Emerson SE4002S1T2B5 Discrete Output Card

Reduced installation time and expense: The DeltaV system’s

S-series I/O interfaces are designed for quick assembly and

error proof maintenance. All carriers snap onto T-DIN rails and

interfaces snap into the I/O slots without the use of any tools.

Each I/O interface has a separate wiring terminal block,

which connects field wiring to the interface. The I/O card can

easily be removed without touching the I/O wiring on the

terminal block. Some I/O cards can also use the fused terminal

block, which is equipped with in-line fuses that can be pulled

to isolate power to the field circuit.

Traditional I/O interfaces have I/O function keys that allow

the terminal block to be set to receive a specific I/O card.

These keys ensure that the correct I/O card is always plugged

into the corresponding terminal block. The keys provide a

safety measure by preventing the wrong I/O card being

installed. It’s incredibly easy to use and gives you time to do more.

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.

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.

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