Rockwell-automation T7485 ICS Regent+Plus Isolated Guarded Output Modu Manual de usuario descargar pdf (Pagina 3)

Isolated Guarded Digital Output Module

(T7485)

7034

Mar

field programmable gate arrays (FPGA). Each FPGA

independently operates one of the two output control switches.

The two output switches are connect

ed in series with the load.

When both output switches are on, current will flow through

the output and energize a field load. If either switch is off,

current will not flow through the output and the load will be

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 a

s shown in

Table

. Output States After Switch Failure.

Case

Commanded

Output State

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

on switch. If output is

bsequently commanded

on, output will turn on.

Off

Fail

safe output. Automatic

testing detects stuck

off

switch. If output is subse

quently commanded on,

output will remain off.

To achieve fault tolerance, two isolated 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.

1 2 3 4 5 6 7 8 ... 19 20

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Rockwell-automation T7485 ICS Regent+Plus Isolated Guarded Output Modu Manual de usuario Pagina 3

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