The Yokogawa NFLR121-S00, also cataloged as the NFLR121 Serial Communication Module, operates as a dedicated hardware component for serial data exchange within FCN autonomous controller networks.
Suffix Breakdown & Model Matrix
Parameter / Suffix Code
Specification Breakdown
Base Model (NFLR121)
Serial Communication Module for FCN autonomous controllers
Functional / Rev Code (-S00)
Standard single-channel RS-422/RS-485 configuration
Hardware Specifications
Parameter
Specification
Model
NFLR121-S00
Brand
Yokogawa
Origin
Japan
Weight
0.3 kg
Dimensions
Standard STARDOM / FCN module form factor
Operating Temp
0 to 55 deg C
Power Consumption
5 VDC system backplane draw, 500 mA current consumption
The module incorporates transformer isolation to decouple the internal bus processing logic from external serial transmission lines, preventing transient noise propagation across long cable runs up to 1200 m. Dedicated signal conditioning circuits suppress common-mode electrical interference, maintaining transmission accuracy for ASCII and binary data protocols operating at speeds up to 1.85 Mbps. This isolation architecture ensures reliable data exchange alongside analog input loops, such as 4-20 mA HART loop protocol gateways, without introducing measurement offset or cross-talk.
Frequently Asked Questions
Q: Does the NFLR121-S00 module support both two-wire and four-wire serial bus configurations?
A: Yes, the channel can be configured for half-duplex operation in two-wire setups or full-duplex operation in four-wire RS-422/RS-485 networks using start-stop synchronization.
Q: What termination precautions must be taken when wiring the module for RS-485 multipoint connections?
A: A 120 ohm line termination resistor must be connected across the differential line terminals at both extreme ends of the RS-485 network to suppress signal reflections at high data transfer rates.
Field Installation Guidelines
Mount the NFLR121-S00 module into the designated base rack slot of the FCN controller, ensuring the rear backplane connectors engage fully before securing the module retention latch. When using the terminal block connection option, tighten the M4 screw clamps to a torque of 1.2 Nm. Route all RS-422/RS-485 shielded twisted-pair cables separately from high-voltage AC power wiring, maintaining a minimum physical separation of 150 mm. Connect outer cable shields directly to the cabinet protective earth (PE) bus bar with low-impedance copper grounding leads.
