Rockwell-automation 1785-Lx0C15 ControlNet PLC-5 Programmable Controll Instrukcja Użytkownika Pobierz pdf (Strona 46)

1785-UM022C-EN-P - February 2008

2-8 Planning to Use Your ControlNet PLC-5 Processor

Using Immediate Data-Transfer Operations

ControlNet Immediate Data I/O transfers—Immediate Data Input

(IDI) and Immediate Data Output (IDO)—perform similarly to the

Remote-I/O supported immediate I/O transfers—Immediate Input

(IIN) and Immediate Output (IOT)—which the ControlNet system

also supports. The logic scan is temporarily interrupted while the

most recent state of up to 64 words is read from or written to the

private memory buffer.

ControlNet Data Transfer

Private

Memory

Buffers

Housekeeping

Logic Scan

Program Scan

Data-

Table

Files

Immediate Data Transfer

= Unscheduled Data Transfer

= Scheduled Data Transfer

= NUI

Data Update

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Rockwell-automation 1785-Lx0C15 ControlNet PLC-5 Programmable Controll Instrukcja Użytkownika Strona 46