Yokogawa MRO-234*A SPDT Relay Output Module
The Yokogawa MRO-234*A , also cataloged as the MRO-234*A SPDT Relay Output Module, operates as a dedicated hardware component for contact switching and discrete load actuation within Yokogawa process control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MRO-234*A |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.5 kg |
| Dimensions | 99 x 100 x 40 mm |
| Operating Temp | -10 deg C to +60 deg C |
| Power Consumption | Backplane logic bus powered |
| Module Type | SPDT Relay Output |
| Output Contact Type | Single Pole Double Throw (SPDT) |
DCS Signal Conditioning & Field Loop Protocol Features
The MRO-234*A SPDT relay output module provides physical contact isolation between system logic and field-side electrical circuits. High-density relay contacts execute discrete switching signals sent from downstream controllers, isolating delicate backplane logic circuits from field line transients, inductive kickback, and electrical noise. Engineered for process interlocks and alarm outputs, the module integrates with Yokogawa DCS architecture and supports auxiliary contact monitoring across 4-20 mA HART loop protocol instrument networks and discrete motor control circuits.
Frequently Asked Questions
Q: What type of contact architecture does the MRO-234A relay module utilize?
A: The MRO-234A uses Single Pole Double Throw (SPDT) dry contacts, providing both Normally Open (NO) and Normally Closed (NC) terminals for each output channel.
Q: Is external power required to actuate the internal relay coils on the MRO-234*A?
A: Relay coil power is drawn directly from the system backplane power bus, while field load voltages must be supplied separately across the relay contacts.
Field Installation Guidelines
- De-energize all field load power sources and system backplane supplies prior to inserting or removing the MRO-234*A module.
- Verify terminal block screw tightness and ensure proper engagement on the mounting rail to maintain solid chassis ground continuity.
- Use suppression diodes or RC snubbers across inductive field loads (such as solenoid valves or contactor coils) to prevent contact arcing.
- Route low-voltage field signal wiring separately from high-voltage relay output wiring to minimize electromagnetic interference.
Yokogawa MRO-234*A SPDT Relay Output Module
Yokogawa MRO-234*A SPDT Relay Output Module
The Yokogawa MRO-234*A , also cataloged as the MRO-234*A SPDT Relay Output Module, operates as a dedicated hardware component for contact switching and discrete load actuation within Yokogawa process control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MRO-234*A |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.5 kg |
| Dimensions | 99 x 100 x 40 mm |
| Operating Temp | -10 deg C to +60 deg C |
| Power Consumption | Backplane logic bus powered |
| Module Type | SPDT Relay Output |
| Output Contact Type | Single Pole Double Throw (SPDT) |
DCS Signal Conditioning & Field Loop Protocol Features
The MRO-234*A SPDT relay output module provides physical contact isolation between system logic and field-side electrical circuits. High-density relay contacts execute discrete switching signals sent from downstream controllers, isolating delicate backplane logic circuits from field line transients, inductive kickback, and electrical noise. Engineered for process interlocks and alarm outputs, the module integrates with Yokogawa DCS architecture and supports auxiliary contact monitoring across 4-20 mA HART loop protocol instrument networks and discrete motor control circuits.
Frequently Asked Questions
Q: What type of contact architecture does the MRO-234A relay module utilize?
A: The MRO-234A uses Single Pole Double Throw (SPDT) dry contacts, providing both Normally Open (NO) and Normally Closed (NC) terminals for each output channel.
Q: Is external power required to actuate the internal relay coils on the MRO-234*A?
A: Relay coil power is drawn directly from the system backplane power bus, while field load voltages must be supplied separately across the relay contacts.
Field Installation Guidelines
- De-energize all field load power sources and system backplane supplies prior to inserting or removing the MRO-234*A module.
- Verify terminal block screw tightness and ensure proper engagement on the mounting rail to maintain solid chassis ground continuity.
- Use suppression diodes or RC snubbers across inductive field loads (such as solenoid valves or contactor coils) to prevent contact arcing.
- Route low-voltage field signal wiring separately from high-voltage relay output wiring to minimize electromagnetic interference.
