112
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.9 Extension Register [R] and Extension File Register [ER]
4.9.5
Functions and operation examples of extension registers
Extension registers can be used in various control with numeric data in the same way as data registers.
This subsection explains operations in representative basic instructions and applied instructions among
various applications.
For the full use of extension registers, refer to the explanation of applied instructions described later.
1. Extension registers in basic instruction
• Specifying an extension register as the set value of a timer or counter
A counter or timer operates while regarding the contents
of a specified data register as the set value.
2. Extension registers in applied instruction
Operation examples in FNC 12 (MOV) instruction
• Changing the current value of a counter
The current value of the counter C2 is changed to the
content of R5.
• Reading the current value of a timer or counter to an extension register
The current value of the counter C10 is transferred to R4.
• Storing a numeric value to extension registers
"200 (decimal value)" is transferred to R10.
"80000 (decimal value)" is transferred to R10 and R11.
Because a numeric value larger than 32767 is 32-bit
data, 32-bit operation (double D instruction) is required.
When a data register on the low-order side (R10) is
specified, a data register on the high-order side (R11) is
automatically occupied.
• Transferring the contents of a data register to another extension register
The contents of D10 are transferred to R20.
T 2
R 0
C 10
R 20
FNC 12
MOV
R 5
C 2
FNC 12
MOV
C 10
R 4
FNC 12
MOV
K200
R 10
16 bits
FNC 12
DMOV
K80000 R10(R11)
32 bits
FNC 12
MOV
D 10
R 20
