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Yokogawa MUD*A General-Purpose Terminal Board
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- Part Number: MUD*A
- Brand: Yokogawa
- Type: General-Purpose Terminal Board
- Dimensions: 3.3x10.7x13cm
- Country of Origin: Japan
- Barcode: 8537101190
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Additional Specifications
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Product Description
The Yokogawa MUD*A (commonly referenced as the MUD*A or MUD-A) operates as a general-purpose, rack-mounted terminal board within Yokogawa’s industrial automation platforms, such as CENTUM distributed control systems (DCS). It serves as a centralized mechanical and electrical marshaling hub natively at the marshalling tier to bridge field instrumentation wiring with high-density I/O modules, maintaining transparent signal propagation parallel to master processor network execution cycles.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MUD*A (e.g., MUD-A*A) |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 1.3 kg (2.87 lbs) |
| Terminal Density | 32 terminal channels (Dual connection points supporting up to 64 conductors) |
| Termination Connection | Heavy-duty, industrial M4 screw-type terminal blocks |
| Supported Wire Gauges | 24 AWG to 14 AWG ($0.2 \text{ mm}^2$ to $2.0 \text{ mm}^2$) |
| Maximum Current | 3 A continuous per individual terminal |
| Maximum Voltage | 250 V AC/DC operational thresholds |
| Operating Temp | -20°C to +60°C (-4°F to +140°F) |
| Relative Humidity | 10% to 95% RH (non-condensing boundaries) |
| Vibration Resistance | ≤ 0.5 mm P-P (0 to 14 Hz), ≤ 2 $\text{m/s}^2$ (14 to 100 Hz) |
| Mechanical Shock Limits | 5 g or less for an 11 ms pulse duration |
Substation & Marshalling Architecture
- High-Density Channel Routing: The terminal board distributes up to 64 individual field conductors across 32 isolated dual-point terminal blocks. This architecture allows simultaneous marshalling of diverse industrial telemetry, including 4-20 mA analog loops, discrete digital sensor lines, and thermocouple reference joints.
- Galvanic Circuit Integrity and Environmental Protection: Built into a heavy, rigid mounting frame, the structural backplane uses robust physical spacing to isolate neighboring terminal groups. This layout mitigates channel-to-channel crosstalk and protects logic loops from high-potential common-mode surges typical in industrial control cabinets.
- Interconnect Cable Compatibility: The assembly links directly to backend Yokogawa I/O racks using pre-fabricated, multi-core shielded interface cables. This design eliminates field point-to-point wiring lag, protecting high-resolution analog-to-digital converters from noise induction.
Frequently Asked Questions
Q: What specific hardware failure states manifest if a terminal screw on the MUD*A is over-torqued beyond specification limits?
A: Over-torquing strips the internal brass threading or deforms the pressure plate assembly. This creates a high-resistance localized connection, causing thermal heat-soak anomalies, intermittent signal attenuation, or complete physical conductor shearing during high-vibration events.
Q: Can field conductors be landed on the MUD*A terminal board while the associated DCS I/O module rack is live and actively scanning loops?
A: Yes, the board is entirely passive. However, technicians must verify that the individual field loops are isolated or unpowered before landing wires to prevent introducing unexpected field shorts or voltage spikes that could damage backend digital acquisition circuits.
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