NFAI543-S50 4-20mA Output – 16 Isolated Channels with HART | Yokogawa

Product Overview

• NFAI543-S50 – isolated analog output module from Yokogawa
• Delivers 4 to 20 mA signals across 16 channels
• Ideal for precision control in industrial automation
• High accuracy: ±0.3% of full scale
• Fast refresh cycle: 10 ms; step response: 100 ms
• HART communication ready (see GS 34P02Q53-01E)
• Wide operating temp range: 0…55 °C (per Yokogawa standard)
• Compact, lightweight – only 0.4 kg

Key Features

• 16 isolated channels – eliminates ground loops
• Output fallback – HOLD or SETV per channel
• Circuit‑open detection – ≤0.65 mA
• Wide load range – 0 to 750 Ω
• HART communication – for smart device integration
• High isolation – 1500 V AC (output to system)

Technical Specifications

• Brand – Yokogawa
• Model – NFAI543-S50
• Series – NFAI (Analog I/O)
• Type – Isolated analog output module
• Output channels – 16 (isolated)
• Output signal – 4 to 20 mA
• Accuracy – ±0.3% of full scale
• Load resistance – 0 to 750 Ω
• Data refresh – 10 ms
• Step response – 100 ms
• Circuit‑open detection – 0.65 mA or less
• Temperature drift – ≤±0.01%/°C
• Isolation voltage – 1500 V AC (1 min)
• Current consumption – 230 mA (5 V DC), 540 mA (24 V DC)
• Weight – 0.4 kg
• External connection – pressure clamp terminal or MIL cable
• HART – supported (refer to GS 34P02Q53-01E)
• Fallback – HOLD or SETV per channel

Installation & Wiring

• Mount – install in compatible Yokogawa rack
• Power – supply 24 V DC to analog field power terminal
• Wiring – use pressure clamp or MIL connector cable
• Cable – KMS40 cable (500 V AC isolation if used)
• Grounding – connect shield to reduce noise
• Check – verify load resistance (0‑750 Ω) before power‑up

Maintenance & Diagnostics

• Status LED – indicates channel health and alarms
• Fallback detection – 4 seconds to trigger
• No calibration needed – factory‑set accuracy
• Cleaning – use dry cloth; avoid moisture
• Firmware – update via system controller (if supported)

Compatibility

• Systems – Yokogawa CENTUM VP, ProSafe‑RS, and others
• Power supply – requires 24 V DC field power supply
• Cables – use KMS40 or equivalent MIL cable
• Software – HART configuration via dedicated tools

Certifications & Standards

• CE – European conformity
• UL – recognized component
• CSA – certified for Canadian use
• RoHS – compliant
• Isolation – 1500 V AC (1 min) between output and system

Package Contents

• 1× NFAI543-S50 output module
• 1× pressure clamp terminal (pre‑installed)
• Quick start guide (paper)
• Warranty registration card

Warranty & Delivery

• 12‑month warranty – covers manufacturer defects
• 12‑24 hour dispatch – ships within one business day
• Carriers – FedEx, UPS, DHL (tracking provided)
• Free technical support via phone/email

Expert Review

• High channel density – 16 channels in a single module
• Reliable isolation – 1500 V AC ensures safety
• Fast response – 100 ms step response for dynamic control
• HART capability – adds intelligence to field devices

Manager’s Insight

• Best for – process control, chemical plants, power generation
• Reduces wiring – high channel count saves space
• Fallback feature – improves system safety during faults
• Low drift – ±0.01%/°C ensures stable output

Typical Applications

• Flow control (valve positioners)
• Pressure regulation
• Temperature control loops
• Level control systems
• Chemical dosing

Frequently Asked Questions

• What does “isolated” mean for this module?
• Each output channel has electrical separation from the system to prevent ground loops.
• Can I use this module without HART?
• Yes. The module works as a standard 4‑20 mA output even without HART.
• What is the fallback detection time?
• 4 seconds. After that, the module holds or sets a specified value.
• Is the MIL cable included?
• No. You need to order the KMS40 cable separately.
• What voltage does the module need?
• It needs 5 V DC (230 mA) and 24 V DC (540 mA) from the system.
• How do I set fallback values?
• You configure HOLD or SETV per channel using the system engineering tool.
• What is the maximum load resistance?
• 750 Ω. Higher loads may cause output errors.
• Can I mount it in a vertical rack?
• Yes. The module works in any standard Yokogawa rack orientation.

Selection Guide

• Channel count – choose this module if you need 16 analog outputs.
• Load resistance – ensure your field devices are within 0‑750 Ω.
• HART – if you need HART, use this module (check GS 34P02Q53-01E).
• Isolation – choose isolated modules for noisy environments.
• Fallback – if safety is critical, enable fallback and set HOLD/SETV.

Comparison with Similar Models

• NFAI543-S – standard type, no explosion protection
• NFAI543-S50 – same as above with MIL connector support
• NFAI543-S15 – with explosion protection (ATEX)
• NFAI544-S50 – 8‑channel version for smaller applications

Contact & Support

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825
• Technical support available 24/5

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