Mitsubishi Electric MELSEC iQ-F FX5 Programming Manual page 174

Processing details
• These instructions perform a comparison operation between the 32-bit binary data in the device specified by (s1) and the
32-bit binary data in the device specified by (s2) and according to the result (small, equal, large), (d), (d) + 1, or (d) + 2 is
turned ON.
• (s1) and (s2) are handled as binary values within the range of above data setting.
• Large and small comparison is executed algebraically.
• With sign...
• Without sign...
X0
DCMP
(d)
Turns ON in the case of (s1)>(s2).
(d)+1
Turns ON in the case of (s1)=(s2).
(d)+2
Turns ON in the case of (s1)<(s2).
(1)
(1): Even if the command input turns OFF and the DCMP instruction is not executed, (d) to (d)+2 latches the status just before the command input turns from
ON to OFF.
Precautions
Three devices are occupied from the device specified in (d). Make sure that these devices are not used in other controls.
Operation error
Error code Description
(SD0/SD8067)
2820H The range of 3 points of data starting from the device specified by (d) exceeds said device.
7 BASIC INSTRUCTIONS
172
7.1 Comparison Operation Instructions
-125400 (FFFE1628H) < 224566 (00036D36H)
16776690 (00FFFDF2H) < 4294967176 (FFFFFF88H)
(s1) (s2) (d)
X0
50
49
(s2) 48
(s1)
(d)
Latched
(d)+1
(d)+2
51
Latched
Latched