240
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
9 Move and Compare – FNC 10 to FNC 19
9.1 FNC 10 – CMP / Compare
2. 32-bit operation (DCMP and DCMPP)
The comparison value [ +1, ] and the comparison source [ +1, ] are compared with each other.
According to the result (smaller, equal or larger), either , +1 or +2 turns ON.
• The source data [ +1, ] [ +1, ] are handled as binary values.
• Comparison is executed algebraically. Example: −125400 < 22466
Caution
1. Number of occupied devices
From the device specified as , three devices are occupied. Make sure not to use those devices in another control.
Program examples
1. When comparing the current value of a counter
If it is necessary to clear the comparison result when the instruction is not executed, add the following contents under
the above program.
1) RST instruction
2) ZRST instruction
S
1
S
1
S
2
S
2
D
D
D
S
1
S
1
S
2
S
2
FNC 10
DCMP
Even if the command input turns OFF and DCMP instruction is not executed, , +1 and +2 latch
the status just before the command input turns OFF from ON.
48
49
50
51
Command
input
Command
input
S
1
+1
+2
S
2
D
D
D
D
+1,
S
2
S
2
D
+1,
D
+2,
D
+1,
S
1
S
1
Latched
Latched
Latched
D
D
D
<
Turns ON in the case of
+1, ]
S
1
S
1
+1,[
S
2
S
2
" [
] ".
=
+1, ]
S
1
S
1
Turns ON in the case of
+1,[
S
2
S
2
" [ ] ".
>
] ".
Turns ON in the case of
+1," [ ]
S
1
S
1
+1,[
S
2
S
2
D
X000
FNC 10
CMP
K100 C 20 M 0
M 0
M 1
M 2
Turns ON in the case of
"K100
>
C20 (Current value)" .
X000
C20
M0
M1
M2
99
100
101
Latched
in the
ON
status.
Latched
in the
ON
status.
Latched
in the
ON
status.
S
1
S
2
D
Turns ON in the case of
"K100 = C20 (Current value)" .
Turns ON in the case of
"K100
<
C20 (Current value)" .
X000
RST M0
RST M1
RST M2
X000
FNC 40
ZRST
M0 M2
M0 to M2 are reset.
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