Starting Your Processor
Chapter 5
5-4
You must properly address your hardware so that it relates to your ladder
diagram program.
In the ladder diagram program, the input or output instruction address is
associated with a particular I/O module terminal and is identified by a
5-digit address (Figure 5.3).
Addressing links a hardware terminal to a data table location (input), and
links a data table location to a terminal (output).
Figure 5.3
Hardware/Data Table Addressing Relationships
10146–I
Concept
Example
Hardware Terminology
Hardware Terminology
Input (1) or Output (0)
Rack No. (1-7)
I/O Group No.
(0-7)
Terminal No.
(00-07, 10-17)
Output: 0
Rack No.: 1
I/O Group No: 0
Terminal No.: 12
X X/XX
X
Word
Data Table Terminology
Address
Bit
Address
0 0/12
1
Word
Address
Bit
Address
Instruction
Address
Data Table Terminology
10327I
XXX
XX
XXX
XX
Concept
112
11
010
12
Example
Addressing Your Hardware
