Overview
Key Features
- 8-channel analog input: Receives 4-20 mA signals from connected field devices.
- Isolated channels: Provides electrical isolation between individual input channels and between the input circuits and the system.
- Signal protection: Includes overcurrent protection and supports an allowable input current of 25 mA.
- Measurement accuracy: Provides an accuracy of +/-0.1% of full scale.
- Fast data acquisition: Supports a 10 ms data refresh cycle and a 100 ms input step response time.
- HART configuration: HART communication is available for the applicable module configuration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | NFAI135-S00 (model identification requires confirmation) |
| Brand | Yokogawa |
| Product Type | Analog Input Module |
| Number of Channels | 8 |
| Channel Configuration | Isolated channels |
| Input Signal | 4-20 mA |
| Allowable Input Current | 25 mA |
| Overcurrent Protection | Provided |
| Input Resistance (Power ON) | 250 ohm |
| Input Resistance (Power OFF) | 500 kohm or more |
| Withstanding Voltage | 500 V AC for 1 minute |
| Isolation | Between input and system; between channels |
| Accuracy | +/-0.1% of full scale |
| Data Refresh Cycle | 10 ms |
| Input Step Response Time | 100 ms |
| Transmitter Power Supply | 20.2-29.3 V |
| Temperature Drift | Max. +/-0.01%/deg C |
| Maximum Current Consumption (5 V DC) | 360 mA |
| Maximum Current Consumption (24 V DC) | 450 mA |
| External Connection | Pressure clamp terminal, MIL connector cable |
| Weight | 0.3 kg |
Input Signal and Channel Isolation
The NFA1135 series analog input module receives 4-20 mA signals from field transmitters and converts the current measurements into input data for the control system. Its eight input channels operate with individual channel isolation, separating field signal circuits from one another.
The specified 500 V AC withstand voltage for one minute applies both between the input circuits and the system and between individual channels. This isolation arrangement helps limit the electrical interaction between connected signal circuits.
Signal Acquisition and Protection
The module has a 10 ms data refresh cycle and a 100 ms input step response time. These specifications describe its data update interval and response to changes in the input current, respectively. The +/-0.1% full-scale accuracy defines its specified measurement accuracy.
An input resistance of 250 ohm applies when the module is powered on. When power is off, the input resistance is specified as 500 kohm or more. Overcurrent protection is also provided, with an allowable input current of 25 mA.
Ordering Configuration
The supplied ordering information identifies the following configuration codes:
| Code | Description |
|---|---|
| -S | Standard type |
| -H | With HART communication |
| 5 | Without explosion protection |
| E | With explosion protection |
| 0 | Basic type |
| 1 | With ISA Standard G3 option |
| /13S00 | Pressure Clamp Terminal Block for Isolated Analog, NFT13S-00 |
| /13S10 | Pressure Clamp Terminal Block for Isolated Analog with surge absorber, NFT13S-10 |
| /CCC01 | Connector Cover for MIL Cable, NFCCC01 |
The terminal block and connector cover are specified as separate option codes. Check the complete order code to identify the supplied connection hardware and communication configuration.
Frequently Asked Questions
Q: How many analog signals can the NFA1135-S00 receive?
A: The specified configuration provides eight isolated input channels. Each channel receives a 4-20 mA current signal.
Q: Does the NFA1135-S00 support HART communication?
A: HART communication is listed as an available configuration. The ordering information distinguishes the standard -S version from the -H version with HART communication. Confirm the complete model suffix before selecting the module.
Q: Which terminal block is specified for this module?
A: The ordering information lists NFT13S-00 as the pressure clamp terminal block for isolated analog signals. NFT13S-10 is another option and includes a surge absorber.
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