RM81*A Yokogawa CENTUM VP Datasheet & Technical Manual

Yokogawa RM81-A CENTUM VP Relay Output Module RM81*A

Yokogawa RM81-A CENTUM VP Relay Output Module RM81*A

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YOKOGAWA RM81*A Relay Output Module The YOKOGAWA RM81*A serves as the primary RM81-A Relay Output Module utilized to execute discrete...

رمز المنتج: RM81*A

Manufacturer: Yokogawa
Product No.: RM81*A
Product Type: Relay Output Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 350g
Shipping port: Xiamen
Warranty: 12 months

وصف التقييمات

YOKOGAWA RM81*A Relay Output Module

The YOKOGAWA RM81*A serves as the primary RM81-A Relay Output Module utilized to execute discrete output signals across CENTUM VP platforms. The module manages physical contact state changes to actuate interlocks, alarms, and external field devices via discrete dry contact interfaces. Integrated diagnostic circuits track electrical execution status directly through localized light-emitting diodes (LEDs) positioned on the faceplate assembly, enabling localized verification of channel transitions and coil status without interruption to the primary controller communication backplane.

Hardware Specifications

Parameter	Specification
Model	RM81*A (RM81-A / RM81A)
Brand	Yokogawa
Origin	Japan
Weight	0.35 kg
Dimensions	120 x 25 x 130 mm
Operating Temp	0 to 60 deg C
Power Consumption	5 VDC, 1.2 A
System Compatibility	CENTUM VP, CS 3000, CENTUM XL, MICRO XL
Channels	8 relay output channels
Output Type	Dry contact relay outputs
Contact Rating	24 VDC / 2 A, 120 VAC / 2 A
Isolation	1500 VAC (channel-to-system, 1 min)
Diagnostics	LED indicators for channel ON/OFF and fault
Redundancy	Dual-redundant operation supported
Humidity Range	5 to 95% RH, non-condensing
Mounting	Rack-mounted (FCU slot)
Certifications	CE, UL, RoHS compliant

DCS Process Control & Analog Loop Execution

The YOKOGAWA RM81*A provides structured galvanic isolation rated at 1500 VAC for 1 minute between the internal low-voltage logic bus and the external electrical field connections. To maintain total signal loop integrity within multi-channel environments, the module enforces structural channel-to-channel isolation that limits noise coupling and blocks voltage spikes from passing backwards into the main processing core. Integrated circuit layouts suppress transient contact arcing during high-frequency switching operations, preserving the linearity and response thresholds of associated 4-20 mA HART loop protocol instruments operating within the same enclosure architecture.

Frequently Asked Questions

Q: How does the module handle output state transitions during a primary processor failure in a dual-redundant configuration?

A: The module utilizes dual-redundant control paths routed through the FCU slot backplane. When the primary control node drops its active transmission sequence, the tracking secondary module matches the contact states within strict millisecond parameters, keeping the dry contacts closed or open without dropping the field load.

Q: What are the installation restrictions concerning the hot-swap function for this module?

A: Hot-swapping requires the redundant partner card to be fully online and displaying normal status indications. The field technician must ensure that no active interlock loops are cycling during the extraction phase to prevent spurious trips caused by mechanical contact bounce.

Q: Why does the technical data sheet reflect alternative mechanical weight parameters?

A: The standard base module weight sits at approximately 0.35 kg when installed as a bare board within the card cage. Sub-assembly variations that incorporate heavy-duty field terminal adapters or integrated mounting brackets increase the net mass to approximately 1.25 lbs (~0.57 kg).

Field Installation Guidelines

Slot Insertion: Align the module frame with the dedicated vertical slots of the FCU rack. Press the card firmly until the backplane pins are fully engaged, and secure the mechanical locking tabs to prevent vibration-induced displacement.
Shield Terminations: Connect all external control loop shields to the designated instrumental grounding bar of the enclosure. Ensure that no loop shields are tied to ground at multiple locations to avoid circulating currents.
Separation of Cables: Route the discrete relay terminal wires through separate conduits away from high-voltage motor starters and low-voltage analog signal cables to maintain electromagnetic compatibility.
Thermal Boundaries: Maintain clear spatial margins at the ventilation intake paths of the rack chassis. Ensure cabinet cooling parameters keep the internal temperature below 60 deg C to mitigate thermal fatigue on the relay coils.

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