Message Delay Times; Cs/Cj-Series, Cvm1, And Cv-Series Plcs - Omron C200HW-CLK21 Operation Manual

Message Delay Times

8-4 Message Delay Times
8-4-1

CS/CJ-series, CVM1, and CV-series PLCs

SEND
In this case, the data processing time required for data exchange and the data
transmission time are not negligible and need to be included in the calcula-
tion. Each time can be determined as follows.
Data Processing Time (see page 254.)
0.0025 (8 + 16) 8 + 4.7 = 5.18
Data Transmission Time
Data transmission time varies with the baud rate.
Baud rate
2 Mbps Number of data link words
1 Mbps Number of data link words
500 Kbps Number of data link words
In this example, the number of data link words is (8 + 16)
data transmission time can be determined as follows:
0.008 (8 + 16) 8 = 1.536
Assume that the sum of the instruction execution time and I/O refresh time for
the PLCs at nodes #1 and #7 is 1 ms. The equation for minimum data link I/O
response time is as follows:
Input ON delay
Instruction execution time + I/O refresh
time for PLC at node #1
Data processing time
Data link transmission time
Data processing time
Instruction execution time + I/O refresh
time for PLC at node #7
Output ON delay
Total (data link I/O response time)
Noise may increase I/O delays.
The two charts which follow indicate the sequence of processing which will
enable users to calculate the maximum delay time to be expected between
the time SEND(192) or RECV(193) is executed and the time the data is stored
in the destination or source node's memory area, ready for use by other
instructions in the program.
The following diagram indicates the data flow which will yield the maximum
delay time from the time SEND(192)/SEND(90) is executed by the user pro-
gram to the time the Controller Link Unit stores the data in the destination
Unit's memory.
5.2 ms
Data transmission time
0.008 ms
0.016 ms
0.032 ms
1.5 ms
---
1 ms
5.2 ms
1.5 ms
5.2 ms
1 ms
---
13.9 ms
Section 8-4
8 = 192, so the
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