NFAI543-500/A4500

The Yokogawa NFAI543-500/A4500 is identified as an NFAI543-series analog output module for generating 4-20 mA current signals. The NFAI543 hardware supports 16 isolated output channels, allowing a controller to transmit individual analog command signals to external control devices. Its output architecture includes digital-to-analog conversion and isolation between the controller circuitry and field-side signals.

Output Configuration and Signal Isolation

Each of the 16 channels generates an independent 4-20 mA analog output. The controller supplies digital output values, which the module converts into corresponding current signals through its internal D/A conversion circuitry.

The isolated design separates the field-side output circuitry from the controller-side electronics. This helps limit the influence of electrical potential differences between the field wiring and internal control circuits.

Field Wiring and Power Requirements

The NFAI543 uses a 40-pin MIL connector. Yokogawa documentation also identifies the NFTA4S pressure-clamp terminal block as the applicable terminal-block interface for this module.

A 24 V DC supply must be connected to the analog field power supply terminal of the power supply module for NFAI543 operation. This field-side supply requirement should be checked separately from the system power supply when planning cabinet wiring.

The wiring arrangement provides separate positive and negative terminals for each output channel. The installation guide identifies the channel terminals as OUT1+ and OUT1- through OUT16+ and OUT16-, with corresponding MIL connector pin assignments.

Technical Specifications

Parameter	Specification
Model	NFAI543-500/A4500
Brand	Yokogawa
Product Type	Analog Output Module
Module Family	NFAI543
Output Channels	16
Output Signal	4-20 mA DC
Channel Isolation	Isolated
Conversion	Digital-to-Analog (D/A)
Connector	40-pin MIL connector
Compatible Terminal Block Type	NFTA4S
Analog Field Power Supply	24 V DC required

Frequently Asked Questions

Q: How many independent analog signals can the NFAI543 provide?

A: The module supports 16 analog output channels. Each channel provides a 4-20 mA current signal for an external receiving device.

Q: Does the NFAI543 require an external field power supply?

A: Yes. A 24 V DC supply must be provided to the analog field power supply terminal of the power supply module. This requirement should be considered when checking the controller power configuration.

Q: What terminal block is used with the NFAI543?

A: Yokogawa identifies the NFTA4S pressure-clamp terminal block as the applicable terminal-block type. The alternative connection arrangement uses a 40-pin MIL connector.

---