Mitsubishi MELSEC Q Series Programming Manual page 731

(c) The following table shows processing details of bits to be compared.
n value for n value for
comparison of comparison of
specified date data specified date data
with given date data with current date data
0001 8001
H
0002 8002
H
0003 8003
H
0004 8004
H
0005 8005
H
0006 8006
H
0007 8007
H
Other than 0001 to 0007 ,8001
H H
(7) If the data stored in the devices to be compared are not recognized as date data, SM709 will
be turned on after the instruction execution and no-conductive status will be made. Even if
they are not recognized as date data but the range of the devices is within the setting range,
SM709 will not be turned on.
Moreover, if the range of devices specified by
specified devices, SM709 will be turned on after the instruction execution and no-conductive
status will be made.
Once SM709 is turned on, on-status will be retained till when the CPU modules are reset or
powered off. Therefore, turn off SM709 if necessary.
(8) The following table shows the comparison operation results for each instruction.
Instruction
Condition
symbols in
=
DT =
S2
S1
<>
DT
S2
S1
>
>
DT
S2
S1
<=
DT
S2
S1
<
<
DT
S2
S1
>=
DT
S2
S1
Date to be
compared
Day
H
Month
H
Month, day
H
Year
H
Year, day
H
Year, month
H
Year, month, day
H
to 8007 No objects
H H
S1
Instruction
Comparison
operation result
symbols in
Conductive status
(DT=,DT<>,DT>,DT<=,DT<,DT>=)
Processing details
Comparison of days (
Comparison of months (
Comparison of months ( +1) and days (
S1
Comparison of years (
Comparison of years ( ) and days (
S1
Comparison of years ( ) and months (
S1
Comparison of years (
S1
and days (
S1
No comparison of years (
S1
and days ( +2) (Non-conductive)
S1
to +2 or to +2 exceeds the range of
S1 S2 S2
Condition
=
DT
S2
S1
<>
=
DT
S2
S1
>
DT
S2
S1
<=
>
DT
S1 S2
<
DT
S2
S1
>=
<
DT
S1 S2
1
2
+2)
S1
+1)
S1
3
+2)
S1
)
S1
4
+2)
S1
+1)
S1
), months ( +1),
S1
6
+2)
), months ( +1),
S1
6
7
8
Comparison
operation result
No-conductive
status
7-357