Fnc203 - Len / Character String Length Detection - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
26.4 FNC203 – LEN / Character String Length Detection
Outline
This instruction detects the number of characters (bytes) of a specified character string.
1. Instruction format
FNC 203
P
LEN
2. Set data
Operand Type
S
D
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
S
D
Explanation of function and operation
1. 16-bit operation (LEN and LENP)
The length of a character string stored in
until the first device storing "00H" is handled as a character string in units of byte.
S
Command
input
FNC203
LEN
b15----------b8
S 2nd character 1st character
4th character 3rd character
S +1
S +2 6th character 5th character
S +n 00H
It indicates the end of character string.
For example, when "ABCDEFGHI" is stored in
b15----------b8
S 42H(B)
S +1 44H(D)
S +2 46H(F)
S +3 48H(H)
S +4 00H
Mnemonic
16-bit Instruction
LEN
5 steps
LENP
Head device number storing a character string whose length is to be detected
Device number storing the detected character string length (number of bytes)
Digit Specification
S
S
D
b7-------------b0
"n"th character
b7-------------b0
41H(A)
43H(C)
"ABCDEFGHI"
45H(E)
47H(G)
49H(I)
26 Character String Control – FNC200 to FNC209
26.4 FNC203 – LEN / Character String Length Detection
→ For handling of character strings, refer to Section 5.3.
Operation Condition
32-bit Instruction
Continuous
Operation
Pulse (Single)
Operation
Description
Word Devices
Special
System User Index
Unit
V Z Modify K H
and later is detected, and stored to
b15---------------b0
Character string
D
length
and later as shown below, K9 is stored to
S
b15---------------b0
D 9
Mnemonic Operation Condition
⎯
⎯
Data Type
Character string
16-bit binary
Others
Con- Real Charac-
Pointer
stant Number ter String
E " " P
. Data starting from
D
.
D
655
21
22
23
24
25
26
27
28
29
30