Delta VP3000 Series - Page 384

Chapter 7 Second Development PlatformVP3000
375
API Instruction code Operand Function
224–230 D
LD※
S
1
, S
2
Contact type comparison LD※
Type
Operand
Bit devices Word devices
16-bit instruction (5 steps)
LD※
Continuous
execution
type
- -
32-bit instruction (9 steps)
DLD※
C
ontinuous
execution
type
- -
Associated flag: none
X Y M K H KnX KnY KnM T C D
S
1
       
S
2
       
Caution for using operand ※: =, >, <, <>, ≦, ≧
 See the specification of each model for the scope of device’s usage.
Description
 S
1
: source device 1
S
2
: source device 2
 This instruction is to compare S
1
and S
2
, take API 224 (LD=) as an example, if the result is
“equal to”, the continuity of the instruction is enabled; if the result is “not equal to”, the
continuity of the instruction is disabled.
 LD※ (※: =, >, <, <>, ≦, ≧) instruction is used for direct connection with busbar
API No. 16-bit instruction 32-bit instruction
Continuity
condition
Discontinuity
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
 When C10 = K200, Y10 = ON.
 When D200 > K-30 and X1 = ON, Y11 = ON and hold.
LD=
K200 C10
DLD>
K678493 C20
M3
Y10
LD>
D200 K-30
SET Y11
M50
X1