Rockwell Automation 1747-PCIS API Software - Open Controller - Manual (Page 16)

Publication 1747-UM002A-US-P - June 2000
1-4 Overview
Understanding the 1746 I/O
PCI Interface Architecture The 1746 I/O PCI Interface architecture consists of a PCI card that
plugs into a PC and cables to a 1746 I/O chassis. The scanner scans
the 1746 local I/O bus and reads/writes inputs and outputs to/from
the dual port registers.
Understanding the Open
Controller Architecture The open controller architecture consists of two CPUs (scanner and
controller) that share dual-port memory. The scanner scans the 1746
local I/O bus and reads/writes inputs and outputs to/from the
dual-port registers. The controller has a PC-based architecture with a
266Mhz Pentium to run your application software.
1746 backplane interface
1747-PCIL
status and user LEDs
3-position switch
user jumper
watchdog contact
dual port memory
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p‚€€hq† ‰h vhiyr
r†ƒ‚†r ‰h vhiyr
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vƒˆ‡Ãv€htr ‰h vhiyr
u‚†‡Ãqh‡h ‰h vhiyr
1747-PCIS
cable
PCI bus
Scanner
CPU
to 1746 PCI bus
dual port memory
Open Controller CPU module
266MHz
Pentium
disk bus
memory
scanner
firmware
80188
CPU
bus
memory
scanner
to 1746 local
I/O bus
Partition: Bytes:
register 1K
commands variable
responses variable
output image variable
input image variable
host data variable
application
software
BIOS OS
controller (PC-based architecture)
PCI