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NFLR121-S50 Yokogawa Serial Communication Module | New & Original Stock

NFLR121-S50 Yokogawa Serial Communication Module | New & Original Stock

Configured for serial data exchange in STARDOM controller platforms, the Yokogawa NFLR121-S50 (NFLR121-S50 Serial Communication Module) provides direct physical/electrical execution of RS-422 and RS-485 communication protocols.

Hardware Specifications

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SKU: NFLR121-S50
Vendor: Yokogawa
Category: Serial Communication Module
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Configured for serial data exchange in STARDOM controller platforms, the Yokogawa NFLR121-S50 (NFLR121-S50 Serial Communication Module) provides direct physical/electrical execution of RS-422 and RS-485 communication protocols.

Hardware Specifications

Parameter Specification
Model NFLR121-S50
Brand Yokogawa
Origin Japan
Weight 1.0 kg
Dimensions 130 mm x 50 mm x 30 mm
Operating Temp Consult controller environment manual
Power Consumption Refer to STARDOM backplane power budget
Interface Type RS-422 / RS-485
Protocol Support Modbus and subsystem integration

Process Control and Channel Isolation

The module facilitates data transmission between the STARDOM controller and external field devices, maintaining strictly defined protocol timings for RS-422/RS-485 interfaces. To ensure signal integrity across long-distance serial links, the design incorporates channel-to-channel isolation that prevents ground loops and cross-talk during asynchronous communication. This hardware configuration is calibrated to handle the electrical requirements of Modbus subsystem integration, ensuring consistent frame delivery within the controller network architecture.

Frequently Asked Questions

Q: Does this module support hot-swapping while the STARDOM controller is active?

A: Online insertion and removal (hot-swapping) capabilities are subject to the specific STARDOM rack and firmware revision. Refer to the controller system documentation to verify if the backplane power management allows for live module exchange.

Q: Is external termination required for the RS-485 interface?

A: Yes, standard industrial practice for RS-485 communication requires 120 Ohm termination resistors at both ends of the physical transmission line to minimize signal reflections.

Field Installation Guidelines

  1. Ensure the controller rack is de-energized or the slot is designated for maintenance before seating the module to prevent electrical faults on the backplane bus.
  2. Utilize twisted-pair shielded cabling for RS-422/RS-485 connections to reduce electromagnetic interference (EMI).
  3. Connect the cable shield to the system signal ground at a single point to prevent circulating currents.
  4. Verify correct wiring polarity (Tx+/Tx-, Rx+/Rx-) based on the pinout defined in the hardware installation manual.
  5. Confirm that the software configuration within the STARDOM controller matches the physical baud rate, parity, and stop-bit settings of the connected field devices.