HIMA F8628X PROFIBUS DP Slave Communication Interface Module

The HIMA F8628X is a rack-mounted, galvanically isolated DC/DC safety power supply module designed for the central rack of HIMA H41q / H51q safety-related control systems (PES). It converts a 24 V DC primary supply into a tightly regulated 5 V DC system voltage that powers the central processing units, communication modules, and I/O logic circuits inside the safety instrumented system (SIS) rack.

🔷Key Specifications

Specification	Detail
Brand	HIMA
Model	F8628X
Module Type	Isolated DC/DC Safety Power Supply Module
Compatible System	HIMA PES H41q / H51q Safety Control Systems
Input Voltage	24 V DC (range –15 % to +20 %)
Output Voltage	5 V DC, stepless adjustable; factory preset 5.4 V DC ±0.025 V
Rated Output Current	10 A continuous
Current Limiting	Approx. 13 A
Overvoltage Protection	6.5 V DC ±0.5 V
Isolation	Galvanic isolation between 24 V input and 5 V output
Conversion Efficiency	≥ 77 %
Front Panel	Test socket + voltage trim potentiometer
Redundancy	Supports parallel redundant operation (voltage balance ≤ 0.025 V between modules)
Rack Width	8 TE (standard F-series plug-in format)
Operating Temp.	–20 °C to +60 °C
Storage Temp.	–40 °C to +85 °C
Humidity	5 %–95 % RH, non-condensing
Protection	Overvoltage, overcurrent, short-circuit proof
Safety Integrity	SIL 3 capable (IEC 61508 / IEC 61511 context)
EMC Compliance	VDE 0871 / 0877 Class B
Country of Origin	Germany

🔨Product Overview

The HIMA F8628X is the dedicated 24 VDC-to-5 VDC converter module for HIMA safety racks. Unlike a commercial off-the-shelf power supply, it is qualified for use in safety-related automation architectures where deterministic fault behavior, electrical isolation, and redundant availability are mandatory.

Installed in the central rack backplane, the F8628X:

Supplies regulated 5 V DC to H41q/H51q central modules and I/O carriers
Electrically isolates field-side 24 V DC from sensitive 5 V logic circuits
Detects overvoltage, overload, and short-circuit conditions
Supports load-sharing redundancy with other F8628X modules

Because the module is part of the safety power architecture, a single F8628X failure in a redundant setup does not disable the safety function. The remaining module continues to carry the 5 V backplane load while the fault is reported to the controller.