YASKAWA MP3300 series, Product Manual

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3.1 Basic Functionality
3.1.2 Registers
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CPU Module Functionality
3.1.2 Registers
Registers are areas that store data within the Machine Controller. Variables are registers with
labels (variable names).
There are two kinds of registers: global registers that are shared between all programs, and
local registered that are used only by a specific program.
Global Registers
Global registers are shared by ladder programs, user functions, motion programs, and
sequence programs. Memory space for global registers is reserved by the system for each reg-
ister type.
Local Registers
Local registers can be used within each specific drawing. These registers cannot be shared by
other drawings. Local registers are stored in the program memory for each drawing.
Ladder Program Conceptual Diagram
Ladder
program
U s er function s Motion
program s /
s equence
program s
Global regi s ter s
S regi s ter s
65,5 3 5
word s
M regi s ter s
1,048,576
word s
G regi s ter s
2,097,152
word s
I regi s ter s
65,5 3 6
word s
Input data +
Monitor
parameter s +
CPU interface
input s
O regi s ter s
65,5 3 6
word s
Output data +
S etting
parameter s +
CPU interface
output s
C regi s ter s
16, 3 84
word s
H01 FUNC01 FUNC02 H
Parent drawing
# regi s ter s
Child drawing
# regi s ter s
U s er function
X regi s ter s
U s er function
X regi s ter s
D regi s ter s D regi s ter s
Y regi s ter s
Z regi s ter s
# regi s ter s
D regi s ter s
Y regi s ter s
Z regi s ter s
# regi s ter s
D regi s ter s
The s e regi s ter s cannot be s hared between
different drawing s .
The s e regi s ter s cannot be s hared between
different drawing s .