Rockwell-automation T3468A ICS Regent DC Guarded Digital Output Module Manual de usuario descargar pdf (Pagina 3)

(T3461A, 62A, 68A) DC Guarded Digital Output Modules

6019

Mar

energized. This combination of series output switches and

independent drive signals produces fail

safe activation of the

load. Single failures can only affect one of the output drive

signals or switches. A single failure will result in either

continued correct control or a fail

safe output as shown in

Table

. Output States After Switch Failure.

Case

Commanded

Output St

ate

Switch

Failed

State

Actual

Output

to Load

Remarks

Continued correct control.

Automatic testing detects

stuck

on switch. If output is

subsequently commanded

off, output will turn off.

Off

Fail

safe output. Automatic

testing detects stuck

off

switch.

Off

Continued correct control.

Automatic testing detects

stuck

off switch. If output is

subsequently commanded

on, output will turn on.

Off

Fail

safe output. Automatic

testing detects stuck

off

switch. If ou

tput is subse

quently commanded on,

output will remain off.

To achieve fault tolerance, two Guarded output modules are

used with their outputs connected in parallel. This

configuration provides for continued correct control even

when one output switch fails off (cases two and four in Table

). The module failure is automatically detected and the

module can be removed and replaced without interrupting

output control.

Testing and Diagnostics

The voter and I/O bus interface logic o

f the Guarded output

modules is automatically tested by the processor modules.

Discrepant data are sent through one of three legs of the I/O

Safetybus to determine whether the module’s voters are able

to outvote the incorrect data. A failure to return the correct

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Rockwell-automation T3468A ICS Regent DC Guarded Digital Output Module Manual de usuario Pagina 3

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