HORNER HE670RLY168C Safety-Reliable Relay Module

HORNER HE670RLY168C Safety-Reliable Relay Module for Critical Control Sites

The HORNER HE670RLY168C is a ruggedized relay output module engineered for demanding industrial environments where control continuity, signal integrity, and operational safety are non-negotiable. Designed as part of the HORNER HE670 OCS/XL controller platform, this relay module delivers dependable discrete output switching across a wide range of critical process control, safety interlock, and heavy-duty automation applications. Whether deployed in continuous production lines, high-EMI control cabinets, or hazardous-area field panels, the HE670RLY168C provides the switching reliability that safety-critical sites demand.

At NINERMAS, every HE670RLY168C unit is pre-shipment tested and backed by a 12-month warranty, ensuring that replacement and commissioning cycles remain predictable and low-risk for maintenance teams managing long-lifecycle control systems.

Safety Reliability Table

Control Cabinet Risk Reduction Strategy

In critical control cabinets serving petrochemical, power generation, and heavy manufacturing sites, a single relay output failure can cascade into unplanned shutdowns, process upsets, or safety system activations. The HORNER HE670RLY168C addresses this risk through robust contact isolation and high-cycle relay endurance, making it a dependable choice for both normal operational switching and emergency interlock duty.

For complete cabinet-level protection, the HE670RLY168C is commonly deployed alongside the HORNER HE670 CPU module as the primary controller, with HORNER HE670ADC analog input modules handling process variable acquisition and HORNER HE670DAC analog output modules driving final control elements such as control valves and variable-speed drives. On the discrete input side, HORNER HE670DC 24 VDC input modules capture field device status signals — limit switches, pressure switches, and safety door interlocks — feeding the logic engine that drives the HE670RLY168C outputs.

Power supply stability is equally critical. Pairing the HE670RLY168C with a HORNER HE500PS1 or equivalent regulated 24 VDC DIN-rail power supply ensures that relay coil voltage remains within tolerance even during mains fluctuations or surge events. For surge protection at the cabinet entry point, Phoenix Contact TRABTECH or DEHN surge protection devices are recommended to prevent transient overvoltage from reaching the relay module’s logic interface.

In communication-intensive architectures, the HE670RLY168C operates within systems that also include HORNER HE670ETN Ethernet communication modules for SCADA connectivity and HORNER HE670CAN CANopen network modules for distributed I/O expansion. Maintaining communication integrity across these modules is essential — any network anomaly that disrupts the controller’s output scan can result in relay state uncertainty, which is why redundant communication paths and watchdog-enabled output modules are standard practice in safety-rated installations.

For installations requiring documented safety performance, the HE670RLY168C is typically integrated with PILZ PNOZ safety relays or Schneider Electric Preventa XPS safety modules in the emergency stop and machine guard interlock circuits, ensuring that the relay output layer meets the functional safety requirements of the broader safety instrumented system (SIS).

Critical Industrial Safety Applications

Petrochemical & Refinery Plants: In continuous process environments, the HE670RLY168C controls motor starters, solenoid valves, and alarm annunciators within distributed control cabinets. Its high contact rating and optical isolation prevent ground loop interference from corrupting output states in areas with heavy cable runs and variable-frequency drive noise.

Power Generation & Substation Control: Relay output modules in power plant auxiliary control systems must withstand high electromagnetic fields from transformers and bus bars. The HE670RLY168C’s ruggedized construction and isolated relay contacts make it suitable for generator excitation control panels, switchgear auxiliary circuits, and protection relay test panels.

Mining & Mineral Processing: Underground and surface mining operations subject control equipment to vibration, dust ingress, and humidity extremes. Deployed in sealed enclosures, the HE670RLY168C reliably switches conveyor drive contactors, pump motor starters, and ventilation fan controls without contact degradation under these conditions.

Water & Wastewater Treatment: Municipal and industrial water treatment facilities rely on relay output modules to control submersible pump starters, chemical dosing pump contactors, and UV disinfection system enables. The HE670RLY168C’s 8 A contact rating accommodates the inrush currents typical of pump motor starting circuits.

Metallurgy & Steel Production: In electric arc furnace auxiliary control and rolling mill automation, relay modules must tolerate extreme thermal cycling and high-frequency electrical noise. The HE670RLY168C’s industrial-grade relay contacts and backplane isolation provide the switching endurance required for these high-cycle, high-temperature applications.

Port & Marine Automation: Ship-to-shore crane control systems and vessel engine room automation panels require relay output modules that perform reliably in salt-air, high-humidity environments. The HE670RLY168C, installed in IP-rated enclosures, provides the discrete output switching needed for hoist motor control, ballast pump management, and navigation light circuits.

Safety and Quality FAQ

Q1: Does the HE670RLY168C come with a warranty?
Yes. Every HORNER HE670RLY168C supplied by NINERMAS is covered by a 12-month warranty from the date of shipment. Units undergo pre-shipment functional testing to verify relay contact operation, output isolation integrity, and backplane communication before dispatch.

Q2: How is the HE670RLY168C tested before shipment?
Each unit is subjected to a pre-shipment inspection that includes relay coil energization testing across all 16 output channels, contact resistance measurement, and isolation voltage verification between the logic bus and relay contacts. This process ensures that field installation proceeds without latent defects.

Q3: Is the HE670RLY168C compatible with existing HORNER HE670 systems?
Yes. The HE670RLY168C is a direct plug-in replacement for relay output modules within the HORNER HE670 OCS/XL backplane architecture. No firmware changes or controller reconfiguration are required for like-for-like replacement, minimizing downtime during spare part changeover.

Q4: Can NINERMAS guarantee long-term supply for the HE670RLY168C?
NINERMAS maintains dedicated inventory of HORNER HE670 series modules, including the HE670RLY168C, to support long-lifecycle industrial installations. For sites requiring guaranteed availability under maintenance contracts or planned shutdown schedules, consult our team at sale@ninermas.com to discuss stock reservation and lead time commitments.