Rockwell Automation 1771-ASB/E Remote I/O Adapter User Manual - Manual (Page 31)

Chapter
3
Publication 1771-UM001A-US-P - February 2000
Addressing Modes for Your
Remote I/O
When you configure your remote I/O system, you must consider:
•
how to address your I/O
•
what combination of I/O modules and I/O chassis you can use
These topics are discussed in this chapter.
Programmable controllers that use the 1771-ASB remote I/O adapter
module can address their I/O in 2-slot, 1-slot or 1/2 slot I/O groups.
These three addressing methods are referred to as 2-slot addressing,
1-slot addressing and 1/2-slot addressing.
You select the addressing method with switch 5 and 6 in the I/O
chassis backplane switch assembly. You make this selection for each
chassis independently with only one method of addressing for each
chassis.
I/O groups are made up of I/O terminals (Figure 3.1). An I/O group
is an addressing unit that can contain up to 16 input terminals and 16
output terminals. You select an I/O chassis to have either 2-slot,
1-slot or 1/2-slot I/O groups.
Chapter Objectives
Hardware Addressing