Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ARM55C |
| Brand | Yokogawa |
| Product Type | Mechanical Relay Output Board |
| Weight | Approx. 2.2 kg |
| Dimensions | 482.6 mm W x 132.5 mm H |
| Mounting | 19-inch rack, 3U height |
| Operating Temp | 0 to 50 deg C |
| Operating Humidity | 10% to 90% RH, non-condensing |
| Power Consumption | 24 VDC supply; maximum current consumption 0.65 A |
| Number of Channels | 32 relay output channels |
| Contact Type | Dry contacts |
| Contact Configuration | Normally open (NO, a contact) or normally closed (NC, b contact), subject to board configuration |
| Maximum Contact Load | 250 VAC at 2 A per point; 30 VDC at 2 A per point; 125 VDC at 0.1 A per point |
| Minimum Load | 5 VDC, 10 mA |
| Insulation Resistance | At least 10 Mohm at 500 VDC |
| Dielectric Withstand Voltage | Field terminals to case: 2 kVAC for 1 minute |
| Dielectric Withstand Voltage, Power Circuit | 24 V power terminals to case: 500 VAC for 1 minute |
| Dielectric Withstand Voltage, Power to Field | 2 kVAC for 1 minute |
| Signal Cable References | AKB331 for 32-point configuration; AKB337 for 64-point system setups, subject to system compatibility |
| Compatible Digital Output Modules | ADV551 and ADV561, subject to the applicable system configuration |
| Compliance | CE, C-Tick (RCM), and KC markings stated in the supplied data |
Relay Contact Switching and DCS Interface
The ARM55C uses mechanical relay contacts to switch external field circuits. The dry-contact interface allows the control system output to operate a connected load without treating the relay contact as an internally generated field voltage.
Contact selection determines whether the circuit uses a normally open or normally closed contact arrangement. Verify the terminal assignment and board configuration before connecting field wiring.
For process-control installations, distinguish relay contact switching from analog instrumentation functions. The ARM55C is a relay output board; the supplied specifications do not identify it as a 4-20 mA HART interface or a FOUNDATION Fieldbus or Profibus PA communication device.
The maximum load rating varies with the applied voltage. In particular, the stated 125 VDC rating is limited to 0.1 A per point and must not be treated as equivalent to the 2 A ratings at 30 VDC or 250 VAC.
Frequently Asked Questions
Q: What is the output capacity of the ARM55C?
A: The supplied data specifies 32 mechanical relay output channels with dry contacts. Each contact must operate within the stated voltage and current limits.
Q: Can the ARM55C switch both AC and DC loads?
A: The listed ratings include 250 VAC at 2 A per point, 30 VDC at 2 A per point, and 125 VDC at 0.1 A per point. Confirm the load type and electrical characteristics before connection.
Q: Can the ARM55C be used with an ADV561 digital output module?
A: The supplied information lists the ADV561 as a compatible module and references two relay boards for a 64-channel setup. Confirm the exact hardware revision, cable arrangement, and system configuration against the applicable Yokogawa documentation.
Field Installation Guidelines
- Rack mounting: Install the board in the designated 19-inch rack position. Confirm the available 3U mounting space and secure the assembly according to the equipment instructions.
- Power connection: Verify the 24 VDC supply polarity and voltage before energizing the board. Check that the supply can support the stated maximum current consumption of 0.65 A.
- Field wiring: Identify each relay terminal from the applicable terminal diagram. Keep field wiring organized and separated from sensitive analog signal wiring where required by the installation design.
- Contact loading: Check both the load voltage and current against the rating for the applicable AC or DC circuit. Consider inductive load characteristics and provide suitable external suppression where required.
- Grounding and shielding: Follow the system grounding plan. Terminate cable shields according to the applicable installation documentation and avoid creating unintended ground loops.
- Insulation and safety: Isolate power before wiring or servicing. Maintain the required electrical clearances and verify field circuit insulation before commissioning.
- Functional verification: Test the commanded relay states and confirm the expected normally open or normally closed behavior before connecting the board to operating field equipment.
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