RIO Remote I/O System User Guide
Installing a fault tolerant link
Page 189
Chapter 2 Installing hardware and software
Installing a fault tolerant link
In a typical non fault tolerant RIO system, a host card is co nnected to a peripheral (for
example, printer) via a single link and RTA. In order to make the s ystem fault tolerant, that is
to protect against RTA or link failure, multiple RTAs and links are added.
The next picture shows a typical system which features t wo backup RTAs and a backup link
to the host. If one RTA or link cable is damaged there is still a path from the host and system
operation is not disrupted.
To install a fault tolerant system proceed as follows;
1. Install the system components as normal using procedures described earlier in this
chapter up to the point at which you add the links to the system.
2. When you install th e links in your system, install extra links for a given device (for
example, an RTA8) such that there is at least two routes to each device.
3. Continue with the installation procedure as normal through to completion.
Note
Please refer to Before you starton page 33 to select the correct
installation procedure for your operating system.
Note
No extra configuration is required by the user for a fault tolerant
system.
RIO Host card
Backup link to host
Multiple RTAs to
maintain operation
in event of RTA
failure
Peripheral
For example,
printer