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Yokogawa MUD*A Terminal Board

The Yokogawa MUD*A, also cataloged as the MUD*A Terminal Board, operates as a dedicated hardware component for interfacing field signals with control systems within DCS process cabinets. It provides direct electrical execution between field wiring and control modules for analog, digital, and thermocouple signals.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa MUD*A
Origin	Japan
Number of Terminals	32 screw-type terminals (supports up to 64 wire points)
Terminal Connection	Screw-type clamp
Wire Gauge Compatibility	24 AWG to 14 AWG
Rated Voltage	250 V AC/DC
Current Rating	Up to 3 A per terminal
Dimensions	Approximately 100 mm × 75 mm × 25 mm
Net Weight	200 g to 1.3 kg (model dependent)
OperatingTemp	–20 degC to 60 degC
Humidity Range	10% to 95% RH, non-condensing
Vibration Resistance	0.5 mm P-P (0–14 Hz), 2 m/s² (14–100 Hz)
Shock Resistance	5 g for 11 ms
Power Consumption	Passive component, negligible

Process Control Connectivity

• Supports 4-20 mA HART loop protocol for analog signal transmission.
• Provides channel-to-channel isolation to minimize interference between analog and digital signals.
• Compatible with FOUNDATION Fieldbus and Profibus PA networks for integrated process control.
• Cold junction compensation (CJC) included for thermocouple signal accuracy.

Frequently Asked Questions

Q: Does the MUD*A support hot-swappable modules?
A: The terminal board itself is not designed for hot-swap operation; field wiring must be de-energized before replacement.

Q: Can multiple signal types be connected on a single terminal?
A: Each terminal supports one connection type. Analog, digital, and thermocouple signals must be separated according to wiring guidelines.

Q: Are firmware updates required for the terminal board?
A: The MUD*A is a passive hardware interface; no firmware updates are applicable.

Field Installation Guidelines

1. Mount the terminal board securely within the control cabinet using standard screws or DIN-rail fixtures.
2. Maintain separation of analog and digital wiring to prevent crosstalk.
3. Properly torque all screw terminals to ensure electrical integrity without damaging wire strands.
4. Ground the shielded cables at one point only to reduce loop currents.
5. Avoid routing high-current power lines adjacent to sensitive signal wires to minimize EMI.
6. Verify signal polarity and continuity before energizing the system.

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