Rockwell Automation 1771-ASB/E Remote I/O Adapter User Manual - Manual (Page 11)

Chapter
1
Publication 1771-UM001A-US-P - February 2000
Introducing the Remote I/O
Adapter Module
This chapter describes the cat. no. 1771-ASB, series E remote I/O
adapter module:
module description and features
hardware
components
The remote I/O adapter module serves as an interface between
remote I/O modules and programmable controllers. The remote I/O
adapter:
•
transmits data up to 10,000 cable-feet (at 57.6K baud)
•
provides faster backplane scanning and data transmission up 2500
cable-feet at 230.4K baud
•
receives/sends data from/to the I/O scanner in serial form
•
reads/writes data from/to the input modules in parallel form
•
reads/writes data from/to the output modules in parallel form
•
supports any mix of I/O (4, 6, 8, 16 or 32 points)
•
supports three methods of I/O addressing; 1/2-slot, 1-slot and
2-slot
•
checks I/O configuration on power-up to verify I/O module
placement
•
scans all slots in the chassis, or all but the last four slots, allowing
improved scan time and I/O image space savings. Slot power
supplies can be used in the last quarter of the rack without using
I/O space.
•
can emulate series B adapters, providing system response similar
to the 1771-ASB series B. This allows use of 1771-S4A and -S4B
scanners which require slower response for proper operation.
•
has enhanced diagnostic indicators for easier troubleshooting.
Chapter Objectives
Module Description and
Features