The Trusted® Communications Interface (CI) is an intelligent module that provides a range of
communication services for the Trusted Controller, minimising communication loading of the Triple
Modular Redundant (TMR) Processor.
A user-configurable module, the CI can support multiple communication media.
Up to four Communications Interfaces (CIs) can be supported by a Trusted System.

Features:
• Trusted Operating System.
• Dual Ethernet and four serial ports.
• Support for a wide range of communication protocols.
• Secure, dependable communications via high performance communications links.
• Modbus Slave.
• Optional Modbus Master (with T812X Trusted Processor Interface Adapter).
• Optional Sequence Of Events (SOE) Over Modbus.
• Front Panel serial diagnostic port, fault and status indicators.
PREFACE
In no event will Rockwell Automation be responsible or liable for indirect or consequential
damages resulting from the use or application of this equipment. The examples given in this
manual are included solely for illustrative purposes. Because of the many variables and
requirements related to any particular installation, Rockwell Automation does not assume
responsibility or reliability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, with respect to use of information,
circuits, equipment, or software described in this manual.
All trademarks are acknowledged.
DISCLAIMER
It is not intended that the information in this publication covers every possible detail about
the construction, operation, or maintenance of a control system installation. You should also
refer to your own local (or supplied) system safety manual, installation and
operator/maintenance manuals.
REVISION AND UPDATING POLICY
This document is based on information available at the time of its publication. The
document contents are subject to change from time to time. The latest versions of the
manuals are available at the Rockwell Automation Literature Library under "Product
Information" information "Critical Process Control & Safety Systems".
Data writes are more complicated. If a data write simply updated the local copy and was
then relayed to the processor, the other Communications Interfaces in the system would
carry different data. This may cause problems for redundant links.
To overcome this problem, when data is written to a Communications Interface, it is first
passed to the TMR Processor and the write is acknowledged immediately by the
Communications Interface (to avoid communications delays). The processor updates its own
database and then sends the data back to all Communications Interfaces so that they all
have the same data. This can take one or two application scans. This means that subsequent
reads will receive the old data immediately after the write, until the new data has been
distributed.
All changes to CI parameters (.ini changes) loaded online do not require a power cycle, and
will take effect immediately. The Communications Interface disconnects all communications
and restarts. Communications is also restarted on an application online update and is shut
down when the application is stopped.
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