Delta DVP-ES2 - Manual (Page 216)

D V P - E S 2 / E X 2 / S S 2 / S A2 / S X 2 / S E O p e r a t i o n M a n u a l - P r o g r a m m i n g
3 - 1 0 0
API Mnemonic Operands Function
38 SFWR P Shift Register Write
Controllers
ES2/EX2 SS2
SA2
SE
SX2
Bit Devices Word devices Program Steps Type
OP X Y M S K H KnX KnY KnM KnS T C D E F
S * * * * * * * * * * *
D * * * * * *
n * *
SFWR, SFWRP: 7 steps
PULSE 16-bit 32-bit
ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2
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
RST D0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D20
X0
SFWRP D20 K10 D0
Reset the content of D0 to 0 (zero) previously
Pointer
n = 10 points
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.