KONGSBERG RPM420S Remote Analogue Input Current Module
I. Basic Records
RPM420S Front View
Module Appearance
Brand: Kongsberg Maritime
Model Name: RAIC400 Remote Current Analog Input Module
Original Part Number: 600120
System Belonging: RIO400 Remote I/O Complete SPBus Bus Automation System
Function: Acquire field 4–20mA / 0–20mA current transmitter signals, convert them into digital SPBus data, and upload to the RCU500 main controller, UMS engine room monitoring system, or DP dynamic positioning system
Core Hardware and Channel Specifications
Analog Input Channels
Up to 32 independent current input channels, each isolated
Standard signal: 0–20mA / 4–20mA (common industry transmitter ranges)
Built-in sampling resistor: 220Ω
Conversion accuracy: ±0.2% FS (full scale)
ADC resolution: 12-bit high-precision analog-to-digital conversion
SPBus Communication Bus
Dual SPBus interfaces supporting redundant hot standby (single bus or dual-redundant wiring modes)
Physical layer: RS485 multi-drop bus with Manchester encoding, maximum baud rate 2MHz
Bus electrical isolation: 500V optocoupler isolation to eliminate interference from hull ground potential differences
Bus power supply: Powered via SPBus bus; no external power source required
SPBus interface terminal: 9-pin male DB9 connector
Power Supply and Power Consumption
Operating voltage: DC 10–28.8V (standard marine 24V range)
Maximum power consumption at full load: ≤6W (all 32 channels loaded)
Dimensions, Installation, and Mechanical Parameters
Dimensions: Height 355mm × Width 158mm × Depth 87mm
Net weight: Approx. 1.35kg
Installation method: Standard DIN rail clip-on mounting
Terminal block: Screw-type terminals compatible with 2.5mm² cable; plug-in module design enables quick replacement without shutdown
Status indicators: Multi-color LEDs on front panel indicating power, SPBus A/B communication, channel fault, and module self-test anomalies
Environmental and Marine Certifications
Operating temperature: 0°C ~ +70°C; Storage temperature: -25°C ~ +70°C
Humidity: Up to 100% RH (non-condensing), resistant to high humidity and salt spray in marine environments
Vibration and shock resistance: Complies with IEC 60945 maritime equipment standards
Safety level: Single module SIL1/SIL2; dual-redundant configuration achieves SIL3 safety level
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