HIMA F 8621(F8621 ) Left CPU Communication Module

MODULE OVERVIEW

The F 8621 (F8621) is a communication module within the HIMA HIMax safety controller system. In redundant CPU architectures, it is typically assigned as the Left CPU communication interface.

Its primary function is to establish a secure and deterministic communication path between safety processors and external systems such as Ethernet networks, Modbus TCP devices, and higher-level DCS or HMI platforms. The module is designed to meet up to SIL 3 safety integrity level requirements.

ARCHITECTURE AND CORE FUNCTIONS

The F 8621 integrates multiple safety-oriented communication and diagnostic mechanisms to ensure fault-tolerant operation in critical automation environments.

• Dual processing structure: Internal redundancy enables continuous self-monitoring of communication integrity to eliminate single-point failures.
• SafeEthernet support: Enables SIL 3 certified high-speed safety communication between HIMA controllers.
• Protocol compatibility: Supports Modbus TCP, TCP/IP, UDP, and 3964R for integration with third-party systems.
• Hot-swap capability: Allows module replacement during runtime without system shutdown.

TECHNICAL SPECIFICATIONS

ENGINEERING AND CONFIGURATION GUIDELINES

Slot assignment logic:
In SILworX configuration software, the physical placement of the module must strictly match the logical definition of “Left” or “Right” CPU slots to ensure system consistency.

Redundancy synchronization:
In redundant architectures, both CPU sides operate as a single logical system. Communication parameters must remain fully synchronized to avoid state mismatch.

Address configuration:

• 3964R protocol supports manual or automatic data block addressing.
• BUSCOM (Modbus TCP) typically operates within address ranges 0–2048 and 4096–8192.

Online modification rules:
Configuration changes are only permitted during runtime when reloadable code has been generated, allowing non-stop operation during updates.

COMMON TECHNICAL NOTES

Address conflict handling:
If BUSCOM and 3964R address ranges overlap, the system automatically shifts base addressing to resolve conflicts without manual intervention.

Fiber communication support:
The standard F 8621 uses RJ45 copper interfaces. Fiber connectivity requires external media converters or dedicated interface modules.