I/O Card Redundancy
Redundant I/O cards are available for critical applications.
The same card can be used in simplex or redundant
applications. When installed on a two-wide redundant terminal
block, the cards are recognized as a redundant pair by the
controller. The controller scans each card and determines which
card is acting as the active interface. When a fault is detected,
the system automatically switches to the standby I/O card.
DeltaV Control modules reference simplex and redundant
I/O channels identically and there is no special configuration
required to take advantage of redundancy.
Events that can cause a switchover include.
Hardware failure within the active card.
Communications failure between the active card and the controller.
Detection of a fault in the field wiring.
Switchover of a redundant I/O card is completed within
two scans of the I/O bus. Make-before-break contacts ensure
digital field instruments remain powered and the process
is undisturbed. Analog output signals are briefly driven by
both cards for < 5 ms during switchover of the card.
Hardware Alerts automatically report hardware integrity errors
for both the primary and secondary cards. Any event that
causes a switchover is also reported automatically through the
system hardware alerts and is logged in the Event Chronicle.
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