Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Ld※, Contact Type Comparison

3. Instruction Set

API

224~

230

Mnemonic		Operands	Function
D	LD※		Contact Type Comparison

Controllers

ES2/EX2 SS2 SA2 SX2

SE

Type

Bit Devices

Word devices

Program Steps

OP

X

Y

M

S

K

H KnX KnY KnM KnS T

C D E

F

LD※: 5 steps

S1

*

*

*

*

*

*

*

*

*

*

*

DLD※: 9 steps

S2

*

*

*

*

*

*

*

*

*

*

*

PULSE

16-bit

32-bit

ES2/EX2	SS2	SA2	SX2	ES2/EX2	SS2	SA2	SX2	ES2/EX2	SS2	SA2	SX2
		SE				SE				SE

Operands:

S1: Source device 1 S2: Source device 2

Explanations:

1.This instruction compares the content in S1 and S2. 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.

2.LD※ (※: =, >, <, <>, ≤, ≥) instruction is used for direct connection with left hand bus bar.

API No.	16 -bit	32 -bit	Continuity	Discontinuity
	instruction	instruction	condition	condition
224	LD＝	DLD＝	S1＝S2	S1≠S2
225	LD＞	DLD＞	S1＞S2	S1≦S2
226	LD＜	DLD＜	S1＜S2	S1≧S2
228	LD＜＞	DLD＜＞	S1≠S2	S1＝S2
229	LD＜＝	DLD＜＝	S1≦S2	S1＞S2
230	LD＞＝	DLD＞＝	S1≧S2	S1＜S2

3.When the MSB (16-bit instruction: b15, 32-bit instruction: b31) of S1 and S2 is 1, the comparison value will be viewed as a negative value in comparison.

4.When 32-bit counters (C200 ~ C254) are used in this instruction, make sure to adopt 32-bit instruction (DLD※). If 16-bit instruction (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, Y20 = ON.

2.When the content in D200 > K-30 and X1 = ON, Y21 = ON and latched.

LD= K200 C10 Y20

X1

LD<= D200 K-30

SET Y21

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