Rockwell-automation T3411 ICS Regent Monitored Digital Input Modules Bedienungsanleitung PDF herunterladen (Seite 21)

Monitored Digital Input Modules

(T3411)

6031

Mar

Field wiring open circuit or short circuit conditions are

referenced in the application program using the Fault Name

tag names defined in the I/O configuration Editor. When a

line monitor device is installed across the field switch and the

wiring is healthy, the Fault Name status is on. If there is a

short or open circuit (or there is no line monitor device

installed) the Fault Name status is off.

The status of the Name and Fault Name input variables are

summarized in Table

for the various field input conditions.

Table

. Input Status for Field Input Conditions.

With Line Monitor Device

Installed

Without Line Monitor

Device Installed

Field Input

Condition

Name

Fault Name

Name

Fault Name

Switch Open

OFF

Switch Closed

OFF

Open Circuit

OFF

Same as Switch Open

Short Circuit

OFF

Same as Switch Closed

Programming Dual Fault Tolerant Monitored Inputs

To program fault tolerant configurations using dual

monitored input modules, ladder logic is used to check the

status of the inputs and the system control relays (that report

a faulted I/O module) and provide a voted input value. Two

examples are shown below.

Normally Energized Inputs

Figure

shows a ladder logic rung that would be suited for

normally energized inputs that de

energize to trip.

Figure

. Dual Voting for Normally Energized Inputs.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26

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