Processing details
• These instructions perform a comparison operation between the double-precision real number in the device specified by
(s1) and the double-precision real number in the device specified by (s2). (Devices are used as a normally open contact.)
• The following table lists the comparison operation results of each instruction.
Instruction symbol (ladder, FBD/LD)
ED=, EQ
ED<>, NE
ED>, GT
ED<=, LE
ED<, LT
ED>=, GE
ED=, EQ
ED<>, NE
ED>, GT
ED<=, LE
ED<, LT
ED>=, GE
• If the data in the device specified by (s1) or (s2) is out of the range of setting data, the operation result will be non-continuity
(ENO OFF).
• If the LDED_ instruction is used in the program written in FBD/LD, use a left rail or a variable/constant which is always on
for EN.
• If the ORED_ instruction is used in the program written in FBD/LD and EN is set to TRUE, ENO turns on. EN will not be
an execution condition.
• When an input value is set using the engineering tool, a rounding error may occur. Refer to the following for the precautions
on setting input values using the engineering tool.
Page 49 Precautions
Operation error
There is no operation error.
Condition
(s1)=(s2)
(s1)(s2)
(s1)>(s2)
(s1)(s2)
(s1)<(s2)
(s1)(s2)
(s1)(s2)
(s1)=(s2)
(s1)(s2)
(s1)>(s2)
(s1)(s2)
(s1)<(s2)
Result
Continuity state (ENO is on.)
Non-continuity state (ENO is off.)
7 APPLICATION INSTRUCTIONS
7.9 Real Number Instructions
7
707