The Yokogawa ARM55D is a mechanical relay board designed for use in the FIO (Field Input/Output) subsystem of the CENTUM VP Distributed Control System (DCS). It interfaces between digital I/O modules and field devices, offering a reliable and efficient means of signal transmission. The ARM55D ensures smooth operation in various industrial environments by providing flexible point configurations and robust electrical characteristics.

Technical Specifications

Contact Type

• Dry Contact Output: “a” contact (NO).
• Point Configuration: Available in single or dual-redundant models.
• Contact Points: 32 points per model.

Power and Current

• Power Supply for Internal Circuit: Requires an external 24V DC power supply (max. 0.65A current).
• Power Supply for Field Devices: External power supply required.
• Current Consumption:
  • Internal Circuit: 5V, 10mA
  • Field Device Power Supply: Max. 0.65A.

Load and Resistance

• Maximum Load:
  • 250 VAC: 2A per point.
  • 30 VDC: 2A per point.
  • 125 VDC: 0.1A per point.
• Minimum Load: 5V, 10mA.
• Insulation Resistance: At least 10 MΩ at 500V DC.

Electrical Characteristics

• Withstanding Voltage:
  • Between Field Device Terminals and Case: 2 kV.
  • Between 24V Power Terminals and Case: 500 V.
  • Between 24V Power Terminals and Field Device Terminals: 2 kV.

Environmental Conditions

• Ambient Temperature: Operates within 0°C to 50°C.
• Humidity: 10% to 90% RH (non-condensing).

Physical Dimensions

• Size: 482.6 mm (W) x 132.5 mm (H) (3U size).
• Weight: 2.2 kg.

Compliance and Standards

• Safety Standards: CE Marking, CSA.
• EMC Standards: CE Marking, C-Tick, KC Marking.

Compatible Modules

• ADV551: 32-point digital output (DO) module.
• ADV561: 64-point digital output (DO) module.
• AKB331: Terminal block for 32 points.
• AKB337: Terminal block for 64 points.