Emerson SE4002S1T2B3 Discrete Output Card

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.

I/O Cards

A variety of analog and discrete I/O cards are available to meet

your specific requirements. The following cards support simplex or redundant installation:

„ AI 4-20 mA HART 8 channels

„ AO-4-20 mA HART 8 channels

„ DI, 24V DC Dry Contact, 8 channels

„ DO 24V DC High-Side, 8 channels

A switchover may also be initiated from the diagnostics

explorer, and the health and status of both cards and

their channels are available in the diagnostics explorer.

The system automatically commissions a new standby card.

In safe areas, failed cards can be replaced under power.

In hazardous areas, appropriate installation procedures

must be followed.

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.

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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