Omron CS1W-NC113 Manual page 324

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 PC 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 PC cycle time of 2 ms, are shown in the
tables below.
Data Reading Time
Amount of
data to be data to be
IORD
read
0.7 ms
3 words
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 data to be
IOWR
written
0.7 ms
3 words
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
NC1j3
READ DATA
0.7 ms
13 ms
13 ms
15 ms
---
45 ms ---
100 ms ---
NC1j3
WRITE DATA IOWR
0.7 ms
13 ms
13 ms
15 ms
---
50 ms ---
115 ms ---
NC2j3
IORD READ DATA
13 ms
13 ms
15 ms
---
50 ms
105 ms
NC2j3
WRITE DATA
13 ms
13 ms
15 ms
---
50 ms
125 ms
Data transfer time
Appendix A
NC4j3
IORD READ DATA
0.6 ms
13 ms
13 ms
15 ms
---
--- 45 ms
--- 100 ms
NC4j3
IOWR WRITE DATA
0.6 ms
13 ms
13 ms
15 ms
---
--- 50 ms
--- 120 ms
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