Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual KnX KnY KnM KnS SFWR, Sfwrp 7 steps

DVP - ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

API

38

Mnemonic Operands Function Controllers

SFWR	P	Shift Register Write	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

SFWR, SFWRP: 7 steps

S

*

*

*

*

*

*

*

*

*

*

*

D

*

*

*

*

*

*

n

*

*

PULSE

16-bit

32-bit

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

SE

SE

SE

Operands:

S: Source device D: Head address of data stack

n: Length of data stack

Explanations:

1.This instruction defines the data stack of n words starting from D as a “first-in, first out (FIFO)” data stack and specifies the first device as the pointer (D). When SFWRP is executed, content in pointer pluses 1, and the content in S will be written into the device designated by the pointer. When the content in pointer exceeds n-1, the instruction stops and carry flag M1022= ON.

2.This instruction is generally used in pulse execution mode (SFWRP).

3.Valid range of operand n: 2≤ n ≤512

Program Example:

1.First, reset the content of D0. When X0 goes from OFF to ON, the content of D0 (pointer) becomes 1, and D20 is written into D1. If the content of D20 is changed and X0 is triggered again, pointer D0 becomes 2, and the content of D20 is then written into D2.

2.P The figure below illustrates the shift and writing process of the instruction. n The content of D0 becomes 1.

o. The content of D20 is written into D1.

X20

X0

D20

RST			D0	Reset the content of D0 to 0 (zero) previously
SFWRP		D20		D0			K10
					n = 10 points
D9	D8		D7	D6		D5	D4	D3	D2	D1	D0
											Pointer

D0 = 3 2 1

Points to note:

This instruction can be used together with API 39 SFRD for the reading/writing of “first-in, first-out” stack data.

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