Omron CJ1W-C113 - REV 02-2008, Operation Manual

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Performance Characteristics Appendix A
Data Transfer and Data Saving Time
When data is transferred using either the READ DATA or WRITE DATA commands (word n+1, bits 12 and 13),
the execution time will vary depending on the number of words of data to be transferred and the PLC cycle
time. When using these commands, up to 20 words of data can be sent for each cycle of the ladder program.
Consequently, the data transfer execution time is giving by the following:
Data transfer execution time = Data transfer preparation time at the PCU
+ Number of words to be transferred (words)
÷
20 (words)
×
Cycle time
When data is transferred using either the IORD and IOWR instructions, the execution time will hardly be
affected by the number of words of data to be transferred, and will not be affected at all by the cycle time. The
maximum data transfer execution times for transferring positioning sequences, with a PLC cycle time of 2 ms,
are shown in the tables below.
Data Reading Time
Note The time for 772 words is the time to read all the data for one axis from the positioning sequences to
zone data.
Data Writing Time
Note The time for 772 words is the time to write all the data for one axis from the positioning sequences to
zone data.
Amount of
data to be read
NC1
@
3 NC2
@
3 NC4
@
3
IORD READ DATA IORD READ DATA IORD READ DATA
3 words 0.7 ms 13 ms 0.7 ms 13 ms 0.6 ms 13 ms
15 words 13 ms 13 ms 13 ms
30 words 15 ms 15 ms 15 ms
126 words --- --- ---
300 words --- 45 ms --- 50 ms --- 45 ms
772 words (See
note.) --- 100 ms --- 105 ms --- 100 ms
Amount of
data to be writ-
ten
NC1 @ 3 NC2 @ 3 NC4 @ 3
IOWR WRITE DATA IOWR WRITE DATA IOWR WRITE DATA
3 words 0.7 ms 13 ms 0.7 ms 13 ms 0.6 ms 13 ms
15 words 13 ms 13 ms 13 ms
30 words 15 ms 15 ms 15 ms
126 words --- --- ---
300 words --- 50 ms --- 50 ms --- 50 ms
772 words (See
note.) --- 115 ms --- 125 ms --- 120 ms
WRITE DATA/READ DATA Bit
or IORD/IOWR execution bit
Data Transferring Flag
= Flag
Data transfer time