Product Parameters
- Model Number: ARM55W-000 S2
- Type: Mechanical Relay Board (Wet Contact Output)
- Output Channels: 32-point
- System Compatibility: Yokogawa CENTUM VP, ProSafe-RS (FIO subsystem)
- Max Load: * 250 V AC: 0.6 A per point
- 30 V DC: 0.6 A per point
- 125 V DC: 0.1 A per point
- Field Device Terminals: M4 Screws
- Internal Current Consumption: Max 0.65 A at 24 V DC
- Isolation Resistance: At least 10 MΩ (500 V DC)
Product Description The Yokogawa ARM55W-000 S2 is a high-reliability relay board designed for the FIO (Field I/O) subsystem within CENTUM VP and ProSafe-RS control architectures. Unlike “dry” contact boards, the ARM55W is a Wet Contact Output module, meaning it is engineered to supply power directly to field devices from an external power source through its internal relays. It typically interfaces between digital output modules (such as the ADV551 or ADV561) and field equipment, providing signal amplification and galvanic isolation. The “S2” hardware revision ensures robust performance and strict compliance with updated industrial EMC standards.
Application Areas This relay plate is extensively used in safety-instrumented systems and general process automation. It is ideal for driving high-current or high-voltage field devices that exceed the direct capacity of standard PLC/DCS output cards, such as solenoid valves, motor starters, heavy-duty interlocks, and audible/visual alarm indicators in refineries and chemical plants.
Product Specifications
- Weight: 2.2 kg (Board only)
- Dimensions: 482.6 mm x 132.5 mm (Standard 19-inch rack, 3U height)
- Country of Origin: Japan
- Operating Temperature: 0 to 50 °C (10 to 90 %RH)
Operational Precautions
- Inductive Loads: When switching inductive loads (solenoids, relays), always connect a spark killer—such as a CR network for AC or a diode for DC—in parallel with the load to prevent contact arcing.
- Redundancy: To utilize the dual-redundant capability of the FIO modules, ensure the appropriate AKB331 or AKB337 signal cables are used and properly secured to both A and B side connectors.
- External Power: The “Wet Contact” configuration requires an external 24 V DC supply for the field device power line; verify the polarity and current capacity of your power source before energizing.
- Torque: Ensure the M4 field terminal screws are tightened to the manufacturer’s specified torque to prevent overheating or signal loss due to vibration.
Recommended Similar Product Models
| Model Number | Product Category | Contact Type |
|---|---|---|
| ARM55D-000 | Relay Board | Dry Contact (NO) |
| ARM55T-000 | Relay Board | With AUTO/OFF/ON Switches |
| ARM55C-000 | Relay Board | Configurable (NO or NC) |
| ARS55M-3 | Solid State Relay | 5-60 V DC Output |
| ADV551 | Digital Output Module | 32-point FIO Module |
