Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 40)

Fundamental Instruction Set
Chapter 5
5Ć3
reset to a 0. (From this point on, set means turned to the on-condition or 1.
Reset means turned to the off-condition or 0.)
If the device : The a bit in memory is:
on set
off reset
Recall that the controller scans the status of your inputs and controls your
output devices. It does not go to the input or output terminals to see if outputs
are on or off. Rather, it checks the status of the input and output devices by
scanning corresponding bits in memory. The controller uses addresses to refer
to memory bits.
Each input and output bit has a five-character address (Figure 5.1).
Figure 5.1
Instruction Address Terminology
10149-I
Concept Example
Hardware Terminology Hardware Terminology
Input (1) or Output (0)
Rack No. (1-7)
Module Group No.
(0-7)
Terminal No.
(00-07, 10-17)
Output 0
Rack No.: 1
Module Group No.: 0
Terminal No.: 12
X X / XX X
Word
Data Table Terminology
Address
Bit
Address
Instruction Address
0 0 / 12 1
Word
Address
Bit
Address
Reading from left to right:
The first number denotes the type of word corresponding to a module:
0 output
1 input
NOTE: Remember, there is only 1 rack in a Mini-PLC-2/15 system.
Address