Technical Specifications:

• Product Series: CENTUM CS3000 / VP Series
• Model Number: DM1C-004F-1A6A
• Number of Channels: 4 channels
• Input Type: 24 VDC (configurable as sink NPN or source PNP via 1A6A)
• Input Voltage: 24 VDC (nominal)
• Input Current: 3.5 mA (per channel, typical)
• Response Time: 10 ms (maximum)
• Isolation: Photocoupler isolation, 1500V DC
• Power Supply: 5 VDC (from backplane bus)
• Communication: CS3000 Bus (high-speed local bus, 10 Mbps)
• Operating Temperature: 0°C to +55°C
• Dimensions: Approximately 25 × 160 × 140 mm (W×H×D)
• Weight: Approximately 0.4 kg

Functional Features:

• 4-channel digital input with photocoupler isolation
• Sink (NPN) or Source (PNP) input configurable via model suffix
• LED status indicators per channel for visual monitoring
• Deadband filtering to eliminate contact bounce
• On-board diagnostics: Open circuit detection, short circuit detection per channel
• Hot-pluggable (with system configuration support)
• Compatible with CENTUM VP and CS3000 controllers

Performance Parameters:

• Input Impedance: 4.7 kΩ (typical, for 24VDC input)
• Leakage Current: Less than 1 μA (OFF state)
• Isolation Voltage: 1500V DC (field to bus)
• Dielectric Withstand Voltage: 1800V AC, 50/60Hz, 1 minute
• Power Consumption: 1.5W per module (typical)
• MTBF: Over 200,000 hours
• Contact Rating (if applicable): 250VAC, 1A (resistive)

Material Composition:

• Housing: Flame-retardant epoxy resin (front), Steel chassis (SPCC) (rear)
• Terminal Block: Phoenix Contact compatible screw terminals
• Isolation: Photocoupler (optocoupler) with LED status indicator per channel
• PCB: FR-4 glass epoxy with conformal coating

Structural Features:

• Rack mounting in CS3000 I/O cabinet (19-inch EIA standard)
• Backplane connector for bus communication
• Screw terminal blocks for field wiring (top or bottom)
• Status LEDs per channel (green = ON, red = OFF)
• DIP switches or software configuration for input type selection

Working Principle: The DM1C-004F-1A6A receives 24VDC discrete signals from field devices (switches, relays, proximity sensors, limit switches) through its terminal blocks. Each input channel uses a photocoupler (opto-isolator) to electrically isolate the field signal from the internal bus. When a 24VDC signal is present at the input, the optocoupler’s internal LED illuminates, activating the phototransistor, which sends a digital signal to the CS3000 controller via the backplane bus. The module scans all 4 channels cyclically (every 10 ms) and reports the status to the DCS. Debounce filtering eliminates false triggers from mechanical contact bounce.

Advantage Highlights:

• Reliable photocoupler isolation protects the DCS from field electrical noise and transients
• Flexible input configuration (NPN/PNP selectable per model)
• Clear LED indicators for quick troubleshooting on the front panel
• Proven Yokogawa quality with MTBF exceeding 200,000 hours
• Seamless integration with CENTUM DCS ecosystem
• Compact design for high-density I/O cabinets

Applicable Industries:

• Oil & Gas (refineries, offshore platforms, pipelines)
• Chemical & Petrochemical
• Power Generation (thermal, nuclear, combined cycle)
• Water & Wastewater
• Steel & Metals
• Pulp & Paper

Model Series:

• DM1C Series: DM1C-004F (4-ch), DM1C-008F (8-ch), DM1C-016F (16-ch), DM1C-032F (32-ch)
• Input Configurations: 1A6A, 1B6A, 1C6A, 1D6A (different voltage/current specs)
• Related Series: DM1D (Digital Output), DM1A (Analog Input), DM1M (Motion Module)

Installation Requirements:

• Rack mounting in standard 19-inch EIA rack or Yokogawa I/O cabinet
• Backplane insertion — ensure connector is fully seated before power-up
• Field wiring: Use shielded twisted pair for long cable runs
• Ambient temperature: 0°C to +55°C
• Relative humidity: 10% to 85% RH (no condensation)
• Vibration: Within IEC 60068-2-6 limits
• Grounding: Connect shield ground at control room end only

Usage Precautions:

• Verify input voltage matches module specification (24VDC nominal)
• Do not apply voltage exceeding 30VDC to any input channel
• Check LED indicators during commissioning to verify correct operation
• Configure input type (NPN/PNP) correctly before operation via system configuration
• Replace module if channel diagnostics indicate failure
• Keep terminal screws tightened to specified torque (0.5 N·m)