Rockwell Automation 1791-I0VW USER MANUAL - Manual (Page 6)

Chapter
1
1-1
Introducing Block I/O
In this chapter you will learn what block I/O is, its features, and how
it functions.
Block I/O consists of small, self-contained remote I/O devices complete
with power supply, programmable controller interface, input/output
connections and signal conditioning circuitry.
The 1791-IOBW 24V dc module has 32 sink input channels, and 32 source
output channels.
The 1791-IOVW 24V dc module has 32 source input channels, and 32 sink
output channels.
Complete specifications for these modules are contained in Appendix A.
The blocks are compatible with PLC-2

, PLC-3

, and PLC-5

family
programmable controllers, and the SLC 500

modular controllers. When
used with PLC-2 family programmable controllers, a sub-scanner module
is used to communicate with the blocks. When used with PLC-3 and
PLC-5 family programmable controllers, they can be connected directly to
the controller or to a scanner module. When used with SLC 500
controllers, a 1747-SN remote I/O scanner is used to communicate with the
blocks.
ATTENTION: However, when using PLC-3 programmable
controllers, you must use a 1775-S5 or -SR5 scanner module.
Do not use 1775-SR, -S4A or -S4B scanner modules.
Note: The 1791-IOBW and -IOVW block modules are not compatible
with the 1747-DSN scanner module.
Connections are made to removable terminal blocks mounted on the sides
of the block.
Figure 1.1 shows the physical features of the block I/O.
Chapter Objectives
General Description