Fuji Electric micrex-sx NP1F-MP1, Руководство пользователя

Страница: 209 / 250

7-27
7-3 Functions of Pulse Generation Mode
• “Command pulse zero” signal becomes “1” when the FIFO buffer is completely empty and the command pulse
register is “0.”
When effective data remains in the FIFO buffer, positioning is started at the rising edge of the start signal.
While the start command is “1,” if positioning data exists in the FIFO buffer, positioning is executed.
That is to say, while the start signal is “1,” if the FIFO buffer is completely empty, positioning is started the moment
the command pulse count data is written.
Command pulse count
FIFO buffer data
Start command
(PC == > MP1/MP2)
Data write command
(PC == > MP1/MP2)
Response to data write command
(PC <== MP1/MP2)
Positioning end
(PC <== MP1/MP2)
Command pulse zero
(PC <== MP1/MP2)
Frequency
Time
“1”
“1”
“1”
“1”
“1”
• While the start command is “1,” the positioning end signal becomes “0.”
Therefore, the command pulse zero signal and near-zero signal are used to detect the completion of operation.
• When the start command is “0,” the data written in the FIFO buffer are stored as unexecuted data in order.
When the buffer full signal is “1,” even if the command pulse count data is written, the written data will be skipped.
(Target frequency data can be written.)
Precautions:
• To start the operation using FIFO buffer data, follow the procedure described below:
1) Reset the command pulse register when is stopped.
2) Write the data in the FIFO buffer.
3) Turn the start command ON.
• In writing data in the FIFO buffer, if pulses remain in the command pulse register, the number of pulses which
remain in the command pulse register are added to the total number of pulses of the FIFO buffer. (Refer to the
command pulse register.)
Even if pulses remain in the command pulse register, operation is performed at the speed which is set in the FIFO
buffer when started by the FIFO buffer. (However, for constant speed motion, speed change-over point may differ
from the expected point.)