Description

Yokogawa ARM55C-000 Mechanical Relay Output Board

Configured for dry-contact relay output switching in CENTUM VP and CENTUM CS 3000 FIO subsystems, the Yokogawa ARM55C-000 (ARM55C Mechanical Relay Output Board) provides direct physical and electrical execution of field load control through isolated mechanical relay contacts.

Suffix Breakdown & Model Matrix

Code	Description
ARM55C	Mechanical Relay Output Board, 32-point dry contact type
-0	Basic specification
0	19-inch rack-mountable configuration
0	Basic type

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa ARM55C-000
Origin	Japan
Weight	Approx. 2.2 kg
Dimensions	482.6 mm (W) x 132.5 mm (H) x 298.5 mm (D)
OperatingTemp	0 to 50 degC
PowerConsumption	Max. 0.85 A at 24 VDC (approx. 26 W)
Product Type	Mechanical Relay Output Board
Number of Channels	32 points
Rated Supply Voltage	24 VDC
Control Logic Signal	5 VDC, 10 mA
Maximum AC Load	250 VAC, 2 A per channel
Maximum DC Load	30 VDC, 2 A or 125 VDC, 0.1 A per channel
Minimum Load	5 VDC, 10 mA
Insulation Resistance	10 MOhm minimum at 500 VDC
Dielectric Strength	2 kVAC field-to-case
Humidity	10 % to 90 % RH, non-condensing
Mounting Method	19-inch rack, 3U height

Channel Isolation and DCS Output Interface

The ARM55C-000 functions as an isolation interface between digital output modules and field-side loads. Mechanical relays provide galvanic separation between control circuitry and output circuits, reducing direct electrical coupling between channels. The board is designed for integration with Yokogawa FIO architectures and can be deployed in single or dual-redundant output arrangements using compatible digital output modules and signal cables.

Frequently Asked Questions

Q: Does the ARM55C-000 support hot-swapping during operation?
A: No. Removal or installation should be performed with the associated I/O circuit de-energized to avoid unintended relay state transitions and wiring faults.

Q: Can the board be used in redundant output configurations?
A: Yes. The ARM55C-000 supports dual-redundant configurations when installed with the required redundant output modules and associated signal cable assemblies.

Q: Does the board require firmware updates?
A: No. The ARM55C-000 is a hardware relay board and contains no field-upgradable firmware. Firmware management applies to the connected control modules rather than the relay board itself.

Field Installation Guidelines

• Install the board in a compatible 19-inch rack using the designated mounting hardware.
• Verify that field wiring is terminated to the correct M3.5 terminals and power wiring to the designated M4 terminals.
• Route output wiring separately from high-voltage power cables to minimize electromagnetic coupling.
• Connect cable shields according to site grounding standards and DCS cabinet grounding practices.
• Confirm contact ratings of connected loads before energization to prevent relay contact overstress.
• Inspect terminal screw tightness during commissioning and scheduled maintenance intervals.
• Perform insulation and continuity checks prior to connecting field loads.

Specifications

• Brand: Yokogawa

Advantages

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