ALSTOM L54E1100BC00

Technical Specifications

• Safety Integrity Level: SIL4 (EN 50128 / EN 50129)
• Operating Supply Voltage: 24 V DC ±10%
• Power Consumption: Max 18 W
• Operating Temperature Range: -20°C ~ +70°C
• Storage Temperature Range: -40°C ~ +85°C
• Humidity Tolerance: 5% ~ 95% RH non-condensing
• Vibration Resistance: 10–200Hz, 2g continuous vibration
• Shock Resistance: 15g peak shock (11ms pulse)
• Communication Bus: VME industrial backplane bus
• Input Channels: 16 galvanically isolated analog vital input channels
• Output Channels: 8 fail-safe relay output channels
• Isolation Voltage: 2500V AC between field circuit and backplane bus
• PCB Protection Coating: Conformal acrylic coating (IP30 internal cabinet rating)

Function Features

1. Dual redundant signal sampling circuit for 100% fail-safe operation
2. Continuous self-testing of input/output channels every 10ms to detect open/short circuit faults
3. Hardware interlock logic prevents dangerous false output actuation under single component failure
4. Galvanic isolation between field wiring and control backplane eliminates ground loop interference
5. Real-time fault diagnosis data transmitted via VME bus to main interlocking CPU

Performance Parameters

• Signal sampling cycle: 10 ms deterministic fixed cycle
• Channel fault detection response time: ≤20 ms
• Relay output switching life: ≥10⁷ mechanical operations
• Analog input measurement accuracy: ±0.2% full scale
• Common-mode noise rejection ratio: ≥120 dB
• MTBF: 220,000 hours at 40°C operating temperature

Material Composition

• Base substrate: FR4 high-Tg flame retardant PCB
• Surface coating: Acrylic conformal protective coating
• Signal relays: Silver alloy contact safety relays
• Isolation components: High withstand voltage optocouplers
• Backplane connector: Gold-plated copper alloy edge connector
• Enclosure: Aluminum alloy rack guide rail frame

Structural Characteristics

• Standard 6U VME single-width PCB form factor
• Front panel with LED status indicators for each channel
• Screw terminal block for field wiring on front panel
• Back edge VME bus connector for rack data communication
• Reinforced mounting lugs for rack vibration resistance
• Separate analog signal zone and digital logic zone PCB layout

Working Principle

Advantage Highlights

1. Full SIL4 compliance for highest railway safety standard applications
2. Integrated channel self-test without external auxiliary equipment
3. Conformal coating enables stable operation in damp tunnel trackside cabinets
4. VME bus compatibility with all Alstom Microrec interlocking racks
5. Hardware safety logic independent of software CPU to eliminate software single point of failure

Applicable Industries

Installation Requirements

1. Install inside IP54 rated sealed industrial control cabinet only
2. Mount on standard 6U VME rack with fixed rail locking screws
3. Field wiring torque limit: 0.6 N·m for terminal block screws
4. Separate safety signal wiring from power cables with minimum 20cm clearance
5. Cabinet internal forced air cooling required for continuous operation above 55°C ambient

Usage Precautions

1. Complete power cut to rack before card insertion/removal to avoid backplane bus damage
2. Do not operate outside -20°C ~ +70°C temperature range; high temperature accelerates relay contact aging
3. Prevent liquid ingress and conductive dust accumulation on PCB surface
4. Regular annual cleaning of front panel terminal blocks to avoid oxidation contact resistance
5. Replace card immediately upon continuous channel fault alarm; no field repair of PCB components permitted