Robust Switching for Demanding Applications
This board provides 32 discrete relay outputs for controlling field devices in large-scale process systems. It handles substantial switching loads with its 5 A contact rating per channel. Many engineers prefer this module for its balance of channel density and power handling capability. The unit offers reliable performance across a wide range of industrial automation tasks.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | ARM55D |
| Dimensions | 250 mm × 150 mm × 50 mm (W × H × D) |
| Weight | 1.35 kg |
| Power Supply | 24 V DC ±10% |
| Power Consumption | 18 W typical (all relays energized) |
| Output Channels | 32 form-C (SPDT) relays |
| Contact Rating | 5 A at 250 V AC / 30 V DC |
| Switching Voltage | 250 V AC / 30 V DC maximum |
| Switching Current | 5 A maximum per contact |
| Contact Resistance | ≤50 mΩ initial |
| Mechanical Life | 20,000,000 operations |
| Electrical Life | 100,000 operations at rated load |
| Response Time | ≤12 ms (energize), ≤8 ms (de-energize) |
| Coil Voltage | 24 V DC |
| Coil Power | 0.75 W per relay |
| Inrush Current Capability | 10 A for 20 ms |
| Operating Temperature | -10°C to +55°C |
| Storage Temperature | -20°C to +70°C |
| Humidity Range | 5% to 85% RH (non-condensing) |
| Status Indicators | 32 LED indicators (one per channel) |
| Terminal Type | 4 × 16-pin ribbon cable connectors |
| Mounting | Backplane or DIN rail (with optional adapter) |
| Certifications | CE, UL, CSA |
Relay Configuration and Contact Arrangement
This board equips each of its 32 channels with a form-C contact set. Each relay provides both normally open and normally closed terminals for maximum wiring flexibility. The 5 A contact rating accommodates solenoid valves, contactors, and indicator lamps. This versatility makes the module suitable for diverse output control scenarios.
Power Requirements and Energy Distribution
The unit draws 18 W when all relays stay in the energized state. Each individual coil consumes 0.75 W from the 24 V DC supply. The board does not incorporate internal energy storage components. Proper power supply sizing ensures reliable operation under full load conditions.
Mechanical Design and Physical Specifications
This module measures 250 mm wide and weighs 1.35 kg. The robust PCB construction supports the weight of 32 large relays. Four ribbon cable connectors provide convenient interface to external termination assemblies. The board fits standard Yokogawa mounting racks with dedicated guide slots.
Diagnostic Feedback and Channel Monitoring
Thirty-two LEDs offer immediate visual status for every output channel. An active LED confirms the corresponding relay coil has energized. This clear indication aids operators during commissioning and routine inspections. Field technicians can verify output states quickly without diagnostic software.
Switching Performance and Load Handling
These relays achieve 20 million mechanical operations in dry circuit conditions. At full 5 A load, the contacts endure 100,000 switching cycles reliably. The module also supports inrush currents up to 10 A for 20 milliseconds. This inrush capability suits motor starters and capacitive loads common in process plants.
Safety Certifications and Industry Compliance
The ARM55D holds CE, UL, and CSA approvals for worldwide application. These certifications confirm the unit meets stringent electrical safety requirements. Each board undergoes comprehensive factory testing prior to delivery. This quality assurance provides confidence in long-term field performance.
Details
| Weight | 1.35 kg |
|---|---|
| Dimensions | 250 × 150 × 50 mm |
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