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Yokogawa ARM15A-000 Relay Boards

The Yokogawa ARM15A-000, also cataloged as the ARM15A Relay Board, operates as a dedicated hardware component for 32-point mechanical dry contact input processing within the CENTUM VP FIO subsystem.

Hardware Specifications

Parameter	Specification
ModelBrand	ARM15A-000
Origin	Yokogawa, Japan
Weight	2.2 kg
Dimensions	482.6 mm × 132.5 mm (19-inch Rack, 3U)
OperatingTemp	0 to 50 degC
PowerConsumption	24 VDC, Max. 0.32 A (internal circuit)
Usage	Mechanical Relay Contact Input (Single / Dual-redundant)
Number of Contact Points	32
Field Connection Terminals	M4 screw terminals
Compatible DI Modules	ADV151 (32-point) with ATD5A terminal block, ADV161 (64-point, requires 2 boards)
Compatible Signal Cables	AKB331 (32-point), AKB337 (64-point)
Contact Input Signal	ON ≤150 Ohm, OFF ≥200 kOhm
External Contact Rating	≥30 VDC, ≥20 mA
Minimum Load	≤21.6 VDC, ≤13 mA
Field Device Power Supply	24 VDC per line, Max. 0.3 A per 16 points
Insulation Resistance	≥10 MOhm (500 VDC)
Withstanding Voltage	Field terminals to Case: 1.5 kVAC/1 min24 V terminals to Case: 500 VAC/1 min24 V terminals to Field: 1.5 kVAC/1 min
Standards Compliance	CE, UKCA, KC, RCM (C-Tick)

Process Control & DCS Features

The board provides channel-to-channel isolation to prevent signal interference between relay circuits and adjacent I/O channels. It supports integration with 4-20 mA HART loop protocol and ensures compatibility with FOUNDATION Fieldbus or Profibus PA networks through galvanic isolation of input terminals. Cold junction compensation (CJC) is applied internally to maintain accuracy in fluctuating ambient temperatures.

Frequently Asked Questions

Q: VnA: Can the ARM15A-000 be hot-swapped during operation?
A: No. The board requires system power-down before insertion or removal to avoid relay contact misoperation.

Q: VnA: What is the expected switching delay for relay contacts?
A: Mechanical switching delay is typically below 10 ms per channel under rated load.

Q: VnA: Is firmware or software configuration needed for the board?
A: No firmware is required; it functions as a passive mechanical interface. Configuration occurs at the connected DI module or DCS.

Field Installation Guidelines

• Mount the board in a standard 19-inch rack with 3U spacing.
• Ensure M4 terminal screws are torqued to manufacturer specifications.
• Maintain proper grounding of shielded signal cables to minimize electromagnetic interference.
• Route power lines separately from signal lines to reduce crosstalk.
• Allow sufficient airflow around the board to maintain ambient temperature below 50 degC.
• Use dual-redundant power supply lines per 16 points to enable fail-safe operation in redundant configurations.

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