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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
9 Move and Compare – FNC 10 to FNC 19
9.1 FNC 10 – CMP / Compare
1
Introduction
2
Overview
3
Instruction
List
4
Devices
in Detail
5
Specified the
Device &
Constant
6
Before
Programming
7
Basic
Instruction
8
FNC00-FNC09
Program Flow
9
FNC10-FNC19
Move & Compare
10
FNC20-FNC29
Arith. & Logic
Operation
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 FX3U and FX3UC PLCs. However, index modifiers (V and Z) are not available.
S2: This function is supported only in FX
3G/FX3GC/FX3U/FX3UC PLCs.
S3: This function is supported only in FX
3U/FX3UC 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
Real
Number
Charac-
ter String
Pointer
XYMTCSD.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
Mnemonic Operation Condition
P
FNC 10
CMP
D
16-bit Instruction
7 steps
CMP
CMPP
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
13 steps
Continuous
Operation
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
" [