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Cycle Time Section 7-3
7-3-4 One-to-one Link I/O Response Time
When two CQM1Hs are linked one-to-one, the I/O response time is the time
required for an input executed at one of the CQM1Hs to be output to the other
CQM1H by means of one-to-one link communications.
One-to-one link communications are carried out reciprocally between the
master and the slave. The respective transmission times are as shown below,
depending on the number of LR words used.
The minimum and maximum I/O response times are shown here, using as an
example the following instructions executed at the master and the slave. In
this example, communications proceed from the master to the slave.
The following conditions are taken as examples for calculating the I/O
response times.
Input ON delay: 8 ms
Master cycle time: 10 ms
Slave cycle time: 15 ms
Output ON delay: 10 ms
Direct output: Not used.
Number of LR words: 64
Note The input ON delay for DC Input Units can be set in the PC Setup.
Minimum I/O Response
Time
The CQM1H responds most quickly under the following circumstances:
1,2,3... 1. The CQM1H receives an input signal just prior to the input refresh phase
of the cycle.
2. The master to slave transmission begins immediately.
3. The slave executes communications servicing immediately after comple-
tion of communications.
Number of words used Transmission time
64 words (LR 00 to LR 63) 39 ms
32 words (LR 00 to LR 31) 20 ms
16 words (LR 00 to LR 15) 10 ms
Input
Output (LR) Input
(LR)
Output
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