Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 584)

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