Mitsubishi Electric MELSEC-Q/L - Reading Newest Data from Data Tables

502
7 APPLICATION INSTRUCTIONS
7.7 Data Table Operation Instructions
Reading newest data from data tables
FPOP(P)
Processing details
• Stores the newest data input to the table designated by (D) at the device designated by (S). After the execution of the
FPOP instruction, the device storing the data read by the FPOP instruction is reset to 0.
• Perform interlock to avoid executing the FPOP instruction when the value stored at (D) is 0.
Operation error
• In any of the following cases, an operation error occurs, the error flag (SM0) turns on, and an error code is stored in SD0.
(S): Head number of the devices where the data read from the table will be stored (BIN 16 bits)
(D): Head number of the table (BIN 16 bits)
Setting
data
Internal device R, ZR J\ U\G Zn Constant Others
Bit Word Bit Word
(S)   
(D)   
Error
code
Error details Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU
4100 The FPOP instruction was executed when the value of (D) was 0. 
4101 The data table range exceeded the range of the corresponding device at the
execution of the FPOP instruction.

Basic
Process
High
performance
Redundant Universal LCPU
Command
Command
FPOPP
FPOP
S
S
FPOP
FPOPP
D
D
+1
+2
Data table
Number of stored
data blocks
1234
5432
7
-1000
0
+7
-4321
+1
+2
Data table
1234
5432
6
-1000
0
+7
0
-4321
Stores 0.
D
D
D
D
D
D
D
D
S