7 APPLICATION INSTRUCTIONS
7.25 Clock Instructions
1015
7
• When 0 is set to the 0 to 2 bits, the date data are not compared. When 1 is set, the entire date data (year, month, and day)
are compared.
• When 0 is set to the 15 bit, the data in the device specified by (s1) and the date data in the device specified by (s2) are
compared. When 1 is set, the data in the device specified by (s1) is compared with the current date. The date data in the
device specified by (s2) is ignored.
• The following table lists processing details of each bit.
• If the comparison target data in the device are not recognized as date data, SM709 turns on after the instruction is executed
and the operation result will be non-continuity. Even if the data are not recognized as date data, SM709 does not turn on if
the data are within the setting range. If the device areas specified by (s1) to (s1)+2 or (s2) to (s2)+2 exceed the setting area
in the device/label memory, SM709 turns on after the instruction is executed and the operation result will be non-continuity
as well. Once SM709 turns on, the on state is held until the CPU module is powered off or reset. Turn off SM 709 as
needed.
• The following table lists the comparison operation results of each instruction.
The date data A, B, and C are compared.
(s3) value when
comparing two
specified date data
(s3) value when
comparing the
specified date data
with the current date
Comparison
target
Description
0001H 8001H Day Only data in the device specified by (s1)+2 is compared.
0002H 8002H Month Only data in the device specified by (s1)+1 is compared.
0003H 8003H Month, day Data in the device areas specified by (s1)+1 and (s1)+2 are compared.
0004H 8004H Year Only data in the device specified by (s1) is compared.
0005H 8005H Year, day Data in the device areas specified by (s1) and (s1)+2 are compared.
0006H 8006H Year, month Data in the device areas specified by (s1) and (s1)+1 are compared.
0007H 8007H Year, month, day The entire date data in the device areas specified by (s1), (s1)+1, and (s1)+2
are compared.
Other than 0001H to 0007H, 8001H to 8007H None The entire date data in the device areas specified by (s1), (s1)+1, and (s1)+2
are not compared. (The operation result will be non-continuity.)
Instruction symbol (ladder, FBD/LD) Condition Result
DT=, EQ (s1)=(s2) Continuity state (ENO is on.)
DT<>, NE (s1)(s2)
DT>, GT (s1)>(s2)
DT<=, LE (s1)(s2)
DT<, LT (s1)<(s2)
DT>=, GE (s1)(s2)
DT=, EQ (s1)(s2) Non-continuity state (ENO is off.)
DT<>, NE (s1)=(s2)
DT>, GT (s1)(s2)
DT<=, LE (s1)>(s2)
DT<, LT (s1)>(s2)
DT>=, GE (s1)<(s2)
A
(2006/9/22)
B
(2007/6/23)
C
(2008/8/8)
2009/1/12008/1/12007/1/12006/1/1
To Next Page
Loading...
