The Yokogawa A1BD5D‑06, also cataloged as the A1BD5D terminal board, serves as a dedicated A1BD5D digital terminal interface for single‑ and dual‑redundant 32‑channel dry‑contact signal routing within CENTUM‑series control networks.
Hardware Specifications
Parameter
Specification
Model
A1BD5D‑06
Brand
Yokogawa
Origin
Not specified
Weight
0.53 kg (shipping: 1.5 kg)
Dimensions
18.4 cm × 48.2 cm × 13.2 cm
Operating Temp
Not specified
Power Consumption
Not specified
Product Type
Digital Terminal Board
Channels
32 dry‑contact channels
Redundancy
Single / dual‑redundant
Field Terminals
M4 screw terminals
Insulation Resistance
≥ 10 MΩ at 500 V DC
Suffix Code 1
0 = Always 0
Suffix Code 2
6 = ISA Standard G3 option, no explosion protection
Mounting
DIN‑rail mount type
4‑20 mA HART Loop Protocol & Channel‑to‑Channel Isolation
Although the A1BD5D‑06 is a digital terminal board, Yokogawa applies the same isolation principles used in HART loop conditioning. Each of the 32 channels is mechanically isolated, preventing cross‑talk when switching dry‑contact signals in redundant architectures. The M4 terminal layout maintains separation distances that reduce noise coupling from adjacent circuits. ISA G3 environmental compliance ensures stable operation under corrosive‑gas‑resistant industrial conditions.
Frequently Asked Questions
Q: Can the A1BD5D‑06 be hot‑swapped? A: No. Terminal boards must be inserted or removed only when the I/O segment is de‑energized to avoid unintended contact transitions.
Q: Does the board support mixed contact types? A: No. The board provides 32 dry‑contact digital channels only.
Q: Are the terminals suitable for control‑room wiring gauges? A: Yes. M4 screw terminals support typical field‑device wiring used for interlocks and digital signaling.
Field Installation Guidelines
Mount the board on a DIN rail using the designated hardware to ensure correct alignment with adjacent I/O modules.
Route digital wiring separately from analog loops to prevent impedance coupling.
Maintain shield continuity and terminate shields at a single grounding point to avoid ground‑loop interference.
Verify torque on M4 terminals to ensure stable mechanical retention under vibration.
Inspect channel groups during commissioning to confirm correct single‑ or dual‑redundant configuration.
