Chapter 16 PLC Function ApplicationsMS300 (High Speed Model)
16-90
API
LD※
S1 S2
Contact form compare LD*
224~
230
D
Bit device Word device
16-bit command (5 STEP)
LD※
Continuous
execution type
－ －
32-bit command (9 STEP)
DLD※
Continuous
execution type
－ －
Flag signal: none
X Y M K H KnX KnY KnM T C D
S1
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
S2
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
Notes on operand usage: ※：=、>、<、<>、≦、≧
Please refer to the function specifications table for each device in
series for the scope of device usage
S
1
: data source device 1. S
2
: data source device 2.
This command compares the content of S
1
and S
2
. Taking API 224 (LD=) as an
example, this command will be activated when the result of comparison is
"equal," and will not be activated when the result is "unequal."
The LD* can be used while directly connected with the busbar
API No. 16-bit commands 32-bit commands
Conditions for
activation
Conditions for
inactivation
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
When the content of C10 is equal to K200, Y10=On.
When the content of D200 is greater than K-30, and X1=On, Y11=On and remains
in that state.
LD=
K200 C10
DLD>
K678493 C20
M3
Y10
LD>
D200 K-30
SET Y11
M50
X1
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