/Output Module is a marine automation I/O module designed for distributed control and monitoring applications. It interfaces field devices with a compatible Kongsberg control system, supporting digital signal acquisition and output control in shipboard automation and safety-related installations.
The RDIO420S is designed for applications requiring configurable digital I/O channels, remote communication with the host controller, and monitoring of field signals. It is a specialized version intended for safety-related system architectures, so its configuration and approved application must be verified before use.
The RDIO420S is distinct from the RDIOR420 module, which includes relay channels. Do not assume the two models are interchangeable simply because their names are similar.

Kongsberg RDIO420S
Key Features
- Marine Automation Application: Designed for compatible Kongsberg distributed control systems.
- Remote Digital I/O: Supports digital signal interfacing between field devices and the host controller.
- Configurable Channels: Solid-state channels can be configured as digital inputs or digital outputs, subject to the module configuration.
- Remote Bus Communication: Uses the Kongsberg remote I/O process bus architecture.
- Safety-System Variant: Intended for specific safety-related applications; verify system approval and configuration requirements.
- Field Signal Monitoring: Supports diagnostic monitoring of I/O channels.
- Legacy System Maintenance: Potential spare for existing installations using the exact RDIO420S configuration.
Datasheet
| Parameter | Details |
|---|---|
| Brand | Kongsberg |
| Model | RDIO420S |
| Part Number | 316564 |
| Product Name | Remote Digital Input/Output Module |
| Product Type | Remote Digital I/O Module |
| Application | Marine automation and safety-related control systems |
| Digital I/O Channels | 32 configurable digital channels, according to RDIO420S documentation |
| Channel Configuration | Digital input or digital output, depending on configuration |
| Communication Interface | Remote I/O process bus (RBUS) |
| Supply Voltage | 24 V DC nominal; verify exact operating range for the unit revision |
| Power Consumption | Not confirmed for this exact revision |
| Output Type | Solid-state digital output; verify load limits in the applicable manual |
| Dimensions | Not confirmed for the exact unit revision |
| Weight | Not confirmed for the exact unit revision |
| Place of Manufacture / Origin | Norway is associated with Kongsberg Maritime; specific unit origin not confirmed |
| Product Status | Used condition stated in the supplied listing; seller describes it as tested |
| Discontinued | Current lifecycle status not confirmed |
Frequently Asked Questions
Q1: What is the Kongsberg RDIO420S?
A: It is a remote digital input/output module used in compatible Kongsberg marine automation and safety-related control systems.
Q2: What is the module used for?
A: It interfaces digital field signals with a host controller for monitoring and control applications.
Q3: How many I/O channels does it support?
A: RDIO420S documentation describes 32 digital channels configurable as inputs or outputs. Confirm the specific module version and system configuration before use.
Q4: What power supply does it require?
A: The module uses a nominal 24 V DC supply. Check the nameplate and applicable hardware manual for the exact permitted range.
Q5: Is RDIO420S the same as RDIOR420?
A: No. The RDIOR420 combines configurable solid-state channels with dedicated relay channels. The RDIO420S is a different module variant designed for specific system applications.
Q6: Can it be used in any Kongsberg K-Chief system?
A: Compatibility depends on the host system generation, remote I/O bus, hardware revision, and safety architecture. Confirm the system documentation before installation.
Q7: What should be checked before ordering?
A: Verify the part number 316564, revision marking, connector arrangement, supply requirements, and the original system’s approved module configuration.
Q8: Can this module be installed without configuration?
A: Not necessarily. Address settings, I/O channel configuration, controller configuration, and functional testing may be required. Follow the applicable Kongsberg procedures.
Related Products and Equipment Categories
The following are related Kongsberg marine automation modules and sourcing references. They are not guaranteed direct replacements for the RDIO420S.
- Kongsberg RDIOR420 — Remote Digital I/O and Relay Module
- Kongsberg RDIO420 — Remote Digital Input/Output Module
- Kongsberg RMP420 — Remote Multipurpose I/O Module
- Kongsberg RMP422i — Remote Multipurpose Input Module
- Kongsberg RMP422Si — Safety-Related Remote Multipurpose Input Module
- Kongsberg RHUB200-4 — Remote I/O Hub
- Kongsberg RHUB200-5 — Remote I/O Hub
- Kongsberg RCU — Remote Control Unit
- Kongsberg K-Chief Automation System
- Kongsberg Digital Input Modules
- Kongsberg Digital Output Modules
- Kongsberg Relay Output Modules
- Kongsberg Remote I/O Process Bus Components
- Kongsberg Marine Safety System I/O Modules
- Kongsberg Distributed Control System Components
Always match the complete part number, revision, and system requirements before selecting a related module as a replacement.



