Omron CS1W-NC113 Manual page 128

Writing Data with IOWR
116
two possible methods with which this data is written to the respective data area
within the PCU. The method that is used will be determined automatically; it
does not have to be specified in the ladder program.
Method Outline
Method 1 The transferred data is
immediately written to
the data area.
Method 2 The data is written to the
data area only after it
has all been received in
a receive buffer.
Section
Characteristics
The data specified with the IOWR
instruction is written to the data area within
one cycle. The number of items (words) that
can be transferred with one IOWR
instruction is limited as follows:
Data:
Positioning sequences: 1 (3 words)
Speeds: 6 (12 words)
Positions: 6 (12 words)
Acceleration times: 12 (12 words)
Deceleration times: 12 (12 words)
Dwell times: 12 (12 words)
Zone data: 3 (12 words)
Parameters:
Acceleration times: 1 (2 words)
Deceleration times: 1 (2 words)
Origin compensation data: 1 (2 words)
Other data: 1 (1 word)
When changing position data and executing
memory operation, it is possible to transfer
the data to the PCU and send the
instruction to start operation within one
cycle.
Up to 128 words of data can be transferred
in one operation. If the number of words to
be transferred is greater than the limits for
method 1 listed above, method 2 will be
used automatically.
With this method, because data is written to
the data area only after it has all been
received in the receive buffer, if the IOWR
instruction is used more than once in the
ladder program, it may take 2 or more
cycles for transfer to be completed. (See
the following example.) This is different from
method 1, where data transfer is completed
within one cycle.
If the IOWR instruction is used only once in
the ladder program, it is possible to transfer
the data to the PCU and send the
instruction to start operation within one
cycle, in the same way as method 1.
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