Omron CS1W-MC221 -, Operation Manual

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IOWR and IORD Specifications Section 4-2
4-2-3 Transferring Data Using the Command Area
Refer to the following diagram for the execution timing and processing method
of the IOWR instruction when the command area is used for large amounts of
data.
Note Addresses in parentheses are for the CS1W-MC221 on the left side of the
slash and are for the CS1W-MC421 on the right side of the slash.
1,2,3... 1. The CPU Unit performs a format check to see if the designations for the
IOWR instruction operands are correct. The Error Flag will be turned ON
and the IOWR instruction will not be executed if a designation is in correct.
2. The MC Unit performs a data check to see if the MC Unit can process the
data designated with the operand. The Equals Flag will be turned ON if the
MC Unit can process the data. The Equals Flag will not be turned ON and
the IOWR instruction will not be executed if the MC Unit cannot process
the data.
Note If a command (e.g., for program execution) is given while data is being pro-
cessed in step 2 above, the command will be executed after the data is pro-
cessed.
Example: Program
Execution after Position
Data Transfer The timing chart shows data for task 1.
1,2,3... 1. Position data is transmitted with the IOWR instruction.
2. The Equals Flag will be turned ON when the transmission of the position
data has been completed.
3. The Data Writing Flag will turn OFF when data processing has been com-
pleted.
Data writing
(n + 10, 06/n + 18, 06)
Data write error
(n+10, 07/n+18, 07)
Data reading
(n+10, 08/n+18, 08)
ON for one cycle min.
ON for one cycle min.
Error
Error
Data read error
(n+10, 09/n+18, 09)
Transfer data
IOWR instruction
Fixed
Bits for writing
Bits for reading
Format
check
Data check
Data processing
Within one cycle
The completion time varies with the data to
be transferred and the number of words.
(1)
(2)
(3)