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Yokogawa ARM55D-000 Relay Board Module

Configured for discrete dry contact signal distribution in CENTUM VP I/O architecture, the Yokogawa ARM55D-000 (ARM55D-000 Relay Board) provides direct physical/electrical execution of 32-point mechanical relay switching within Yokogawa field I/O racks.

The module interfaces downstream digital output channels to field devices via isolated dry contact relays, converting low-level control signals into galvanically separated switching states. Integration is designed for backplane-driven coordination with compatible FIO digital output modules in Yokogawa CENTUM VP and CENTUM CS 3000 systems.

Suffix Breakdown & Model Matrix

• ARM55D: 32-point mechanical relay output board (dry contact, NO type)
• -0: Fixed configuration code
• 0: 19-inch rack mount variant
• 0: basic construction type

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa ARM55D-000
Origin	Japan
Weight	2.2 kg
Dimensions	482.6 mm x 132.5 mm x 184 mm
OperatingTemp	0 degC to 50 degC
PowerConsumption	24 VDC, max 0.65 A
Output Channels	32-point dry contact (NO, a-contact)
Contact Rating	250 VAC 2 A, 30 VDC 2 A, 125 VDC 0.1 A
Insulation Resistance	>= 10 MOhm at 500 VDC
Dielectric Strength	Up to 3 kVAC (field to case)
Terminal Type	M4 screw terminals

Channel-to-Channel Isolation and Relay Execution Characteristics

The ARM55D-000 implements mechanical relay separation per channel group to prevent backfeed propagation between output lines in CENTUM VP field termination structures. Each relay channel operates as a discrete electromechanical switching element driven by upstream digital output modules over Yokogawa FIO backplane signaling. Contact bounce and mechanical switching delay are inherent to relay actuation and must be considered in sequence timing logic.

The output structure is aligned with channel isolation behavior typical in Yokogawa DCS I/O subsystems, where galvanic separation is maintained between field circuits and system electronics through relay-based switching stages rather than semiconductor output drivers.

Frequently Asked Questions

Q: Can ARM55D-000 outputs be hot-swapped during operation?
A: No. Mechanical relay boards in CENTUM VP I/O racks require system power removal or controlled maintenance mode before insertion or removal to avoid backplane transient stress.

Q: What is the typical relay switching constraint for sequencing logic?
A: Switching behavior is determined by mechanical actuation delay and contact bounce. External logic must account for millisecond-scale delay before stable contact closure is confirmed.

Q: Does each channel provide electrical isolation from adjacent channels?
A: Each relay channel provides galvanic separation at contact level; however, isolation grouping depends on internal board layout and shared power distribution architecture.

Field Installation Guidelines

• Install module only in compatible 19-inch Yokogawa FIO rack assemblies.
• Ensure 24 VDC power is fully isolated before wiring field terminals.
• Use M4 screw terminals with proper torque control to prevent loosening under vibration.
• Maintain minimum spacing for field wiring to avoid cross-contact between high-voltage switching lines.
• Ground rack frame according to system cabinet grounding scheme to minimize noise coupling.
• Verify dry contact load limits before connecting inductive or capacitive field loads; external suppression may be required.

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