Rockwell Automation 1785 PLC-5 User Manual Page 96

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Chapter
8
8-1
Transferring Discrete and BlockTransfer Data
This chapter covers discrete and block transfer of I/O data when a
processor is configured for either adapter or scanner mode. Discrete-
transfer data are words transferred to/from a digital discrete I/O module.
Block-transfer data is transferred, in blocks of data of up to 64 words,
to/from a block-transfer I/O module (such as an analog module).
If you want to read about: Go to
page:
Adapter mode:
Discretetransfer data
Blocktransfer data
Example ladder logic
81
84
87
810
Scanner mode:
Discretetransfer data
Blocktransfer data
816
816
817
Programming considerations 821
You can transfer data in adapter mode in two ways.
If you want to transfer: Use this method:
Wordsto/fromadigitalI/Omodule DiscretedatatransferWords to/from a digital I/O module Discretedata transfer
Blocks of data (up to 64 words) to/from a
blocktransfer module (such as an analog module)
Block transfer
The processor transfers discrete and block I/O data in a similar way.
The adapter-mode processor and the supervisory processor automatically
discrete transfer I/O data between themselves via the supervisory
processors remote I/O scan.
Chapter
Objectives
Transferring Data Using
Adapter Mode
System Design
Determined
Choosing
Communication
Transferring Discrete
and Block Data
Planning Your
System Programs
Selecting Interrupt
Routines
Calculating Program
Timing
Choosing Hardware
Placing System
Hardware
Assigning Addressing
Mode, Racks,
and Groups
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