Rockwell Automation 1791-IOBB USER MANUAL - Manual (Page 7)

Chapter
1
1Ć1
Introducing Block I/O
In this chapter you will learn what block I/O is, its features, and how it
functions.
1791–IOBA/B and –IOBB/B block I/O modules are small, self–contained
remote I/O devices complete with power supply, programmable controller
interface, input/output connections and signal conditioning circuitry.
The 1791–IOBA/B has 8 inputs and 8 outputs; the 1791–IOBB/B has 10
inputs and 6 outputs. In all other aspects, they are identical.
The blocks are compatible with PLC–2

, PLC–3

, and PLC–5

family
programmable controllers, and the SLC

500 modular controllers. Refer to
the table below for information on using block I/O with various
Allen-Bradley programmable controllers.
If You are Using: You must use:
PLC-2 family programmable controller
1771-SN sub-I/O scanner or
1771-SD2 remote I/O scanner
PLC-3 family programmable controller
Block attaches directly to controller
PLC-5 family programmable controller
Block attaches directly to controller
SLC 500 programmable controller
1747-DSN scanner or
1747-SN remote I/O scanner
Figure 1.1 shows the physical features of the block I/O.
Figure 1.1
Major Features of the Block I/O Module (1791-IOBA/B shown)
OUTPUT
INPUT
COMM POWER
Removable Remote I/O Link Connector
Communication LED Power LED Status Indicators Switch Assemblies
Removable Input/Output Connector
DH-485 Port
10825-I
Chapter Objectives
General Description