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FX Series Programmable Controller Diagnostic Devices 6
6-4
6.3 Operation Flags
For symbol key see pa
g
e 6-1.
General note regarding input filters
• The settin
g
s for input filters onl
y
appl
y
to the main processin
g
units which use 24V DC
inputs. AC input filters are not ad
j
ustable.
Diagnostic
Device
Operation
Diagnostic
Device
Operation
M8020 (
)
Zero
Set when the result of an
ADD (FNC 20) or SUB (FNC
21) is “0”
D8020
(FX
0
/FX
0S
/
FX
0N
only)
Input filter settin
g
for devices
X000 to X007 default is 10
msec, (0-15)
M8021 (
)
Borrow
Set when the result of a SUB
(FNC 21) is less than the
min. ne
g
ative number
D8020
(FX
2N(C)
only)
Input filter settin
g
for devices
X000 to X017 default is 10
msec, (0-15)
M8022 ( )
Carr
y
Set when ‘carr
y
’ occurs dur-
in
g
an ADD (FNC 20) or
when an overflow occurs as
a result of a data shift opera-
tion
D8021
(FX
0
/FX
0S
only)
Input filter settin
g
for devices
X010 to X017 default is 10
msec, (0-15)
M8023 ( )
Float
operation fla
g
(FX
2C
only)
Set to enable floatin
g
point
operations. This fla
g
can be
used with BCD, BIN, ADD,
SUB, MUL,DIV, SQR and
FLT applied instructions
D8022 -D8027 Reserved
M8024 Reserved
M8025
(Not FX
0(S)
,
FX
0N
)
When ON HSC (FNC 53 - 55)
instructions are processed
even when the external HSC
reset input is activated
M8026
(Not FX
0(S)
,
FX
0N
)
RAMP (FNC 67) hold mode
M8027
(Not FX
0(S)
,
FX
0N
)
PR (FNC 77) 16 element
data strin
g
M8028
FX
0(S)
, FX
0N
: Chan
g
e
timers T32 to T55 to 10ms
t
y
pe
FX, FX
2C
, FX
2N
: enable
interrupts durin
g
FROM/
TO
D8028 ( )
Current value of the Z index
re
g
ister
M8029 ( )
Instruction
execution
complete
Set on the completion of
operations such as DSW
(FNC 72), RAMP (FNC 67)
etc.
D8029 ( )
Current value of the V index
re
g
ister