HIMA F8628X

Description

Product Description
The HIMA F8628X is a highly specialized and safety-critical Digital Input Module from HIMA’s flagship HIMatrix Safety PLC system. Designed exclusively for implementing Safety Instrumented Systems (SIS) up to the highest Safety Integrity Levels (SIL 3 according to IEC 61508 and IEC 61511), this module is a fundamental component for reading signals from field devices in safety loops. The primary function of the HIMA F8628X is to interface with dry contact or active digital field devices—such as emergency stop buttons, pressure switches, level switches, and safety gate monitors—and convert these signals into a safe, validated digital format for the HIMatrix safety controller’s logic solver. Its design incorporates redundant circuits and comprehensive diagnostics to detect internal faults and field wiring problems, ensuring a safe and predictable response. For safety engineers in process industries like oil & gas and chemicals, selecting certified I/O modules like the F8628X is a non-negotiable requirement for building compliant and reliable safety systems. The module’s architecture is central to achieving the high diagnostic coverage required for SIL 3 applications.

Product Parameters

• Module Type: Digital Input (DI) Module for Safety Systems.
• Product Family: HIMA HIMatrix.
• Safety Certification: Certified for use in safety functions up to SIL 3.
• Number of Channels: Typically 8 or 16 channels (the “X” may denote a variant; exact count from datasheet).
• Input Type: Designed for dry contact (floating) inputs or active semiconductor inputs (NAMUR). Each channel is electrically isolated.
• Diagnostic Features: Includes advanced diagnostics such as cross-circuit detection, short-circuit detection to supply voltage, wire-break monitoring, and on-chip monitoring of the internal ASIC (Application-Specific Integrated Circuit).
• Response Time: Very fast, deterministic response time, typically in the millisecond range.
• Connection: Front connector type (e.g., screw terminal or spring-cage) for secure field wiring.
• Hot Swappable: Designed to be inserted and removed from the HIMatrix rack without powering down the system, supporting high availability.
• Configuration: Configured using HIMA’s dedicated safety engineering tool, Safety Designer.

Advantages and Features

• High Safety Integrity: The HIMA F8628X is not a standard PLC input; it is engineered with redundant internal signal paths and voting logic to safely manage faults, providing a high Safe Failure Fraction (SFF).
• Comprehensive Diagnostics: Its extensive diagnostic capabilities allow for the detection of over 90% of dangerous failures, which is crucial for calculating a low Probability of Failure on Demand (PFD) and meeting SIL 3 requirements.
• Flexible and Safe Input Types: Supports both dry contacts and NAMUR sensors (for hazardous areas), making it versatile for different field device technologies without external interfacing modules.
• Seamless Integration: Fully integrated into the HIMatrix’s TÜV-certified hardware and software toolchain, ensuring that the entire safety loop—from sensor via F8628X to logic solver to final element—is designed, validated, and documented as a cohesive system.
• Global Certifications: Carries major international certifications (e.g., TÜV, ATEX, IECEx) for use in safety-critical and hazardous area applications.

Application Cases in Application Fields

• Oil & Gas (Emergency Shutdown – ESD): Reading the status of emergency push-buttons, fire & gas detection system triggers, and critical pressure safety high (PSH) switches on a gas compressor platform.
• Chemical Processing (Burner Management – BMS): Monitoring flame detectors, proof of closure switches on fuel valves, and purge airflow switches in a fired heater safety system.
• Pharmaceutical (Reactor Safety): Interfacing with high-integrity level switches and pressure switches on a batch reactor to initiate a safe shutdown in case of overfill or overpressure.
• Power Generation (Turbine Overspeed Protection): Reading signals from redundant magnetic pickups measuring turbine shaft speed as part of a hardwired overspeed protection chain.

Comparisons with Competing Products
The HIMA F8628X competes with safety-rated digital input modules from other dedicated safety system vendors, primarily:

• Siemens SIMATIC ET 200SP F-DI: For use with S7-1500F/TF systems. The F8628X is part of a dedicated, TÜV-certified safety family (HIMatrix) rather than a safety option within a standard automation platform.
• Rockwell Automation GuardLogix with PointGuard I/O: The HIMA system, including the F8628X, is often perceived as a more specialized, “pure-play” safety solution with a longer heritage in high-end process safety.
• Emerson DeltaV SIS CHARMs: The F8628X is part of a standalone safety controller system, whereas Emerson’s CHARMs integrate SIS I/O directly into the process DCS architecture.

The HIMA F8628X‘s key advantage is its proven deployment in the most demanding SIL 3 applications and its reputation for extreme reliability and diagnostic depth within the safety engineering community.

Selection Suggestions and Precautions

1. Safety Lifecycle Compliance: This module must be used within a formally designed Safety Instrumented Function (SIF) as part of a full safety lifecycle per IEC 61511. A risk assessment and SIF specification are prerequisites.
2. Correct Module Variant: Ensure the exact variant (F8628X) matches the required channel count and input type (dry contact vs. NAMUR) for your application. Using the wrong type can compromise safety.
3. Wiring According to Manual: Safety system wiring is critical. Follow HIMA’s installation manual precisely for cable types, shielding, and grounding to maintain the module’s diagnostic capabilities and noise immunity.
4. Configuration and Validation: Every channel must be correctly configured in the Safety Designer software (e.g., assigned to a specific safety function, with appropriate diagnostics enabled). The complete SIF must be validated through testing.
5. Use of Certified Components: Never substitute with non-HIMA or uncertified components. The safety certification of the entire HIMatrix system depends on the use of approved modules like the F8628X.

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