Lifr (Data Read (Last-In-First-Out)) - Panasonic FP7 Series Command Reference Manual

8.20 LIFR (Data Read (Last-In-First-Out))

8.20 LIFR (Data Read (Last-In-First-Out))

■
Ladder diagram
■
Available operation units (●: Available)
Operatio
bit
n unit
i
■
List of operands
Operand Description
S Starting device address of the data buffer
D Device address of the read data
■
Available devices (●: Available)
Operan
d
W W
X Y
S
D ● ●
(Note 1) Only 16-bit devices and integer constants can be modified.
(Note 2) Index register (I0 to IE)
■
Outline of operation
● This instruction reads data from LIFO buffer specified by [S], and sets it to [D].
(In the [S] buffer area, it is necessary to define buffer first using the DEFBUF instruction.)
● Pre-execution buffer consistency check (An operation error occurs in the following cases)
1. [S] (buffer size) > 4096, or [S] (buffer size) = 0
2. [S]+1 (stored data amount) = 0
3. [S]+2 ≠ 0
4. [S]+1 (stored data amount) > [S] (buffer size)
5. [S]+3 (LIFO pointer) ≥ [S] (buffer size)
6. Buffer area exceeds the upper limit of the specified device
8-42
US
●
16-Bit device:
W W W S D L
R L S D T D
● ●
● ● ● ●
SS UL
●
32-Bit
device:
TS TE
U W
WI
C C
M O
S E
● ●
SL SF
Real
Integer numbe
r
IX
(N
K Ｕ H SF
ote
2)
WUME-FP7CPUPGR-12
DF
St
rin
g
Index
modifie
r
D
(Note 1)
" "
F
●
●