7 APPLICATION INSTRUCTION
7.5 Data table operation instruction
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7
7.5 Data table operation instruction
Reading the oldest data from the data table
SFRD(P)
These instructions read data for first-in first-out control.
■Descriptions, ranges, and data types
■Applicable devices
Ladder diagram Structured text
ENO:=SFRD(EN,s,n,d);
ENO:=SFRDP(EN,s,n,d);
Operand Description Range Data type Data type (label)
(s) Start number of the word device storing the data
(The start is a pointer. The data is stored starting from (s)+1.)
16-bit signed binary ANY16
(d) Word device number storing data taken out first 16-bit signed binary ANY16
(n) Number of stored points plus "1". "+1" is required for the pointer. 2 to 32768 16-bit signed binary ANY16
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB
U\G T, ST,
C, LC
T, ST, C, D,
W, SD, SW, R
U\G Z LC LZ K, H E $
(s)
(d)
(n)
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