Kongsberg RDIOR420 306713 Remote I/O Relay Module Rev 1.3.1

Kongsberg RDIOR420 Remote Digital Input/Output and Relay Module (P/N: 306713, Rev 1.3.1)

The Kongsberg RDIOR420 (Part Number: 306713, Hardware Revision 1.3.1) is an industrial-grade marine remote input/output and interposing relay module engineered for harsh offshore and shipboard environments. Designed as a distributed process node for Kongsberg Maritime Remote Control Units (RCUs), the RDIOR420 aggregates discrete field instrumentation into dual-redundant serial process fieldbuses.

Equipped with 32 physical I/O channels, the module combines 16 software-configurable solid-state digital input/output (DI/DO) channels with 16 electromechanical relay output channels (dry contact, supporting both NO and NC topologies). Revision 1.3.1 integrates onboard loop resistance monitoring, open-circuit/short-circuit line-fault detection, comprehensive watchdog supervision, and deterministic hardware/software fail-safe fallbacks compliant with marine classification society automation standards.

Model Details

• Manufacturer: Kongsberg Maritime AS
• Model Type: RDIOR420 (Remote Digital Input/Output Relay Series 400/420)
• Manufacturer Part Number (MPN / KM Article No.): 306713
• Hardware Revision: Rev 1.3.1
• Documentation Reference: Kongsberg Document 312745 / Technical Manual RDIOR420

Technical Specifications

Key Features

1. Hybrid 32-Channel Field Density: Incorporates 16 solid-state channels independently configurable via software as DI or DO, alongside 16 dry-contact electromechanical relays (NO/NC).
2. Dual RBUS Redundancy: Features galvanically isolated RS-485 serial communication ports (RBUS A and RBUS B) providing bumpless data transfer to master RCUs.
3. Integrated Line & Loop Diagnostics: Advanced solid-state driver monitoring detects field wiring breaks, earth leakage, and loop short-circuits with dynamic A/D self-calibration.
4. Configurable Fail-Safe Modes: Features an ultra-fast hardware watchdog cutoff (under 65 ms) and adjustable software down-counters (100 ms to 65 s) driving channels to safe de-energized states during process bus drops.
5. High Breaking Capacity: Onboard relays handle up to 5 A at 24 VDC and 2 A at 250 VAC inductive loads, eliminating auxiliary interposing relay banks in automation cubicles.

Compatibility:

• Integrated Automation Systems (IAS): Kongsberg K-Chief 500, K-Chief 600, and K-Chief 700 marine automation frameworks.
• Propulsion & Thruster Control: Kongsberg AutoChief 4, AutoChief C20, and AutoChief 600 propulsion management networks.
• Dynamic Positioning & Steering: K-Pos DP Systems and K-Thrust control stations.
• Field Station Cabinets: Standard integration inside Kongsberg FSC cabinets, Local Operating Panels (LOP), and Remote Control Units (RCU 420 / RCU 500 / RCU 502 series).
• Cross-Family I/O Coexistence: Operates side-by-side on identical RBUS drops with companion modules:
  • RTB420: Remote Termination Board
  • RAI-16xe / RAI-10tc: 16-Channel Analog & Thermocouple Input Units
  • RAO-8xe: 8-Channel Analog Current/Voltage Output Modules
  • RDI-32xe / RDO-16xe: Dedicated Digital High-Density Expansion Boards

Part Number Cross-References

• Primary Kongsberg Part Number: 306713
• Revision Level: Rev 1.3.1 (Fully backward-compatible with Rev 1.0, 1.1, 1.2, and 1.3 variants)
• Designator Code: RDIOR420 / RDIOR-420
• Legacy Alternative System Codes: KM-306713, 312745/B (Technical Documentation Assembly Reference)

Frequently Asked Questions

What is the primary difference between the RDIOR420 and the standard RDIO400 module?

The standard RDIO400 provides high-density solid-state inputs and outputs only. The RDIOR420 (306713) combines 16 software-definable solid-state channels with 16 heavy-duty electromechanical dry-contact relays, allowing direct switching of field actuators and solenoids without secondary external relay blocks.

Can I replace an older revision (such as Rev 1.1 or 1.2) with Rev 1.3.1?

Yes. Kongsberg hardware revision 1.3.1 maintains complete pin-for-pin and functional backward compatibility with earlier revisions of part number 306713. System cabling, terminal headers (X1–X4), and software drivers in the RCU remain identical.

How do I configure channels between Digital Input and Digital Output?

Channels 1 through 16 are configured purely via system software within the Kongsberg K-Chief or AutoChief engineering environment. No internal jumpers or hardware dipswitches need adjustment on the physical circuit board.

What does a steady red status LED indicate on the front faceplate?

A steady red indicator indicates an active fault condition. This occurs when communication has been lost across both RBUS channels, internal DC supply voltages drop below 18 VDC, a processor watchdog error occurs, or the module has tripped an internal self-test failure. If the LED alternates between green and red, check the communication line termination resistors on RBUS A and B.

Are the pluggable screw terminal blocks included with the replacement module?

Factory New and Reconditioned units can be supplied with the complete 4-piece Phoenix COMBICON terminal connector set (X1 to X4) upon request. If retrofitting into an existing cabinet, the existing field-wired terminal blocks plug directly into the replacement chassis without rewiring.