Yokogawa NFLR121-S00 CENTUM VP/CS 3000 FIO Subsystem

The Yokogawa NFLR121-S00, also cataloged as the Yokogawa NFLR121 Relay Output Terminal Block Unit, operates as a dedicated hardware component for relay-isolated output interface execution within CENTUM VP / CS 3000 FIO platforms. Configured for high-density physical signal switching, the device isolates digital logic control circuits from external physical field loads via electro-mechanical contacts.

Suffix Breakdown & Model Matrix

Hardware Specifications

4-20 mA HART Loop Protocol & Channel Isolation

While handling digital command verification, this instrumentation architecture integrates with platforms processing adjacent 4-20 mA HART loop protocol signals. The unit relies on galvanic physical separation to prevent loop noise migration across the terminal plane. Internal layout properties deliver high channel-to-channel isolation parameters, checking crosstalk issues and ensuring that high-voltage inductive switching transients do not disrupt analog data integrity or sensor feedback loops sharing the local control enclosure.

Frequently Asked Questions

Q: Does the -S00 suffix version provide protection against inductive field spikes?

A: No. The -S00 suffix designates a standard layout configuration lacking built-in surge absorbers. Inductive external loads such as large solenoids or motor starters require localized diode snubber circuits or external RC networks across the field wiring terminals to safeguard the internal electromechanical relay contacts.

Q: Can the pressure-clamp terminals accept direct stranded wiring layouts without ferrules?

A: Yes. The pressure-clamp structure supports round crimp terminals with M4 screws, accepting wire dimensions from 0.5 to 2.5 mm2 (AWG 20 to 14). However, using crimped ferrules prevents strand separation and preserves electrical connection reliability under low-frequency industrial vibration conditions.

Field Installation Guidelines

• Secure the physical chassis directly onto the FIO baseplate using the manufacturer-specified terminal mounting tracks to ensure correct bus alignment.
• Maintain strict structural separation between external high-voltage AC load lines and low-voltage DC communication or I/O module wires inside the cable duct system.
• Ensure all terminal screws match the specific torque limits for AWG 20-14 wiring interfaces to stop localized overheating or physical terminal fracturing.
• Connect the dedicated shield/earth terminal terminal explicitly to the local technical plant ground bus to stabilize baseline reference potentials.