Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 25)

1Ć5
1.2.1 About the PC3000 Processor Functionality
The PC3000 Processor has 370K of RAM available for application
programs. It can run programs created using AutoMax Enhanced
BASIC, Enhanced Ladder Language, or Control Block languages.
The Processor supports the AutoMax multiĆtasking environment.
1.2.2 About the AĆB Remote I/O Functionality
Use the AllenĆBradley Remote I/O Scanner interface to link the
PC3000 to AllenĆBradley I/O devices that communicate via the
remote I/O link. The scanner interface can control such devices as
AllenĆBradley's 1771 I/O, Flex I/O, Block I/O, SLC 500 Remote I/O
Adapter Module and companion I/O modules, and operator
interfaces. The scanner interface can scan both discrete and analog
I/O as well as force inputs and outputs.
The scanner interface supports 1Ć, 2Ć, and 1/2Ćslot addressing of a
maximum of 32 remote racks. These racks can be either 1/4, 1/2,
3/4, or full racks. The PC3000 supports remote I/O communication
rates of 57.6, 115.2, and 230.4 Kbps and can send a maximum of 48
blockĆtransfer read or write requests of up to (and including) 64
words each.
About How the Scanner Module Transfers Discrete Data
A shared memory interface allows the scanner interface to
communicate to the remote I/O adapter devices. It exchanges
discrete data with remote I/O adapters. Figure 1.3 illustrates how
discrete data is transferred.
Adapter
Adapter
Adapter
Rack 3
Rack 2
Rack 1
Data Exchange
Shared
Memory
Interface
Program
Scan Loop
Remote I/O
Scan Loop
Program
Figure 1.3 Ć Discrete Data Transfer