Rockwell-automation T3464 ICS Regent AC Guarded Digital Output Module Manual de usuario descargar pdf (Pagina 4)

AC Guarded Digital Output Module

(T3464)

Industrial Control Services

Table

. Output States After Switch Failure.

Case

Commanded

Output State

Single

Failure

Actual

Output

to Load

Remarks

TRIAC

short

Continued correct control.

Automatic testing of crowbar

circuit ensures that output will be

able to switch off. If output is

subsequently commanded off,

crowbar switch is energized to

blow fuse and turn off output

(fuse blows 200 msec after

output is commanded off).

TRIAC

open

Off

Fail

safe output. Automatic

testing detects failed TRIAC.

Crowbar

fault

Continued correct control.

Automatic testing detects failed

crowbar circuit. If output is

subsequently commanded off,

TRIAC will turn off.

Off

TRIAC

short

200

msec

bump

A one

time, 200 msec maximum

state bump occurs when the

TRIAC shorts. Automatic testing

detects shorted TRIAC and

crowbar switch is activated to

blow fuse. This one

time bump

may not be suitable for certain

energize

trip applicatio

ns.

Off

TRIAC

open

Off

Fail

safe output. Automatic

testing detects failed TRIAC. If

output is subsequently

commanded on, output will

remain off.

Off

Crowbar

fault

Off

Continued correct control.

Automatic testing detects failed

crowbar circuit. If output is

subsequently commanded on,

TRIAC will turn on.

Testing and Diagnostics

The voter and I/O bus interface logic of 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

majority

voted result to the processors produces an I/O

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