System Configuration Overview - Honeywell FSC-SM Installation Manual

3.2

System Configuration Overview

Introduction
Redundant FSC-SMM
modules
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The FSC Safety Manager (FSC-SM) system consists of a redundant Fail
Safe Control (FSC) system fitted with a redundant pair of FSC Safety
Manager Modules (FSC-SMMs).
Each FSC Central Part contains a central processor unit (CPU), a
watchdog (WD) and communication modules (COM). Each Central Part
has its own dedicated I/O modules and/or shared I/O modules.
The FSC-SM is configured for redundant operation. There can only be one
FSC-SMM in each Central Part.
In this configuration, each FSC-SMM is independently connected to the
UCN. One of the two will function as the primary, carrying out all UCN to
FSC-SM communication and data transfer operations. The other
FSC-SMM functions as the secondary or backup link between the UCN
and FSC. Database synchronization and status and control transfers
between the Primary and Secondary take place over the UCN.
FSC Safety Manager Installation Guide 10/01