Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 297)

5.10 System Function Instructions
5.10.2 First-in First-out (FINFOUT)
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5.10.2 First-in First-out (FINFOUT)
( 1 ) Operation
The FINFOUT instruction calls a first-in first-out block data transfer function. The FIFO data table consists of a 4-
word header and a data buffer. Always set the three words with the data size, input size, and output size before you exe-
cute this instruction.
• When the Data Input Command (In-Cmd) turns ON, the specified number of data items from the specified input
data area are stored sequentially in the data area of the FIFO table.
• When the Data Output Command (Out-Cmd) turns ON, the specified number of data items are moved from the
first address in the data area of the FIFO table to the specified output data area.
• When the Reset Command (Reset) turns ON, the number of stored words is set to 0 and Tbl-Emp (FIFO table
empty) turns ON.
• If the data empty size is less than the input size or if the data size is less than the output size, Tbl-Err (FIFO table
error) turns ON.
[ a ] If the Data Input Command (In-Cmd) Is ON
[ b ] If the Data Option Command (Out-Cmd) Is ON
[ c ] If the Reset Command (Reset) Is ON
The number of words stored in the FIFO table is set to 0.
ΠThe contents of the table buffer are retained and not cleared to 0.
1
FIFO table data buffer
Start 2 3
1
…
Data size (words)
2
3
First address of input data
Input size
(words)
Data In-Cmd = ON
1
FIFO table data buffer
Start
2 3 4
1
…
2
3
First address of output data
Output size
(words)
Data Out-Cmd = ON
4
After the output is completed, this data is moved to the first address.