Description
STN ATLAS RM401
Technical Specifications Model: RM401 Brand: STN ATLAS Power Supply: 24V DC marine auxiliary power Input Channels: Mixed analog input and digital input channels Communication: Marine fieldbus interface Operating Temperature: -10 ℃ ~ +55 ℃ Storage Temperature: -25 ℃ ~ +70 ℃ Relative Humidity: 10% ~ 95%, non-condensing Mounting: DIN rail or cabinet rack installation inside marine control cabinet Protection Class: IP20 Environmental Rating: Designed to meet marine vessel environmental requirements
Functional Features Multi-channel analog input collects 4-20mA measurement signals from temperature, pressure and liquid level transmitters. Digital input channels read dry contact status from limit switches, pressure switches and safety alarm contacts. Per-channel self-diagnosis detects open circuit and short circuit fault of field sensor wiring. Marine fieldbus transmits measurement and status data to ship central monitoring unit. Front panel LED indicators display module power status, running state, bus communication and channel fault. Non-volatile memory stores module configuration parameters and alarm event logs. Built-in surge protection circuit suppresses transient voltage surge from marine power grid. Uploads alarm signals to ship central alarm panel when measurement value exceeds preset limit.
Application Scenarios Ship engine room machinery monitoring, ballast tank level monitoring, auxiliary pump and fan status collection, marine cooling system measurement monitoring, vessel fire alarm auxiliary signal acquisition, cargo hold environmental monitoring.
Performance Parameters Analog measurement maintains high stability under hull vibration and temperature fluctuation. Digital input reliably identifies contact open and closed state in marine environment. Self-diagnosis circuit detects wiring fault and sends alarm message immediately. Fieldbus communication keeps stable data transmission under marine electromagnetic interference. Configuration parameters and alarm logs remain stored after power supply interruption. Surge protection circuit protects internal electronic components against marine power surge.
Material Composition Housing: Flame-retardant plastic front panel and metal electromagnetic shielding frame. Main PCB: FR4 multi-layer printed circuit board with heavy-duty moisture and salt mist resistant conformal coating. Core Electronic Components: Microcontroller, ADC sampling chips, digital input protection chips, marine bus transceiver, surge suppression components, non-volatile memory chip. Terminal Parts: Vibration-resistant copper alloy screw terminals for field sensor wiring. Indicator Components: High brightness LED status indicators on front panel. Fasteners: Stainless steel anti-corrosion screws and DIN rail spring clip.
Structural Features Compact rectangular cabinet module structure for marine control cabinet installation. Front panel equipped with LED indicators and module identification marking. Rear side integrates screw terminals for 24V DC power, fieldbus cable and field sensor wiring. Metal shielding frame reduces external electromagnetic interference. Internal circuit layout separates analog measurement circuit, digital signal circuit and bus communication circuit. PCB components adopt vibration enhanced soldering process for marine anti-vibration requirement.
Working Principle 24V DC marine auxiliary power supplies RM401 module. Analog signals from tank and machinery transmitters and digital contact signals from field switches connect to module input terminals. ADC chips convert analog current signal into digital measurement value, and digital input circuit captures contact on-off state. Onboard microcontroller packages all measurement and status data and transmits data to ship central monitoring unit via marine fieldbus. Self-diagnosis circuit continuously monitors each signal channel and module hardware. When measurement value exceeds alarm threshold or channel wiring fault appears, fault LED activates and alarm information uploads to ship central alarm monitoring system and saves into event log.
Installation Requirements Install RM401 inside dry marine control cabinet and mount on NS35 DIN rail. Connect 24V DC marine power supply, fieldbus cable and field sensor cables to corresponding terminals. Use marine shielded twisted pair cables for analog signal and fieldbus wiring. Complete protective earth connection from module metal frame to ship grounding system. Set module station address, measurement range and alarm threshold in system configuration software. Test all analog and digital channels after wiring and parameter configuration. Keep sufficient separation distance between module and high-power inverter cables.
Usage Precautions Check terminal screw tightness regularly, as hull continuous vibration loosens screw terminals. Maintain dry cabinet environment to avoid salt mist condensation. Do not apply voltage exceeding rated range to input terminals. Do not disassemble module housing without professional authorization. Back up module configuration data before module replacement or maintenance. Cut off module power before modifying field sensor wiring. Inspect cable insulation condition periodically in marine salt spray environment.
