ICS Triplex T9481 Analoque output module

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.