Appendix A
Performance Characteristics
315
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
+ 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 PC cycle time of 2 ms, are shown in the
tables below.
Data Reading Time
Amount of
data to be
NC1
j
3
NC2
j
3
NC4
j
3
data to be
read
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
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
NC1
j
3
NC2
j
3
NC4
j
3
data to be
written
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
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
Data transfer time
Summary of Contents for CS1W-NC113 - REV 02-2008
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