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Yokogawa NFDV551-P60 Digital Output Module

The Yokogawa NFDV551-P60, also cataloged as the NFDV551 Digital Output Module, operates as a dedicated hardware component for discrete signal switching across STARDOM/FIO subsystem platforms. It provides isolated current-sink outputs for direct electrical execution of field devices such as solenoid valves, relays, and indicator lamps.

Hardware Specifications

Parameter	Specification
Model/Brand	NFDV551-P60 / Yokogawa
Origin	Japan
Number of Output Channels	32
Rated Applied Voltage	24 V DC
Field Power Supply Voltage Range	20.4 to 26.4 V DC
Load Voltage / Current	24 V DC, 50 mA per channel
Maximum Load Current	100 mA per channel at 26.4 V DC
Output ON Voltage (Max)	2 V DC
Leakage Current (OFF)	0.1 mA max
Output Format	Current sink (open collector)
Output Response Time	≤ 3 ms
Maximum Current Consumption	700 mA @ 5 V DC (system), 60 mA @ 24 V DC (field)
Weight	0.2 kg
Dimensions	Approx. 90 × 60 × 30 mm
Operating Temperature	-40 degC to +80 degC
External Connection	Pressure clamp terminal or MIL connector cable

Process Control/DCS Features

• Channel-to-channel isolation ensures electrical separation between outputs, minimizing cross-talk in dense I/O arrays.
• Compatible with 4-20 mA HART loop monitoring and can interface with FOUNDATION Fieldbus or Profibus PA via STARDOM/FIO controllers.
• Cold junction compensation (CJc) supported for accurate diagnostics when used with temperature-sensitive output devices.

Frequently Asked Questions

Q: Can the module be hot-swapped?
A: The NFDV551-P60 is not designed for live backplane insertion. Ensure the system power is off before replacing modules.

Q: What is the maximum load per channel?
A: Each channel supports up to 100 mA at 26.4 V DC; exceeding this may damage the module.

Q: How is output fallback handled?
A: The module supports HOLD (retain last state), OFF (force outputs off), or NO (no action) configurations during communication loss.

Field Installation Guidelines

• Mount modules securely in a STARDOM/FIO-compatible rack with appropriate clearance for heat dissipation.
• Ensure field wiring is routed to avoid EMI interference; shielded twisted pair is recommended for long runs.
• Connect the system and field power supplies according to polarity markings; confirm voltage ranges.
• Verify that all common lines are correctly grouped to maintain proper isolation.
• Do not exceed terminal torque specifications; over-tightening can damage pressure clamp terminals.
• Use MIL connectors only if cable routing requires flexible connection; maintain proper grounding to prevent signal leakage.

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