NFLR121-S00 Yokogawa CENTUM VP Series Datasheet & Technical Manual

Yokogawa NFLR121-S00 Serial Communication Module

The Yokogawa NFLR121-S00, also cataloged as the NFLR121 Serial Communication Module, operates as a dedicated hardware component for serial data transfer within CENTUM VP / CS 3000 networks.

Suffix Breakdown & Model Matrix

• Base Model: NFLR121 (Serial Communication Module, RS-422/RS-485 layout execution)
• Suffix Type (-S): Standard mechanical block configuration
• Functional Variant (00): Standard connector configuration without integrated surge absorber units

Hardware Specifications

4-20 mA HART Loop Protocol and Subsystem Connectivity

The NFLR121-S00 functions as a physical interface link layer, translating differential RS-422/RS-485 signal states into data frames for processing by the central system. The transceiver circuits isolate field inputs to maintain signal integrity alongside parallel 4-20 mA HART loop protocol instruments. This design utilizes channel-to-channel isolation principles to suppress common-mode electrical noise and prevent ground-loop cross-talk across external networks. Digital variable variables pass smoothly through the interface layer, and built-in cold junction compensation (CJC) offsets remain uncorrupted by any nearby electromagnetic induction.

Frequently Asked Questions

Q: What are the explicit electrical behaviors and risk constraints when running live hot-swap procedures with the NFLR121-S00 module?

A: The hardware supports active physical extraction and insertion while the node chassis is energized. However, executing a live hot-swap immediately breaks the differential serial communication loop across the associated ports, which drops active variables and generates immediate communication fault frames within the DCS controller registers.

Q: How does the lack of an integrated surge absorber in the -S00 configuration affect inductive field lines?

A: The -S00 designation indicates a standard termination layout without built-in surge clamping components. If the module interfaces with field setups susceptible to high-voltage induction or lightning transients, external surge barriers must be wired into the loop to protect the 1500 V AC dielectric isolation layer.

Field Installation Guidelines

• Module Seating and Mechanical Grounding: Guide the unit along the chassis card slot rails until the rear high-density multipin connector seats into the backplane matrix. Fasten the integrated faceplate retaining screws to verify low-impedance grounding with the cabinet framing.
• Shield Terminal and Earth Drainage: Connect the external serial cable's foil-and-braid shield directly to the low-impedance copper ground bar inside the marshalling cabinet. Do not configure multiple ground connections to prevent creating secondary ground loops.
• Cable Separation Distance Constraints: Route all low-voltage serial data lines inside independent wire ducts. Maintain a physical space of at least 300 mm from high-voltage AC mains, power distribution cables, or motor drive lines to eliminate induced transient noise.
• Thermal Environment Management: Keep vertical airflow channels around the card slot assembly free of obstructions to ensure passive air dissipation, keeping the surrounding temperature within the -20 to +70 deg C operating index.