MRO-234-A Yokogawa Relay Output Module

MRO-234-A Yokogawa Relay Output Module Interface Card

Availability: 10 left in stock

Yokogawa MRO-234-A Relay Output Module Configured for discrete signal switching in CENTUM VP and CS 3000 control architectures, the Yokogawa...

SKU: MRO-234*A

Manufacturer: Yokogawa
Product No.: MRO-234*A
Product Type: Relay Output Modules
Product Origin: Japan
Payment:T/T, Western Union
Weight: 220g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa MRO-234-A Relay Output Module

Configured for discrete signal switching in CENTUM VP and CS 3000 control architectures, the Yokogawa MRO-234-A (MRO-234 Relay Output Module) provides direct physical execution of relay-based status outputs to field devices.

Suffix Breakdown & Model Matrix

Suffix Code	Description
MRO-234	Base Model: Relay Output Module
-A	Style A: Standard Relay Interface

Hardware Specifications

Parameter	Specification
Model	MRO-234-A
Brand	Yokogawa
Origin	Japan
Weight	0.22 kg
Dimensions	99 mm x 100 mm x 40 mm
Operating Temp	-20 deg C to +60 deg C
Power Consumption	20 mA per point
Contact Rating	10 A (250 VAC / 30 VDC)
Isolation	2000 Vrms (input-output)
Switching Time	5 ms (ON) / 3 ms (OFF)

DCS Process Control Connectivity

The MRO-234-A module facilitates high-isolation interfacing between DCS logic and field instrumentation. It utilizes channel-to-channel isolation to prevent potential fault propagation from external high-load circuits into the low-voltage control bus. The module ensures precise signal conditioning, maintaining the integrity of the 4-20 mA HART loop protocol when integrated into secondary control loops. Cold junction compensation (CJC) is not required for this discrete relay module; however, signal stability relies on maintaining the specified 18-30 VDC input range to ensure consistent electromagnetic coil activation within the relays.

Frequently Asked Questions

Q: Does the MRO-234-A support hot-swapping during active operation?

A: No. The MRO-234-A is designed for fixed installation. Power must be isolated from the relay board before any maintenance or module removal to prevent accidental activation of field devices or short-circuiting of the control signals.

Q: What is the recommended service life for the internal relay contacts?

A: The relay contact service life is dependent on the load characteristics (inductive vs. resistive). At the rated 10 A load, contact wear is accelerated; ensure that suppressors are utilized for inductive loads (e.g., solenoids, motors) to extend the operational life of the relay points.

Field Installation Guidelines

Mounting: Secure the module to the DIN rail or backplane. Ensure adequate clearance around the module to allow for natural convection cooling, as relay operation generates thermal energy.
Wiring: Use pressure clamp terminals for all field connections. Verify that wire gauge is appropriate for the current load to minimize resistive heating.
Grounding: Connect the module chassis ground to the cabinet's common earth bar. A low-impedance ground path is required for the internal isolation circuitry to maintain the 2000 Vrms rating.
Environment: Avoid mounting the module in areas with extreme vibration or high levels of conductive dust, which can compromise the relay contacts and enclosure integrity.

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