NFAI135-S50/CCC01

The Yokogawa NFAI135-S50/CCC01 is an 8-channel isolated analog input module designed to receive 4-20 mA signals from field transmitters. It converts individual process current signals into input data for the STARDOM FCN autonomous controller. Each channel is isolated from the system and other channels. This ordering configuration includes a connector cover for the MIL cable connection.

Technical Specifications

Parameter	Specification
Model	NFAI135-S50/CCC01
Brand	Yokogawa
Product Type	Isolated Analog Input Module
Number of Channels	8
Input Signal	4-20 mA
Channel Isolation	Isolated between channels and system
Allowable Input Current	25 mA
Input Resistance (Power ON)	250 Ohm
Input Resistance (Power OFF)	500 kOhm or more
Accuracy	+/-0.1% of full scale
Data Refresh Cycle	10 ms
Input Step Response Time	100 ms
Transmitter Power Supply	20.2 to 29.3 V
Overcurrent Protection	Provided
Maximum Current Consumption	360 mA (5 V DC), 450 mA (24 V DC)
External Connection	MIL connector cable
Withstanding Voltage	500 V AC for 1 minute
Weight	0.3 kg
Dimensions	32.8 x 107.5 x 130 mm

Analog Input Processing and Channel Isolation

The NFAI135 receives standard 4-20 mA current signals from field transmitters and converts them into digital measurement values for controller processing. Its eight input channels allow multiple process variables to be monitored through one module.

Individual channel isolation separates field input circuits from one another and from the system side. The specified withstand voltage is 500 V AC for one minute, both between input and system and between channels. This isolation arrangement is relevant when field devices have different electrical reference potentials.

Input Accuracy and Response Characteristics

The module has a specified input accuracy of +/-0.1% of full scale, with a 10 ms data refresh cycle and a 100 ms input step response time. These parameters describe different aspects of signal acquisition: the accuracy indicates measurement deviation relative to the configured full-scale range, while the refresh cycle determines how frequently updated input data is made available.

The input circuit includes overcurrent protection and has a nominal input resistance of 250 Ohm when powered. The maximum allowable input current is 25 mA, which should be considered when checking transmitter output conditions and loop wiring.

Ordering Code and Connector Configuration

The complete ordering number identifies the module configuration and its connection accessory.

Code	Description
NFAI135	8-channel isolated 4-20 mA analog input module
-S	Standard type
5	Without explosion protection
0	Basic type
/CCC01	Connector cover for MIL cable, model NFCCC01

The /CCC01 option specifies a connector cover rather than an additional signal-processing function. It should be considered when checking the physical connection arrangement and replacement requirements.

Frequently Asked Questions

Q: How many analog input signals can the NFAI135-S50/CCC01 handle?

A: It supports eight independent 4-20 mA input channels. Each channel has individual isolation from the other channels and the system.

Q: Does the NFAI135-S50/CCC01 support HART communication?

A: The specified -S suffix identifies the standard type. Yokogawa identifies the -H suffix as the HART communication version. Therefore, this -S50 configuration should not be identified as a HART version.

Q: What is the function of the /CCC01 option?

A: /CCC01 specifies a connector cover for the MIL cable connection, identified by Yokogawa as accessory model NFCCC01. It does not change the module's eight-channel analog input function.

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