Mitsubishi FX3U Series Programming Manual

277
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
10 Arithmetic and Logical Operation ( + , − , × , ÷ ) – FNC 20 to FNC 29
10.6 FNC 25 – DEC / Decrement
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
10.6 FNC 25 – DEC / Decrement
Outline
This instruction decrements the data of a specified device by "1".
1. Instruction format
2. Set data
3. Applicable devices
S: This function is supported only in FX3U/FX3UC PLCs.
Explanation of function and operation
1. 16-bit operation (DEC and DECP)
The contents of are decremented by "1", and the decremented result is transferred to .
2. 32-bit operation (DDEC and DDECP)
The contents of [ +1, ] are decremented by "1", and the decremented result is transferred to [ +1,
].
Cautions
1. Flag operations
1) 16-bit operation
When "−32768" is decremented by "1", the result is "+32767". Flags (zero, carry and borrow) are not activated at
this time.
2) 32-bit operation
When "−2,147,483,648" is decremented by "1", the result is "+2,147,483,647". Flags (zero, carry and borrow) are
not activated at this time.
Operand type Description Data type
Word device number storing data to be decremented by "1" 16- or 32-bit binary
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 VZModifyKH E ""P
3333333 S 33 3
DDEC
DDECP
Mnemonic Operation Condition
P
FNC 25
DEC
D
16-bit Instruction
3 steps
DEC
DECP
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
5 steps
Continuous
Operation
Pulse (Single)
Operation
D
D
D D
Command
input
FNC 25
DECP
D 
− 1 →
D  D 
D D D
D
Command
input
FNC 25
DDECP
D 
D 
[ +1, ] − 1 → [ + 1, ]
D  D  D 

Mitsubishi FX3U Series Specifications

General

Model	FX3U Series
Program Memory	64k steps
Execution Speed	0.065 μs/basic instruction
Type	PLC (Programmable Logic Controller)
Power Supply	100-240V AC
I/O Points	Up to 384
Communication	USB
Expansion	Supported via expansion modules
High-Speed Counters	Up to 6 channels
Analog Input/Output	Available via expansion modules
Temperature Range	0 to 55°C
Programming Language	Ladder Logic, Structured Text
Built-in Functions	PID control
Humidity	5 to 95% (non-condensing)