Description

Yokogawa AD5*D Terminal Board

The Yokogawa AD5*D-0, also cataloged as the AD5*D Terminal Board, operates as a dedicated hardware component for signal termination and bridging between field devices and FIO modules within CENTUM VP and CENTUM CS 3000 systems.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa AD5*D
Origin	Japan
Weight	0.2 kg
Dimensions	3.2 cm × 12.5 cm × 13.0 cm
OperatingTemp	0 to 50 degC
OperatingHumidity	10% to 90% RH (Non-condensing)
MountingType	DIN-rail or panel mount
CompatibleSignalCable	Yokogawa AKB331
InsulationResistance	≥ 10 MΩ at 200 VDC; up to ≥ 10 MΩ at 500 VDC
WithstandingVoltage	200–500 VAC for 1 min (per module insulation class)
CorrosionResistance	ISA-S71.04 Class G3 (if code 6/F selected)

DCS-Specific Signal Characteristics

The AD5*D Terminal Board supports direct channel-to-channel isolation for digital and analog signals routed into FIO modules. Loop-level integration is compatible with 4-20 mA HART protocol signaling. Cold junction compensation is applicable when connected to thermocouple field devices, maintaining consistent voltage references across signal channels. Redundant digital I/O configurations are accommodated without cross-channel interference.

Frequently Asked Questions

Q: VnA: Can the AD5*D be hot-swapped while FIO modules are energized?
A: No. Terminal boards require de-energized conditions during insertion or removal to maintain signal integrity and prevent transient overvoltage.

Q: VnA: What is the expected insulation performance for mixed analog and digital signal channels?
A: Standard operation maintains ≥ 10 MΩ at 200 VDC. With module-specific configurations, insulation withstands up to 500 VDC without breakdown.

Q: VnA: Does the AD5*D support FOUNDATION Fieldbus or Profibus PA directly?
A: The terminal board provides physical termination only; protocol-specific modules must handle digital communication. Electrical routing preserves signal isolation and integrity.

Field Installation Guidelines

• Mount the AD5*D on a standard DIN-rail or control panel using screws with firm torque.
• Ensure proper grounding of signal shields to reduce EMI.
• Route digital and analog signal cables separately to avoid crosstalk.
• Maintain recommended bend radius for AKB331 cables to prevent conductor strain.
• Confirm power isolation on FIO modules before terminal board installation.
• If installing in hazardous areas, verify explosion protection and corrosion-resistant code compliance.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems