Mitsubishi Electric FX3G SERIES Programming Manual page 659

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Explanation of function and operation
FNC224 to FNC230 are data comparison instructions connected to bus lines.
The contents of
S
(ON) or non-conductive (OFF) depending on the comparison result.
FNC No.
224
225
226
228
229
230
Cautions
1. Negative value
When the most significant bit is "1" in the data stored in
comparison.
• In the 16-bit operation: bit 15
• In the 32-bit operation: bit 31
2. When using 32-bit counters (including 32-bit high-speed counters)
Make sure to execute the 32-bit operation (such as "LDD=", "LDD>" and "LDD<") when comparing 32-bit counters
(C200 to C255).
If a 32-bit counter is specified in the 16-bit operation (such as "LD=", "LD>" and "LD<"), a program error or operation
error will occur.
3. Programming of data comparison instructions
When programming in GX Developer, symbols "≤" and "≥" cannot be input.
Separate "≤" into "<" and "=", and separate "≥" into ">" and "=".
The input procedure is described below:
Operating procedure
a) Display the circuit program edit window, and put the cursor in a position where a data comparison instruction
is to be used.
b) Input "Instruction" → "space" → "value or device" → "space" → "value or device".
For an input example, refer to "Instruction input window in GX Developer" shown below.
c) Click the [OK] button.
d) Input other contacts and coil drive units consecutively.
Instruction input window in GX Developer
Program example
FNC224
LD=
FNC225
LD>
FNC225
K678493
LDD>
M3
are compared with the contents of
1
16-bit instruction 32-bit instruction
LD=
LD>
LD<
LD<>
LD<=
LD>=
<Input example for 16-bit operation>
<Input example for 32-bit operation>
S S
1 2
K200 C10
X001
D200 K-30
SET
C200
28 Data Comparison – FNC220 to FNC249
28.1 FNC224~230 – LD =, >, <, <>, <=, >= / Data Comparison
in binary format, and a contact becomes conductive
S
2
ON condition
LDD=
S
LDD>
S
LDD<
S
LDD<>
S
LDD<=
S
1
LDD>=
S
1
or , it is regarded as a negative value in
S S
1 2
When the current value of the counter C10 is "200", Y010
Y10
is driven.
When the contents of D200 are "-29" or higher and X001 is
Y11
ON, Y011 is set.
When the contents of the counter C200 are less than
M50
"K678,493" or when M3 turns ON, M50 is driven.
OFF condition
≠
= S S
1 2 1
> <=
S S
1 2 1
< >=
S S
1 2 1
≠
S S =
1 2 1
<= S S >
2 1
>= <
S S
2 1
21
22
S
2
S
2
S
2
S
2
S
2
23
S
2
24
25
26
27
28
29
30
657