HIMA F8650X Central Module CPU for PES H51q SIL 3

Overview

The HIMA F8650X central module is the CPU of the PES H51q-MS, H51q-HS and H51q-HRS safety controllers, order number 98 4865065. It executes the safety program with two clock-synchronized microprocessors and is approved for safety applications up to SIL 3 according to IEC 61508. This HIMA F8650X central module is offered as a genuine, tested unit for H51q-based installations.

In a HIMA H51q system every safety function – from emergency shutdown logic to burner management – runs on the central module. The HIMA F8650X central module provides the processing power, the safety-related watchdog output and the serial interfaces that connect the controller to the HIBUS and to engineering tools.

Engineering & Design

The HIMA F8650X central module carries two clock-synchronized Intel 386EX 32-bit microprocessors running at 25 MHz, each with 1 MB Flash-EPROM for the operating system, 1 MB Flash-EPROM for the user program and 1 MB SRAM for data. Two electrically isolated RS 485 serial interfaces connect the module to the system bus, and the station number and baud rate are set with switches S1 (1-31 serial / 1-99 Ethernet addressing; 9600 or 57600 bps).

Diagnostics are handled by a 4-digit matrix display, two CPU/IO LEDs, two toggle switches and an ACK button. The safety-related watchdog output is 24 V, loadable up to 500 mA and short-circuit proof, shutting down on fault. The module occupies 8 SU and draws 5 V / 2 A; a lithium CR 2477N battery buffers the real-time data and is replaced after at most 6 years.

Key Features

• HIMA F8650X central module (CPU), order no. 98 4865065, PES H51q-MS/-HS/-HRS
• Two clock-synchronized Intel 386EX microprocessors, 25 MHz
• Safety-related, applicable up to SIL 3 per IEC 61508
• 2 x electrically isolated RS 485 interfaces
• 4-digit matrix display, CPU/IO LEDs and ACK button
• 24 V watchdog output, loadable to 500 mA, short-circuit proof

Applications

• Emergency shutdown (ESD) and process shutdown logic on PES H51q
• Burner management and furnace protection systems
• Fire and gas logic in HIMA H51q based installations
• Upgrade path from F 8650 to F 8650X with fan concept change

Specifications

Compatibility

The HIMA F8650X central module is the CPU of the PES H51q-MS, -HS and -HRS controllers. It works with HIMA F 7xxx I/O modules, F 7553 coupling modules and F 8627X communication modules (ELOP II TCP, safeethernet, Modbus TCP). Upgrading from F 8650 to F 8650X requires a fan concept change per the HIMA data sheet.

Ordering Information

Order the HIMA F8650X by its original order number 98 4865065. Spare battery CR 2477N is HIMA part no. 44 0000018. Verify the firmware level against the rest of the H51q system before commissioning.

The F8650X is supplied with the original HIMA order number marked on the module, so stock control and certification records stay consistent. Firmware levels should be verified against the rest of the H51q system before commissioning, and the backup battery CR 2477N should be checked in line with the HIMA replacement interval.

Why Seven Star LLC

Seven Star LLC supplies genuine HIMA central modules to oil, gas and power plants across Oman and

Our engineers help you verify the exact model and revision before ordering, avoiding costly mismatches.

Matching the Spare to Your H51q System

Central modules must match both the hardware and the operating system requirements of the controller. Confirm the type designation and order number on the installed module, check the operating system version that the running application was built with, and review whether the system is a single, redundant or highly redundant configuration. It is good practice to discuss the version compatibility with your safety system engineer before installing any replacement CPU.

• Module designation and order number from the label.
• Operating system version shown during start-up or in the engineering tool.
• Controller variant: H51q-MS, H51q-HS or H51q-HRS.
• Switch S1 settings for station number and baud rate on the existing module.

Replacement and Commissioning

In redundant H51q systems a central module can often be exchanged while the second CPU keeps the process running, but the exchange must follow the HIMA procedure and the plant’s safety system change management rules. Set switch S1 to match the original module, insert the replacement, and confirm that it synchronises and that the application is loaded and running. Check the matrix display and LEDs for errors, verify communication on the RS 485 interfaces, and record the change in the safety system log.

Maintenance and Troubleshooting

Plan the replacement of the buffer battery within the interval stated by the manufacturer, and keep engineering backups of the application current. Error codes on the matrix display give the first indication of a fault; note the code before acknowledging it. Communication problems usually relate to cabling, termination or addressing on the serial bus. Holding a tested HIMA F8650X central module in site stores reduces the time a redundant system runs without its standby CPU.

Applications in Oman and the GCC

H51q controllers still protect emergency shutdown, fire and gas, and burner management functions at many oil and gas, gas processing and petrochemical plants in the region, often with many years of remaining service.

Sourcing from Seven Star LLC

Seven Star LLC supplies HIMA spare modules to operators in Oman and the GCC. Send the module designation, order number and quantity, and our team will confirm availability and condition.

Request a Quote for HIMA F8650X Central Module CPU for PES H51q SIL 3

For the HIMA F8650X central module or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your module, I/O and system configuration, and our specialists will respond with a detailed commercial proposal and the relevant HIMA documentation.

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