Allen-Bradley PLC-5 Manual de usuario descargar pdf (Pagina 48)

1785-UM022B-EN-P - February 2002

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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Allen-Bradley PLC-5 Manual de usuario Pagina 48