Mitsubishi Electronics FX3G User Manual
245
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
9 Move and Compare – FNC 10 to FNC 19
9.1 FNC 10 – CMP / Compare
1
Introdu
ction
2
Ov
ervi
ew
ew
3
Instruction
Li
st
4
D
evices
in Det
ai
l
5
Specifi
ed the
De
vice
&
C
onst
ant
ant
6
Bef
ore
ore
Pr
og
ra
mmi
ng
ng
7
Bas
ic
ic
Instruction
8
FN
C00-FN
C00-FN
C0
9
Program Fl
ow
9
FNC
10-FN
C19
Mov
e & Com
e & Com
pare
10
FNC
20-FNC
29
Arith. & Lo
gi
c
Operati
on
9.1
FNC 10 – CMP / Compare
Outline
This instruction compares two values, and outputs the result (smaller, equal or larger) to bit devices (3 points).
→ For the contact comparison instruction, refer to Chapter 28.
→ For floating point comparison, refer to Section 18.1.
1. Instruction format
2. Set data
3. Applicable devices
S1: "D .b" is available only in FX
3U
and FX
3UC
PLCs. However, index modifiers (V and Z) are not available.
S2: This function is supported only in FX
3G
/FX
3GC
/FX
3U
/FX
3UC
PLCs.
S3: This function is supported only in FX
3U
/FX
3UC
PLCs.
Explanation of function and operation
1. 16-bit operation (CMP and CMPP)
The comparison value
and the comparison source
are compared with each other. According to the
result (smaller, equal or larger), either one among
,
+1 or
+2 turns ON.
• The source data
are handled as binary values.
• Comparison is executed algebraically. Example:
−10 < 2
Operand Type
Description
Data Type
Data or device number handled as comparison value
16- or 32-bit binary
Data or device number handled as comparison source
16- or 32-bit binary
Head bit device number to which comparison result is output
Bit
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D .b KnX KnY KnM KnS T C D
R
U \G
V Z Modify K H
E
" "
P
S2
S3
S2
S3
S1
DCMP
DCMPP
DCMPP
Mnemonic
Operation Condition
P
FNC 10
CMP
D
16-bit Instruction
7 steps
CMP
CMPP
CMPP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Pulse (Single)
Operation
32-bit Instruction
13 steps
Continuous
Operation
Pulse (Single)
Pulse (Single)
Operation
S
1
S
2
D
S
1
S
2
D
S
1
S
2
D
D
D
S
1
S
2
FNC 10
CMP
S
1
Even if the command input turns OFF and CMP instruction is not executed, , +1 and +2 latch
the status just before the command input turns OFF from ON.
Command
input
48
49
50
51
Latched
Latched
+1
+2
Latched
Command
input
S
2
D
D
S
1
S
2
D
D
D
+1
D
+2
D
D
D
D
<
S
1
S
2
] ".
Turns ON in the case of
" [
" [
=
S
1
S
2
] ".
Turns ON in the case of
" [
" [
>
S
1
S
2
] ".
Turns ON in the case of
" [
" [