3
Chapter
3-1
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
Allen-Bradley PLCs
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