Overview
Key Features
- Provides 16 isolated analog output channels.
- Supports 4-20 mA current signals.
- Handles load resistance from 0 to 750 ohm.
- Detects open circuits at 0.65 mA or less.
- Supports individual fallback settings for each channel.
- Provides a 10 ms data refresh cycle and 100 ms step response time.
- Supports pressure clamp terminals and MIL connector cables.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | NFAI543-S50 |
| Brand | Yokogawa |
| Product Type | Isolated Analog Output Module |
| Number of Output Channels | 16 |
| Output Signal | 4-20 mA |
| Channel Isolation | Isolated |
| Withstanding Voltage | 1,500 V AC for 1 minute (output to system) |
| Allowable Load Resistance | 0 to 750 ohm |
| Circuit-Open Detection | 0.65 mA or less |
| Accuracy | +/-0.3% of full scale |
| Data Refresh Cycle | 10 ms |
| Output Step Response Time | 100 ms |
| Output Fallback | Configurable per channel |
| Temperature Drift | Max. +/-0.01%/deg C |
| Maximum Current Consumption | 230 mA at 5 V DC |
| Maximum Current Consumption | 540 mA at 24 V DC |
| Weight | 0.4 kg |
| External Connection | Pressure clamp terminal or MIL connector cable |
Analog Output and Channel Control
The NFAI543-S50 provides 16 independent current output channels. Each channel sends a 4-20 mA signal to a connected field device, such as a control valve or other current-operated device. The receiving circuit must stay within the specified 0 to 750 ohm load range.
In addition, the module supports circuit-open detection at 0.65 mA or less. Its +/-0.3% full-scale accuracy and 100 ms step response time define the output performance during normal operation and signal changes.
Output Fallback Function
The module supports two fallback modes: HOLD and SETV. HOLD keeps the output at its last value when the module detects a fault. SETV sends a predefined output value instead. Users can select the fallback mode for each channel, while the module also supports enabling or disabling the fallback function.
The specified fallback detection time is 4 seconds. Therefore, users should consider this response time when setting field device behavior and fault-handling requirements.
Power Supply and Connection Options
The module has two specified power consumption ratings: 230 mA at 5 V DC and 540 mA at 24 V DC. The 24 V DC supply serves the analog field power supply terminal of the power supply module. Check both supply requirements when planning the I/O configuration.
For external wiring, the module supports pressure clamp terminals and MIL connector cables. Yokogawa also provides optional terminal blocks and a connector cover to match different wiring arrangements.
Ordering Codes and Configuration
The NFAI543 product family uses suffix codes to identify communication and hardware options.
| Code | Specification |
|---|---|
| -S | Standard type |
| -H | With HART communication |
| 5 | Without explosion protection |
| E | With explosion protection |
| 0 | Basic type |
| 1 | With ISA Standard G3 option |
Available option codes:
| Option Code | Specification |
|---|---|
| /A4S00 | Pressure Clamp Terminal Block for Analog, NFTA4S-00 |
| /A4S10 | Pressure Clamp Terminal Block for Analog with Surge Absorber, NFTA4S-10 |
| /CCC01 | Connector Cover for MIL Cable, NFCCC01 |
The NFAI543-S50 identifies the standard type without explosion protection and with the basic configuration. For HART communication, select the -H suffix instead of -S.
Frequently Asked Questions
Q: How many analog output channels does the NFAI543-S50 provide?
A: It provides 16 isolated channels, each with a 4-20 mA current output. Each channel can supply a separate signal to a field device.
Q: Can each channel use a different output fallback setting?
A: Yes. The module supports HOLD and SETV modes, with settings for each channel. HOLD retains the last output value, while SETV sends a predefined value after fault detection.
Q: Does the NFAI543-S50 support HART communication?
A: The supplied -S suffix identifies the standard version. Yokogawa lists the -H suffix for the HART communication version, so select the appropriate suffix when specifying the module.
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