Eaton ELC-PB, Programming Manual

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3 . I n s t r u c t i o n S e t
M N 0 5 0 0 3 0 0 3 E F o r m o r e i n f o r m a t i o n v i s i t : w w w. e a t o n . c o m
3 - 5 0 5
API Mnemonic Operands Function
224~
230
D
L D *
S
1
, S
2
Contact Comparison
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S
1
* * * * * * * * * * *
S
2
* * * * * * * * * * *
LD*: 5 steps
DLD*: 9 steps
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
S
1
: Data source value 1 S
2
: Data source value 2
Description:
1. Compare the S1 and S
2
. For example, “LD=” compares S
1
and S
2, and
if the comparison result
is “=”, the instruction is true. If they are not “=” the instruction is false.
2. This instruction must be the first instruction of a rung.
API No.
16 -bit
instruction
32 -bit
instruction
Instruction is
true
Instruction is
false
224
LD
＝
D LD
＝
S
1
＝
S
2
S
1
≠
S
2
225
LD
＞
D LD
＞
S
1
＞
S
2
S
1
≦
S
2
226 LD
＜
D LD
＜
S
1
＜
S
2
S
1
≧
S
2
228
LD
＜＞
D LD
＜＞
S
1
≠
S
2
S
1
＝
S
2
229
LD
＜＝
D LD
＜＝
S
1
≦
S
2
S
1
＞
S
2
230
LD
＞＝
D LD
＞＝
S
1
≧
S
2
S
1
＜
S
2
3. If a 32-bit counter is used with this instruction for comparison, be sure to use the 32-bit
instruction (DLD*). If the 16-bit instruction (LD*) is used with a 32-bit counter, a “Program
Error”, will occur and the red “ERROR” indicator on the ELC panel will blink.
Program Example:
1. If the accumulated value of counter C10 is equal to K200, Y20=ON.
2. When the content of D200 is less than or equal to K
–
30, and X1=ON, set Y21=ON.
LD=
K200 C10
Y20
LD<=
D200 K-30
X1
SET Y21