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Message Delay Times
Section 8-4
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:
Noise may increase I/O delays.
8-4
Message Delay Times
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.
8-4-1
CS/CJ-series, CVM1, and CV-series PLCs
SEND
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.
Note
Be sure to take into account the time required for data links and program exe-
cution, which are not included in the following example.
Input ON delay
---
Instruction execution time + I/O refresh
time for PLC at node #1
1 ms
Data processing time
5.2 ms
Data link transmission time
1.5 ms
Data processing time
5.2 ms
Instruction execution time + I/O refresh
time for PLC at node #7
1 ms
Output ON delay
---
Total (data link I/O response time)
13.9 ms
SEND(192)/SEND(90)
executed
Link Unit servicing (source node)
Transmission processing
Communications cycle
Data stored
Reception processing
Max. transmission delay
Link Service processing (source node)
Link Service processing
(destination node)
Transmission delay
Link Service
processing
(source node)
Summary of Contents for C200HW-CLK21
Page 3: ...iv ...
Page 9: ...x ...
Page 12: ...xiii TABLE OF CONTENTS Index 367 Revision History 373 ...
Page 13: ...xiv ...
Page 19: ...xx ...
Page 57: ...32 Application Precautions Section 1 5 Example CX Programmer Response Timeout Setting ...
Page 69: ...44 Message Service Procedure Section 2 2 ...
Page 111: ...86 Constructing Networks with Repeater Units Section 3 4 ...
Page 154: ...129 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 261: ...236 Response Codes Section 6 7 ...
Page 297: ...272 Message Delay Times Section 8 4 ...
Page 353: ...328 Handling Precautions Section 9 6 ...
Page 364: ...339 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 365: ...340 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 369: ...344 Standard Models Appendix A ...
Page 391: ...366 Using the Relay Terminal Block Appendix C ...
Page 397: ...372 Index ...
Page 401: ...376 Revision History ...