Product Overview

The HIMA F8652X is a high-performance safety-related CPU for critical control systems. This module uses two Intel 386EX 32-bit microprocessors running at 25 MHz each. It provides fail-safe operation for SIL 3 rated safety applications. The F8652X includes a diagnostic display and dual RS485 interfaces. You get reliable performance for emergency shutdown, burner management, and turbo-machinery control.

Technical Specifications

Processor and Memory

• Microprocessor Type: Dual Intel 386EX, 32-bit architecture.

• Clock Frequency: 25 MHz per microprocessor.

• Operating System Memory: Flash-EPROM of 1 MByte per microprocessor.

• User Program Memory: Flash-EPROM of 512 kByte per microprocessor.

• Data Storage Memory: sRAM of 256 kByte per microprocessor.

• Total Memory ICs: 5 integrated circuits per microprocessor.

Interfaces and Communication

• Serial Interfaces: 2 RS485 ports for communication.

• Diagnostic Display: 4 digit matrix display with requestable information.

• Error Switch-off: Fail-safe watchdog with 24 V DC output.

• Watchdog Load Rating: Up to 500 mA, short circuit proof.

• Bus Station Settings: Adjustable via switch S1 for station number and transmission rate.

Construction and Power

• Construction: 2 PCBs in European standard format.

• Display PCB: 1 dedicated PCB for diagnostic display circuits.

• Space Requirements: 8 TE (Telephone unit width).

• Operating Voltage: 5 V DC at 2000 mA current draw.

Diagnostic Display Features

• Display Type: 4 digit alphanumerical matrix display.

• Error LEDs: 2 LEDs for common error display (CPU for central modules, IO for testable I/O modules).

• Navigation Buttons: 2 switch-over pushbuttons marked <> for detailed information request.

• Acknowledge Button: ACK pushbutton resets the error indication.

• Failure Stop Behavior: ACK acts like system switch-on during failure stop.

Installation Guide

Follow these steps to install the HIMA F8652X correctly. First, set the bus station number and transmission rate on switch S1 before insertion. Second, insert the module into an 8 TE wide slot in your HIMax rack. Third, connect your RS485 communication lines to the two serial interfaces. Fourth, verify the 5 V DC power supply provides at least 2000 mA. Fifth, check the diagnostic display after power-up for any error codes. Sixth, press the ACK button to clear any startup error indications. Finally, test the fail-safe watchdog output by simulating a fault condition.

Package Contents

• 1 x HIMA F8652X safety-related CPU module.

• 1 x Pre-installed lithium buffer battery (CR 2477N type).

• 2 x RS485 communication connectors.

• 1 x Diagnostic display PCB assembly.

• 1 x Quick start reference card.

• Note: No additional cables or mounting hardware included.

Frequently Asked Questions (FAQ)

Q1: What safety level does the HIMA F8652X support?
A: This F8652X module is designed for SIL 3 safety applications according to IEC 61508. The dual 32-bit processors run in lockstep comparison for fail-safe operation. You can use it in emergency shutdown and fire protection systems.

Q2: How do I change the buffer battery on this CPU?
A: The lithium battery type is CR 2477N (HIMA part number 44 0000018). HIMA recommends changing the battery every 4 years for reliable data retention. At 25 °C, the battery life reaches 2500 days without voltage feeding.

Q3: What happens when the fail-safe watchdog triggers on the HIMA F8652X?
A: The watchdog output switches to a safe 24 V DC state at up to 500 mA. This output is short circuit proof for robust field wiring. You can connect it directly to a safety relay or emergency stop circuit.

Q4: How do I request detailed information on the diagnostic display?
A: Use the two push buttons marked <> to navigate through the display menu. The 4 digit alphanumeric matrix shows error codes and system status. Press ACK to reset the error indication after you resolve the issue.

Q5: Can I use the HIMA F8652X with non-HIMA I/O modules?
A: No, this safety CPU works only with HIMA testable I/O modules. The IO LED on the display specifically monitors HIMA’s testable IO-modules. Always use approved HIMA components for SIL rated systems.