10 Application Instructions API 200-249
DVP-PLC Application Manual
10-10
API Mnemonic
Operands
Function
224~
230
D
LD
※
LoaD Compare
Controllers
ES/EX/SS SA/SX/SC EH/SV
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
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S
1
: Data source device 1
S
2
: Data source device 2
Explanations:
1. See the specifications of each model for the range of operands.
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
=
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
4. When 32-bit counters (C200 ~ C255) are used in this instruction for comparison, make sure to adopt 32-bit
instruction (DLD
※
). If 16-bit instructions (LD
※
) is adopted, a “program error” will occur and the ERROR
indicator on the MPU panel will flash.
Program 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.
3. When the content in C200 < K678,493 or M3 = On, M50 = On.
LD=
K200
C10
DLD> K678493 C200
M3
Y10
LD>
D200
K-30
X1
SET
Y11
M50
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