SARM55D | Yokogawa Terminal Board (Mechanical Relay Dry Contact Output NO)

Product Overview

The SARM55D is a mechanical relay dry contact output terminal board providing 32 normally-open (“a” contact) points. It connects digital output modules ADV551/ADV561 to field devices in the CENTUM VP FIO subsystem.

Key Features

• 32 dry contact output points (NO)
• M4 screw terminals
• Single or dual-redundant support
• High load capacity
• Robust isolation

Technical Specifications

• Contact Points: 32
• Contact Type: Dry contact (“a” contact / NO)
• Terminals: M4 screws
• Maximum Load: 250 V AC 2 A, 30 V DC 2 A, 125 V DC 0.1 A per point
• Minimum Load: 5 V, 10 mA
• Internal Power: 24 V DC, max 0.65 A
• Insulation Resistance: ≥10 MΩ at 500 V DC
• Withstanding Voltage: 2 kV (field to case), 500 V (power to case), 2 kV (power to field)
• Dimensions: 482.6 mm (W) × 132.5 mm (H) (3U)
• Weight: Approx. 2.2 kg
• Ambient: 0 to 50 °C, 10 to 90 %RH

FAQ

• What contact type is provided? Normally open (“a” contact).
• Is it compatible with ADV561? Yes, with two boards and AKB337 cables for 64-point configurations.
• What is the maximum current at 250 V AC? 2 A per point.

Installation Guide

1. Mount the board in the 19-inch rack.
2. Connect the signal cable (AKB331/AKB337) to the digital output module.
3. Terminate field wiring on the M4 terminals.
4. Supply external 24 V DC power.
5. Test each output channel under load.

Selection Tips

• Select when standard normally-open dry contacts are required.
• Confirm load current and voltage ratings.
• Choose over SARM55C when only NO contacts are needed and M4 terminals are preferred.