Introducing The Remote I/O Adapter Module; Chapter Objectives; Module Description And Features - Allen-Bradley D Series User Manual

Chapter Objectives

Module Description and
Features

Introducing the Remote I/O Adapter Module

This chapter describes the cat. no. 1771-ASB, series D 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.
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