Rockwell-automation T3408 ICS Regent DC Digital Input Modules Instrukcja Użytkownika Pobierz pdf (Strona 2)

DC Digital Input Modules

(T3401, 02, and 08)

Industrial Control Services

Module Operation

A block diagram of a typical DC digital input module is shown

in Figure

Optical isolation between field wiring and the module

s’ logic

circuitry provides field

logic isolation —

protecting the

modules’ logic circuits from field signal over

voltages,

transients, and other electrical disturbances. It also provides

a safety barrier between the primary field voltages and user

accessible circuits.

Figure

. Block Diagram of DC Digital Input Module.

When the field switch is closed, the input to the module is on.

When the field switch opens, the input to the module turns off.

Data f

rom the logic side of the optical isolators are bused to

the I/O bus interface logic.

The processor modules send triplicated read data requests to

the input module over the I/O Safetybus. The processors’

addressing data and data read requests are voted by the

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Rockwell-automation T3408 ICS Regent DC Digital Input Modules Instrukcja Użytkownika Strona 2