HIMA F8652E

Description

Introduction and Product Overview

The HIMA F8652E is a Digital Input (DI) Module for the HIMA F86 safety system platform, specifically within the F8650x series family. This module is a certified safety component, not a standard PLC I/O card, designed to read the status of field devices within a Safety Instrumented System (SIS). Its primary function is to interface with safety-critical dry contacts or Namur sensors—such as those from emergency stop buttons, pressure switches, or flame detectors—and convert these physical on/off states into a reliable, diagnosed digital signal for the HIMA safety controller (e.g., an F8650x CPU). It is engineered to meet the rigorous diagnostic and reliability requirements of functional safety standards like IEC 61508. For wiring and safety specifications, the official HIMA F86 Hardware Manual for the F8652E is essential.

Technical Parameters and Characteristics

The F8652E digital input module is defined by its safety-focused design and diagnostic capabilities:

• Function: 8-Channel Digital Input Module for Safety Systems.

• Input Type: Designed for dry contacts (volt-free contacts) or NAMUR sensors (IEC 60947-5-6). It provides the sensing current for the field device.

• Number of Channels: 8 electrically isolated input channels.

• Diagnostics (Key Feature): Incorporates advanced Hardware Diagnostics (HWD). Each channel is continuously monitored for critical faults such as:

  • Cross-circuit detection: Identifying short circuits between channels or to power.

  • Wire-break and short-circuit detection for connected NAMUR sensors.

  • Loss of sensor power supply.

• Safety Classification: The diagnostics are so comprehensive that each single channel can be used in SIL 3 safety loops according to IEC 61508, due to its very high Safe Failure Fraction (SFF) and diagnostic coverage.

• Response Time: Configured, safety-certified response time suitable for high-integrity safety functions.

• Connection: Uses a removable front connector (typically a screw terminal block) for field wiring.

• Integration: Plugs into the HIMA F86 baseplate and communicates with the central safety controller via the internal safety bus.

Key Advantages and Features

The design of the HIMA F8652E provides critical advantages for implementing reliable safety functions:

1. SIL 3 Capability per Single Channel: This is its most significant feature. The extensive built-in diagnostics allow a single channel of the F8652E to be used in a 1oo1 (one-out-of-one) architecture for SIL 3 applications, reducing hardware complexity and cost compared to systems requiring hardware redundancy (like 1oo2) at the sensor level.

2. Comprehensive and Proven Diagnostics: The HWD technology actively detects dangerous hidden failures in the input circuit itself, ensuring the safety system is aware of its own health and can take appropriate action (e.g., initiate a safe shutdown) if a fault is detected.

3. Flexibility for Sensor Types: Support for both dry contacts and NAMUR sensors makes the F8652E versatile for connecting a wide range of safety field devices without requiring additional signal conditioning modules.

4. Clear Status Indication: Features per-channel LED indicators for signal state and fault conditions, providing immediate visual diagnostics at the module for troubleshooting.

Application Cases in Various Fields

This module is used to read critical status signals in the most demanding safety applications:

• Oil & Gas (ESD/F&G Systems): Connecting emergency stop buttons, gas detector fault contacts, and pressure safety switch contacts.

• Chemical Plants: Monitoring contacts from rupture disc sensors, high-level switches in reactors, and manual trip stations.

• Power Generation: Reading boiler flame detector status and turbine overspeed switch contacts.

• Machine Safety (Presses, Robots): Interfacing with safety gate switches and two-hand control units.

Comparison with Competing Products

The HIMA F8652E competes with high-integrity digital input modules from other safety system vendors:

• Siemens ET 200SP F-DI (Fail-Safe Digital Input) modules.

• Rockwell/Allen-Bradley Guard I/O digital input modules.

• ABB Safe I/O for System 800xA.
  HIMA’s key differentiator with the F8652E is its ability to claim SIL 3 on a single channel due to its certified diagnostic coverage. Many competitors achieve high SIL levels through redundant channel architectures (e.g., 1oo2), which can require more wiring and hardware. The F8652E offers a simplified yet highly reliable architecture for appropriate applications.

Selection Suggestions and Precautions

Implementing this safety I/O module requires a rigorous safety engineering approach:

1. Safety Loop Design: The use of a F8652E module, especially in a 1oo1 architecture for SIL 3, must be justified within the Safety Requirements Specification (SRS) and validated by the appropriate safety calculations (PFDavg verification).

2. Correct Sensor Selection: When using NAMUR sensors, they must be compatible and certified for use in safety loops. The F8652E provides the intrinsic safety energy limitation for NAMUR sensors.

3. Wiring and Separation: Safety signal wiring must be physically separated from standard control wiring to prevent interference and maintain integrity. Follow HIMA’s installation guidelines precisely.

4. Configuration and Testing: The module must be correctly configured in the HIMA Safety Engineering Tool. After installation, the entire safety loop, including the field device and the F8652E input, must be functionally tested to verify proper operation and diagnostic response.

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