Technical Specifications:

• Number of Channels: 8 channels
• Input Signal: 4–20 mA DC / 1–5 V DC (selectable per channel via configuration)
• Accuracy: ±0.1% of span
• Resolution: 16-bit A/D converter
• Sampling Rate: 250 ms per channel (all 8 channels)
• Insulation: Channel-to-channel isolation, channel-to-bus isolation
• Insulation Resistance: ≥100 MΩ at 500 VDC
• Dielectric Strength: 1500 VAC for 1 minute
• Communication Protocol: HART 7 (superimposed on 4–20 mA signal)
• Power Supply: 24 VDC (bus-powered from DCS backplane)
• Operating Temperature: 0°C to +55°C
• Mounting: DIN rail or DCS card cage (Yokogawa specified)
• Dimensions: 25 mm × 120 mm × 120 mm (W × H × D) per 8-channel module

Functional Features:

• HART 7 communication — remote configuration, diagnostics, and calibration without wiring changes
• 8 independent channels with individual configuration
• 16-bit resolution — high-precision measurement
• Channel-to-channel isolation — prevents crosstalk
• Bus-powered — no external power supply required
• LED status indicators per channel (power, alarm, communication)
• Hot-swappable in DCS card cage (with proper procedure)

Material Composition:

• Housing: Flame-retardant ABS resin (UL94 V-0)
• PCB: Multi-layer FR-4 with conformal coating
• Connectors: Yokogawa proprietary DCS backplane connector
• Terminals: Gold-plated contact pins

Structural Characteristics:

• Form Factor: DCS I/O card module
• Width: 25 mm (half-width DCS card)
• Height: 120 mm (Eurocard format)
• Connector: Yokogawa 96-pin DCS backplane connector

Working Principle:
Each of the 8 input channels receives an analog signal (4–20 mA or 1–5 V). The signal is conditioned by a precision amplifier, then converted to digital by a 16-bit A/D converter. The digital value is transmitted to the DCS controller via the backplane bus. Simultaneously, the HART 7 protocol modem superimposes digital communication onto the 4–20 mA signal, enabling bidirectional communication with HART-compatible field devices (transmitters, valves) on the same loop.

Key Advantages:

• HART over 4–20 mA — eliminates need for separate communication wiring
• ±0.1% accuracy with 16-bit resolution — extremely precise
• 8 channels in single module — high density, low cost per channel
• Full DCS integration — native compatibility with CENTUM VP/CS
• Hot-swappable — module replacement without system shutdown

Applicable Industries:

• DCS-based process control systems (Yokogawa CENTUM VP, CENTUM CS)
• Oil & Gas (refinery, offshore platforms)
• Chemical & Petrochemical
• Power Generation
• Pharmaceutical

Installation Requirements:

• Install in Yokogawa DCS card cage (specified backplane)
• Connect to DCS controller via backplane bus
• Wire field signals to screw terminals (AWG 22–14)
• Configure channel type (mA/V) via DCS engineering software (System View)
• Ensure 24 VDC bus power is stable (±5%)

Usage Precautions:

• Do not mix mA and V inputs on the same channel without proper configuration
• Maximum input voltage: 5 VDC — do not exceed
• Ensure proper grounding of signal cable shields
• Follow hot-swap procedure per Yokogawa DCS manual
• Do not install in environments exceeding +55°C