Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 26)

1Ć6
About How the Scanner Module Transfers Block Data
In addition to discrete data, the scanner module can also exchange
block data with remote I/O devices, such as analog I/O modules. A
blockĆtransfer request instructs the scanner module to interrupt
normal I/O scanning and transfer as many as 64 words of data to or
from a selected I/O module. Only one blockĆtransfer request per I/O
rack can be processed during a remote I/O scan.
For more information about blockĆtransfers, see chapter 14,
Configuring and Programming Block Data Transfers to AĆB I/O
Modules."
1.2.3 About the AutoMax DCSĆNET Network Functionality
The AutoMax DCSĆNET network is a serial, master/slave network
that connects together multiple AutoMax racks. GV3000 and
FlexPak 3000 drives, AutoMax PC3000s, and personal computers
(with the AutoMax PC3000 Processor or PCĆLink card installed) for a
very predictable network response rate. Communication is
performed at 875 Kbps over coaxial or fiberĆoptic cable. The number
of devices you can have is dependent upon the type of cable you
use and its length.
Each device on the network is called a drop. The master drop
initiates and controls all transmissions on the network. All
transmissions are broadcasted simultaneously. An address encoded
on each data packet identifies which slave drop is to respond to that
transmission. The slave's response is also broadcasted, with all
drops on the network receiving the response data packets.
For more information about the DCSĆNET network, see chapter 3.
1.3 About the AutoMax PC3000 Serial Card
The AutoMax PC3000 Serial card contains two opticallyĆisolated
serial ports:
D Port A is a 9Ćpin female DĆshell connector. You can configure Port
A to support either the RSĆ232 or RSĆ422 EIA interface via two
jumpers.
D Port B is a 25Ćpin female DĆshell connector. You can use this port
as an external connection for a programming terminal running
the AutoMax Programming Executive software, or you can
configure it to support DCE devices via a jumper.
Figure 1.4 illustrates the features of the AutoMax PC3000 Serial
card.