Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ARM55W, ARM55T |
| Brand | Yokogawa |
| Product Type | Mechanical Relay Output Boards |
| Contact Type | Mechanical relay, wet contact for ARM55W and ARM55T |
| Output Points | 32 points |
| Switching Function | Single or dual-redundant configuration |
| Manual Switch | AUTO/OFF/ON, ARM55T only |
| Field Terminals | M4 screws |
| Compatible I/O Modules | ADV551 (32-point DO), ADV561 (64-point DO, subject to configuration compatibility) |
| Terminal Block | ATD5A |
| Connection Cables | AKB331 for 32-point; AKB337 for 64-point |
| Maximum Switching Load | 250 VAC: 0.6 A per point; 30 VDC: 0.6 A per point; 125 VDC: 0.1 A per point |
| Minimum Switching Load | 5 V, 10 mA |
| 24 VDC Power Consumption | Maximum 0.65 A |
| Power Distribution | Dual-line supply, one supply per 16 points |
| Maximum Aggregate Load | 250 VAC: 9.6 A; 30 VDC: 9.6 A; 125 VDC: 1.6 A |
| Insulation Resistance | At least 10 Mohm at 500 VDC |
| Dielectric Strength | Field terminals to case: 2 kV; 24 V power terminals to case: 500 V; 24 V power terminals to field terminals: 2 kV |
| Operating Temp | 0 to 50 deg C |
| Operating Humidity | 10 to 90% RH |
| Safety Standards | CSA (as specified in the supplied data) |
| EMC Standards | CE Marking, C-Tick Marking |
| Dimensions | W: 482.6 mm x H: 177 mm (4U) |
| Weight | 2.6 kg |
| Origin | Not specified in the supplied data |
Relay Contact Ratings and Power Distribution
The relay contacts switch field circuits within the stated voltage and current limits. The maximum permitted current depends on the applied voltage and AC or DC load type. The specified aggregate load limits also apply and must not be exceeded when multiple output points operate simultaneously.
The 24 VDC supply supports the board’s internal circuitry, with a maximum stated current consumption of 0.65 A. The dual-line arrangement distributes supply power across groups of 16 points. Confirm the wiring and supply arrangement against the applicable Yokogawa connection documentation before energizing the assembly.
Frequently Asked Questions
Q: What is the difference between ARM55W and ARM55T?
A: The supplied specifications identify an AUTO/OFF/ON switch on the ARM55T only. Verify the complete board configuration before replacement.
Q: What are the maximum relay contact ratings?
A: The stated limits are 0.6 A per point at 250 VAC, 0.6 A per point at 30 VDC, and 0.1 A per point at 125 VDC. Aggregate load limits must also be observed.
Q: Which connection accessories are listed for these boards?
A: The supplied data lists the ATD5A terminal block, AKB331 cable for 32-point connections, and AKB337 cable for 64-point connections. Confirm compatibility with the selected I/O configuration.
Field Installation Guidelines
- Verify the board model and terminal assignment against the Yokogawa wiring documentation.
- Confirm that the selected I/O module, terminal block, and connection cable match the intended point configuration.
- Keep field wiring within the specified voltage and current ratings, including aggregate load limits.
- Separate relay output wiring from low-level analog signal cables where practical to reduce electrical interference.
- Apply appropriate protective grounding to the rack or enclosure according to the system installation requirements.
- Inspect terminal screws and conductor terminations before energizing the board.
- For ARM55T, verify the AUTO/OFF/ON switch position and the required operating mode before commissioning.
- Do not assume hot-swap capability or energized replacement support without explicit confirmation in the applicable Yokogawa manual.
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