FX Series Programmable Controller Diagnostic Devices 6
6-9
6.4 Operation Flags (M8020 to M8029 and
D8020 to D8029)
For symbol key see page 6-1.
Note 3
• If M8024 is used with a BMOV (FNC 15) instruction, it will operate as follows;
M8024 OFF - Normal operation (Forwarding direction is [S] to [D])
M8024 ON - Reverse operation (Forwarding direction becomes [D] to [S])
This device is not supported in FX
1S and FX1N
Note 4
• The settings for input filters only apply to the main processing units which use 24V DC
inputs. AC input filters are not adjustable.
Note 5
• For Z1~Z7 and V1~V7 (D8128~D8195) please see page 6-20.
Diagnostic
Device
Operation
Diagnostic
Device
Operation
M8020 (
7)
Zero
Set when the result of an
ADD (FNC 20) or SUB (FNC
21) is “0”
D8020
(-)
See note 4
Input filter setting for devices;
X000 to X017 (FX
2N,FX2NC)
default value = 10 msec,
zero value = 50 µsec
(X000, X001: 20 µsec)
X000 to X007 (FX
1S,FX1N)
default value = 10msec
zero value = 50 µsec
(X000, X001: 10 µsec)
M8021 (
7)
Borrow
Set when the result of a SUB
(FNC 21) is less than the
min. negative number
M8022 (-)
Carry
Set when ‘carry’ occurs
during an ADD (FNC 20) or
when an overflow occurs as
a result of a data shift
operation
D8021
(-)
(Not FX1N,FX@N,
FX
2NC
See note 4
Input filter setting for devices;
X010 to X017 (FX
1S)
default value = 10 msec,
zero value = 50 µsec
M8024
(Not FX1S,FX1N)
BMOV (FNC 15) reverse
mode. See note 3
D8022 -D8027 Reserved
M8025
(Not FX1S,FX1N)
WhenONHSC(FNC53-55)
instructions are processed
even when the external HSC
reset input is activated
M8026
(Not FX1S,FX1N)
RAMP (FNC 67) hold mode
M8027
(Not FX1S,FX1N)
PR (FNC 77) 16 element
data string
M8028
Note:
Separate FX
1S and
FX
2N/2NC operation
(Not FX
1N)
FX1S: Change timers
T32~T62to10mstype
FX
2N,FX2NC:Permit
FROM/TO to interrupt
program.
(V3.00 and above)
D8028 (7)
Current value of the Z0 index
register
See note 5
M8029 (7)
Instruction
execution
complete
Set on the completion of
operations such as DSW
(FNC 72), RAMP (FNC 67)
etc.
D8029 (7)
Current value of the V0 index
register
See note 5
FX1S
FX
1N
FX
2N
FX
2NC
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