NFDR541-T

The Yokogawa NFDR541-T is a 16-channel digital output module designed to switch external loads using DC or AC power. It supports rated applied voltages from 24 to 125 V DC and 100 to 240 V AC at 50/60 Hz. Its configurable output fallback functions allow the module to hold existing output states, switch all channels off, or perform no fallback action when the specified trigger occurs.

Output Channels and Load Ratings

The module provides 16 output channels for controlling external loads. The maximum permissible current depends on the supply voltage and load type. Resistive and inductive loads have different current limits, so the actual load characteristics must be considered when selecting the operating conditions.

Maximum Load Current

Load Type	Supply Voltage	Maximum Current
Resistive	24 V DC	2.0 A/channel
Resistive	48 V DC	1.0 A/channel
Resistive	110 V DC	0.3 A/channel
Resistive	125 V DC	0.3 A/channel
Resistive	100 V AC	2.0 A/channel
Resistive	220 V AC	2.0 A/channel
Inductive	24 V DC	0.6 A/channel
Inductive	48 V DC	0.3 A/channel
Inductive	110 V DC	0.1 A/channel
Inductive	100 V AC	2.0 A/channel
Inductive	220 V AC	1.0 A/channel

The DC inductive-load voltage range is limited to 24-110 V DC. When driving a DC relay, a diode must be connected to the load circuit. The maximum current permitted per common is 8 A, and AC signals connected to the same common must use the same phase.

Output Fallback and Status Functions

The module provides an ON/OFF status output function and three selectable fallback behaviors:

• HOLD: Maintains the current output states when fallback is triggered.
• OFF: Resets all output channels to OFF.
• NO: Performs no fallback action.

The fallback detection time is 4 seconds. The same fallback selection must be applied to all channels rather than configured independently for individual outputs.

Electrical Isolation and Connections

The output signals are isolated from the system, with a withstand voltage of 2000 V AC for 1 minute between the output signal and the system. The withstand voltage between commons is 1350 V AC for 1 minute, with one common shared by each group of eight channels.

External wiring uses pressure clamp terminals. This connection method provides direct field-wire termination for the relay output circuits.

Technical Specifications

Parameter	Specification
Model	NFDR541-T
Brand	Yokogawa
Product Type	16-Channel Relay Output Module
Number of Output Channels	16
Rated Applied Voltage	24 to 125 V DC; 100 to 240 V AC, 50/60 Hz
Output Response Time	12 ms or less (status output)
Withstand Voltage (Output to System)	2000 V AC, 1 minute
Withstand Voltage (Between Commons)	1350 V AC, 1 minute
Common Configuration	One common per 8 channels
Maximum Current per Common	8 A
Fallback Detection Time	4 seconds
Fallback Modes	HOLD, OFF, NO
Maximum Current Consumption	780 mA at 5 V DC
External Connection	Pressure clamp terminal
Weight	0.3 kg
RoHS Compliance	Compliant for NFDR541-T version

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Frequently Asked Questions

Q: What is the difference between NFDR541-P and NFDR541-T?

A: The NFDR541-T version complies with RoHS requirements, whereas the NFDR541-P version is identified as non-RoHS compliant in Yokogawa's general specifications. The suffix should therefore be checked when selecting a replacement module.

Q: Can all 16 output channels be loaded to their individual maximum current ratings simultaneously?

A: Not necessarily. The maximum current per common is 8 A, so the combined load on each eight-channel common must remain within this limit, even when individual channel ratings are higher.

Q: Can the HOLD and OFF fallback modes be configured separately for different channels?

A: No. The selected fallback behavior applies commonly to all output channels. HOLD maintains the current states, while OFF resets all outputs to OFF.

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