7.1 User Program Types and Execution Timing
7.1.5 Registers
7
Cr
eating U
s
er Pr
ogram
s
7-29
Local Registers
Local registers are valid within only one specific program. The local registers in other programs
cannot be accessed.
You specify the usable range from the MPE720.
Note: n: decimal digit, h: hexadecimal digit
Type
Name
Designation
Methods
Description
Features
#
# registers
#Bnnnnnh,
#Wnnnnn,
#Lnnnnn,
#Qnnnnn,
#Fnnnnn,
#Dnnnnn,
#Annnnn
These registers can be read in programs but they
cannot be written.
The values are set from the MPE720.
Program-
specific
D
D registers
DBnnnnnh,
DWnnnnn,
DLnnnnn,
DQnnnnn,
DFnnnnn,
DDnnnnn,
DAnnnnn
These registers can be used for general purposes
within a program.
By default, 32 words are reserved for each program.
The default value after restart depends on the setting
of the
D Register Clear when Start
option.
Refer to the following section for details.
Program-
specific
X
Function input
registers
XBnnnnnh,
XWnnnnn,
XLnnnnn,
XQnnnnn,
XFnnnnn,
XDnnnnn
These registers are used for inputs to functions.
•
Bit inputs: XB000000 to XB00000F
•
Integer inputs: XW00001 to XW00016
•
Double-length integers: XL00001 to XL00015
•
Quadruple-length integers: XQ00001 to XQ00013
•
Real numbers: XF00001 to XF00015
•
Double-precision real numbers: XD00001 to
XD00013
Function-
specific
Y
Function output
registers
YBnnnnnh,
YWnnnnn,
YLnnnnn,
YQnnnnn,
YFnnnnn,
YDnnnnn
These registers are used for outputs from functions.
•
Bit outputs: YB000000 to YB00000F
•
Integer outputs: YW00001 to YW00016
•
Double-length integers: YL00001 to YL00015
•
Quadruple-length integers: YQ00001 to YQ00013
•
Real numbers: YF00001 to YF00015
•
Double-precision real numbers: YD00001 to
YD00013
Z
Function internal
registers
ZBnnnnnh,
ZWnnnnn,
ZLnnnnn,
ZQnnnnn,
ZFnnnnn,
ZDnnnnn
These are internal registers that are unique within
each function. You can use them for internal pro-
cessing in functions.
•
Bits: ZB000000 to ZB00063F
•
Integers: ZW00000 to ZW00063
•
Double-length integers: ZL00000 to ZL00062
•
Quadruple-length integers: ZQ00000 to ZQ00060
•
Real numbers: ZF00000 to ZF00062
•
Double-precision real numbers: ZD00000 to
ZD00060
A
Function external
registers
ABnnnnnh,
AWnnnnn,
ALnnnnn,
AQnnnnn,
AFnnnnn,
ADnnnnn
These are external registers that use the address
input value as the base address.
When the address input value of an M or D register is
provided by the source of the function call, then the
registers of the source of the function call can be
accessed from inside the function by using that
address as the base.
