NFLR121-S50 Yokogawa FCN Series Datasheet & Technical Manual

Communication Module RS-485 FCN Controller Yokogawa NFLR121-S50

Communication Module RS-485 FCN Controller Yokogawa NFLR121-S50

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Yokogawa NFLR121-S50 Serial Communication Module The Yokogawa NFLR121-S50, also cataloged as the NFLR121-S50 Serial Communication Module, operates as a dedicated...

رمز المنتج: NFLR121-S50

Manufacturer: Yokogawa
Product No.: NFLR121-S50
Product Type: Serial Communication Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 300g
Shipping port: Xiamen
Warranty: 12 months

وصف التقييمات

Yokogawa NFLR121-S50 Serial Communication Module

The Yokogawa NFLR121-S50, also cataloged as the NFLR121-S50 Serial Communication Module, operates as a dedicated hardware component for multipoint data exchange within STARDOM FCN and CENTUM VP platforms.

Hardware Specifications

Parameter	Specification
Model	NFLR121-S50
Brand	Yokogawa
Origin	Japan
Weight	0.3 kg
Dimensions	130 mm x 142.9 mm x 32.8 mm
Operating Temp	0 deg C to 55 deg C
Power Consumption	~4.5 W (24 V DC)
Ports	2 x RS-422/RS-485 (Isolated)
Baud Rate	0.3 kbps to 115.2 kbps

Serial Communication and Network Integrity

The NFLR121-S50 provides deterministic data exchange by utilizing fully isolated RS-422/RS-485 interfaces. This architecture suppresses common-mode noise and ground loop potentials often encountered when interconnecting disparate field devices or legacy PLCs over extended cable runs. The module supports both half-duplex and full-duplex transmission modes, allowing for flexible configuration based on the specific requirements of the connected serial instrumentation. Data integrity is managed through hardware-level parity and cyclic redundancy check (CRC) algorithms, which monitor incoming frames for bit errors or synchronization failures before passing the payload to the FCN autonomous controller backplane.

Frequently Asked Questions

Q: Does the module support hot-swapping during active system operation?

A: The hardware is designed for insertion into the FCN backplane; however, refer to the specific STARDOM system documentation regarding I/O module hot-swap protocols and firmware compatibility before performing maintenance.

Q: Can both RS-422/RS-485 ports operate at different baud rates simultaneously?

A: Yes, each of the two ports is independently configurable. Users may assign distinct baud rates, parity, and stop-bit parameters to each port via the system engineering software.

Q: How should the termination resistance be handled for long-distance RS-485 cabling?

A: For cable lengths approaching the 1200 m limit, ensure that 120-ohm termination resistors are installed at both ends of the physical segment to prevent signal reflections and data corruption.

Field Installation Guidelines

Mounting and Bonding: Secure the module to the DIN rail or chassis. Ensure the module chassis ground point is bonded to the cabinet earthing system to maintain effective isolation between the isolated communication ports and the system backplane.
Cabling Constraints: Use shielded, twisted-pair cabling for all serial connections. Route communication cables through separate conduits or trays dedicated to data signals to mitigate electromagnetic interference from high-voltage AC lines.
Termination Procedures: When configuring multi-drop networks, maintain polarity consistency (A to A, B to B). Terminate unused wires within the shielded cable to a single common reference point at the controller end to prevent capacitive coupling.
Environmental Monitoring: The module dissipates approximately 4.5 W of heat. Maintain standard clearance requirements around the FCN chassis to ensure airflow is not restricted, especially in cabinets nearing the 55 deg C operating limit.

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