STN ATLAS RM401

Technical Specifications

1. Channel Configuration: 4-channel digital signal input, 4-channel mechanical relay output
2. Input Signal Compatibility: Dry contact digital input, 24VDC voltage discrete signals
3. Relay Output Rating: Relay contact rated 250VAC / 150VDC, 8A resistive load maximum
4. Supported Communication Protocols: Modbus RTU/TCP, CANopen, Profibus marine fieldbus interfaces
5. Power Supply: 24VDC standard shipboard DC power
6. Operating Temperature: -20℃ ~ +70℃ marine wide temperature range
7. Vibration Standard: IEC 60068 marine vessel anti-vibration certification
8. Protection Grade: IP20 indoor marine electrical cabinet installation
9. Mounting: Standard 35mm DIN rail snap mounting

Functional Features

1. Integrated DI+DO combined module, simultaneously collecting field digital sensor signals and driving marine load equipment via mechanical relay contacts
2. Multi-industrial marine fieldbus communication compatibility, seamlessly connected to STN ATLAS main ship automation controllers
3. Built-in self-diagnosis circuit, real-time monitoring input channel open/short circuit faults and relay contact abnormal wear status
4. Front panel LED status indicators for each input channel and relay output channel, visual running and fault status display
5. Support IEC 61131-3 standard programming language configuration, user-customizable interlock logic via engineering software
6. Compact modular design, flexible expansion of ship automation I/O racks by stacking multiple RM401 modules

Working Principle

Structure & Material

1. Housing: Transparent front cover flame-retardant ABS plastic DIN rail module shell; transparent cover allows direct visual observation of LED indicators without opening cabinet door
2. Internal Hardware: Isolated input signal conditioning PCB, four independent mechanical signal relays with arc suppression circuits
3. Terminals: Multi-row screw terminal blocks on module bottom for field DI/DO load wiring and bus communication wiring
4. Physical Weight: 0.5kg

Installation Requirements

1. Snap mount onto standard 35mm DIN rail inside marine dehumidified electrical cabinet
2. All field sensor and load wiring use marine-grade shielded control cables, single-point grounding of cable shielding at cabinet grounding busbar
3. Maintain 20mm vertical gap between adjacent I/O modules for heat dissipation of relay contact arc heat
4. Separate low-voltage signal wiring from high-current pump power wiring (≥30cm clearance) to eliminate electromagnetic interference

Application Scenarios

• Ship engine room auxiliary pump, cooling fan automatic start-stop control
• Cargo hold ballast valve, drain valve limit switch signal collection and valve drive control
• Marine fire detection, smoke alarm contact signal acquisition, alarm siren relay output control
• Vessel cabin ventilation system, lighting automation control
• Offshore platform machinery room safety interlock signal processing

Operation & Maintenance Notes

1. Monthly check front panel LED indicator status, record faulty input/output channels for scheduled overhaul
2. Every 12 months inspect relay contact condition; frequent switching loads will cause contact ablation and require module replacement
3. Tighten all wiring terminal screws semi-annually to eliminate loose contact caused by ship hull long-term vibration
4. Do not connect load current exceeding 8A to relay output contacts to prevent relay contact melting damage