Mitsubishi FX3G Series Programming Manual page 655

FX /FX /FX /FX
3G 3U 3GC 3UC
Programming Manual - Basic & Applied Instruction Edition
Explanation of function and operation
FNC240 to 246 are data comparison instructions connected to other contacts in parallel.
The contents of
S
(ON) or non-conductive (OFF) depending on the comparison result.
FNC No.
240
241
242
244
245
246
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 "ORD=", "ORD>" and "ORD<") when comparing 32-bit counters
(C200 to C255).
If a 32-bit counter is specified in the 16-bit operation (such as "OR=", "OR>" and "OR<"), 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
X001
S
1
FNC240
K200
OR=
X002 M30
FNC246
D100
ORD>=
Series
are compared with the contents of
1
16-bit instruction 32-bit instruction
OR=
OR>
OR<
OR<>
OR<=
OR>=
<Input example for 16-bit operation>
<Input example for 32-bit operation>
Y000
S
2
C10
M60
K100000
28 Data Comparison – FNC220 to FNC249
28.3 FNC240~246 – OR=, >, <, < >, <=, >= / Data Comparison
in binary format, and a contact becomes conductive
S
2
ON condition
ORD=
S
1
ORD>
S
1
ORD<
S
1
ORD<>
S
1
ORD<=
S
1
ORD>=
S
1
or , it is regarded as a negative value in
S S
1 2
When X001 turns ON or when the current value of the
counter C10 is "200", Y000 is driven.
When X002 and M30 turn ON or when the contents of the
data registers D101 and D100 are more than "K100,000"
M60 is driven.
OFF condition
≠
= S S S
2 1
> S S <= S
2 1
< >=
S S S
2 1
≠
S S = S
2 1
<= S S > S
2 1
>= <
S S S
2 1
653
21
22
2
2
2
2
2
23
2
24
25
26
27
28
29
30