ARM55D Yokogawa CENTUM VP Datasheet & Technical Manual

Yokogawa ARM55D CENTUM VP 32-Point Relay Output Board

Yokogawa ARM55D CENTUM VP 32-Point Relay Output Board

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Yokogawa ARM55D Relay Output Board The Yokogawa ARM55D-00, also cataloged as the ARM55D Relay Output Board, operates as a dedicated...

SKU: ARM55D

Manufacturer: Yokogawa
Product No.: ARM55D
Product Type: Relay Output Boards
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 2200g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa ARM55D Relay Output Board

The Yokogawa ARM55D-00, also cataloged as the ARM55D Relay Output Board, operates as a dedicated hardware component for converting controller output signals into dry contact physical switching within Yokogawa CENTUM VP and FIO node platforms. It provides direct electrical driving of inductive solenoid coils, motor contactors, and indicator circuits while isolating internal system logic from field-side electrical surges.

Suffix Breakdown & Model Matrix

ARM55D: Base 32-channel mechanical relay output board platform equipped with M4 screw field terminals
-0: Standard functional hardware code (always designated as 0)
0: Standard 19-inch rack-mountable chassis structure

Hardware Specifications

Parameter	Specification
Model	ARM55D-00
Brand	Yokogawa
Origin	Japan
Weight	2.2 kg
Dimensions	48.2 cm x 18.4 cm x 13.2 cm
Operating Temp	-10 deg C to +55 deg C
Power Consumption	18 W maximum (with all 32 relays fully energized)
Operating Voltage	24 VDC (+/- 10%)
Channel Count	32 discrete relay output points (Form C / SPDT)
Contact Rating	250 VAC / 30 VDC at 5 A per channel
Initial Contact Resistance	50 mohm maximum
Insulation Resistance	10 Mohm minimum at 500 VDC
Switching Response Time	12 ms maximum (energize), 8 ms maximum (de-energize)
Mechanical Endurance	20,000,000 operations minimum
Field Wiring Terminals	M4 screw terminal blocks
Mounting Format	Standard 19-inch rack mounting chassis

4-20 mA HART Loop and Channel-to-Channel Isolation Characteristics

The ARM55D board incorporates high-integrity galvanic isolation via mechanical relay contacts between field-side load circuits and internal backplane control electronics. This physical air-gap barrier suppresses common-mode noise and prevents inductive switching spikes from coupling into adjacent low-level 4-20 mA HART loop protocol lines or sensitive analog cables running within the same marshalling cabinet. Channel isolation maintains system ground separation, preventing field ground loops from compromising controller bus stability.

Frequently Asked Questions

Q: What power capacity must technicians allow for when sizing the 24 VDC field supply for the ARM55D?

A: Engineers must size the auxiliary 24 VDC power source to deliver at least 18 W (or 750 mA) continuously to cover the coil load when all 32 output channels energize simultaneously.

Q: Can maintenance crews perform channel troubleshooting without external measurement equipment?

A: Yes, maintenance personnel can verify state changes instantly because 32 channel-dedicated LED status indicators on the board faceplate display the ON/OFF actuation state of each individual relay coil.

Q: What steps protect the relay contacts when switching highly inductive loads such as solenoid valves?

A: Technicians must wire external snubber networks or flyback diodes directly across the inductive field load to absorb voltage spikes and prevent contact welding or erosion.

Field Installation Guidelines

Technicians must mount the ARM55D chassis securely into a standard 19-inch rack frame using four dedicated mounting screws. Install the board inside a clean control enclosure that maintains ambient temperatures between -10 deg C and +55 deg C with non-condensing relative humidity below 85%. Strip field conductors to length and secure them under the M4 terminal screws, tightening each screw firmly to establish a low-resistance physical contact. Route external high-current AC or DC load wiring through separate wire troughs, keeping them apart from low-voltage analog cables and communication buses. Connect the main ground lug on the chassis to the cabinet earthing bar using a heavy copper braid strap to ensure continuous shielding against electromagnetic field interference.

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