Chapter 14 PLC Function |C200 Series
14-59
API
224~
230
D
LD※
S1 S2
Load Compare※
Bit Devices Word Devices
X Y M K H KnX KnY KnM T C D
S
1
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
S
2
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
Operands: ※: =, >, <, <>,≦,≧
Please refer to the specifications of each model for the
range of operands.
16-bit command (5 STEPS)
LD※
ZRSTP
32 位 bits command (9 STEPS)
DLD※
－ － －
Flag signal: none
Explanation
1. S
1
: Data source device 1 S
2
: Data source device 2
2. This instruction compares the content in S
1
and S
2
. Take API224 (LD=) for
example, if the result is “=”, the continuity of the instruction is enabled. If the
result is “≠”, the continuity of the instruction is disabled.
3. LD (※ :※ =, >, <, <>, ≤, ≥) instruction is used for direct connection with BUS.
API No.
16 -bit
instruction
32 -bit
instruction
Continuity
condition
No-continuity
condition
224
LD＝ DLD＝ S
1
＝ S
2
S
1
≠ S
2
225
LD＞ DLD＞ S
1
＞ S
2
S
1
≦ S
2
226
LD＜ DLD＜ S
1
＜ S
2
S
1
≧ S
2
228
LD＜＞ DLD＜＞
S
1
≠ S
2
S
1
＝ S
2
229
LD＜＝ DLD＜＝
S
1
≦ S
2
S
1
＞ S
2
230
LD＞＝ DLD＞＝
S
1
≧ S
2
S
1
＜ S
2
Example
1. When the content in C10 = K200, Y10 = On.
2. When the content in D200 > K-30 and X1 = On, Y11= On will be retained.
OR
C0 C10
DOR
D10 D20
&
I
Y0
X2
X1
M30
M60
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