Transferring discrete and blockćtransfer data – Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual User Manual
Page 96
Chapter
8
8-1
Transferring Discrete and BlockĆTransfer 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:
DiscreteĆtransfer data
BlockĆtransfer data
Example ladder logic
8Ć1
Scanner mode:
DiscreteĆtransfer data
BlockĆtransfer data
Programming considerations
You can transfer data in adapter mode in two ways.
If you want to transfer:
Use this method:
Words to/from a digital I/O module
DiscreteĆdata transfer
Words to/from a digital I/O module DiscreteĆdata transfer
Blocks of data (up to 64 words) to/from a
blockĆtransfer 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
processor’s 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