636
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
27 Data Operation 3 – FNC210 to FNC219
27.3 FNC212 – POP / Shift Last Data Read [LIFO Control]
27.3
FNC212 – POP / Shift Last Data Read [LIFO Control]
Outline
This instruction reads the last data written by shift write (SFWR) instruction for last-in first-out control.
→
For SFWR (FNC 38) instruction, refer to Section 11.9.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (POP and POPP)
Data for first-in last-out controll
• Every time the instruction is executed for the word devices
to
+n-1, a device “
+ Pointer
data
” is read to
. (The last data written by the shift write (SFWR) instruction for first-in first-out
control is read to
.) Specify “n” in the range from “2” to “512”.
Operand Type
Description
Data Type
Head device number storing first-in data (including pointer data)
(Head word device number storing data)
16-bit binary
Device number storing last-out data
n
Number of stored data
(Add "1" because pointer data is also included.)
2 <= n <= 512
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS
T
C
D
R U
\G
V
Z Modify K
H
E
"
"
P
3
3
3
3 3 3 3
3
3
3
3
3
3 3 3 3
3
3 3
3
n
3 3
Description
Pointer data (number of stored data)
+1
Data area
(First-in data written by shift write (SFWR) instruction)
+2
+3
..
.
+n-3
+n-2
+n-1
Mnemonic
Operation Condition
16-bit Instruction
7 steps
POP
POPP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
⎯
⎯
P
FNC 212
POP
S
D
S
D
FNC212
POPP
S
D
n
Command
input
S
S
S
S
S
S
S
S
S
S
S
D
D