Omron CJ1W-C113 - REV 02-2008 Operation Manual page 376

Performance Characteristics
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
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
Amount of
data to be read
IORD
3 words 0.7 ms
15 words
30 words
126 words
300 words ---
772 words (See ---
note.)
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
Amount of
data to be writ-
IOWR
ten
3 words 0.7 ms
15 words
30 words
126 words
300 words ---
772 words (See ---
note.)
Note The time for 772 words is the time to write all the data for one axis from the positioning sequences to
zone data.
WRITE DATA/READ DATA Bit
or IORD/IOWR execution bit
Data Transferring Flag
= Flag
+ Number of words to be transferred (words) ÷ 20 (words) × Cycle time
NC1@3
READ DATA
13 ms 0.7 ms
13 ms
15 ms
---
45 ms ---
100 ms ---
NC1@3
WRITE DATA
13 ms 0.7 ms
13 ms
15 ms
---
50 ms ---
115 ms ---
NC2@3
IORD READ DATA
13 ms
13 ms
15 ms
---
50 ms
105 ms
NC2@3
IOWR WRITE DATA
13 ms
13 ms
15 ms
---
50 ms
125 ms
Data transfer time
Appendix A
NC4@3
IORD READ DATA
0.6 ms 13 ms
13 ms
15 ms
---
--- 45 ms
--- 100 ms
NC4@3
IOWR WRITE DATA
0.6 ms 13 ms
13 ms
15 ms
---
--- 50 ms
--- 120 ms
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