15 NETWORK COMMON INSTRUCTIONS
1453
15
Calculating the value to be set for the arrival monitoring time
The following shows the method for determining the value to be set for the arrival monitoring time specified by link dedicated
instructions.
■
Outline of communication processing for link dedicated instructions
When a link dedicated instruction is executed in the same network, the communication process at occurrence of
retransmission is as follows.
Ex.
The READ instruction is executed in the same network.
■
Calculating the arrival monitoring time
The value to be set for the arrival monitoring time must be greater than the time taken from
to
.
[Calculation formula]
Arrival monitoring time>Tcpu+Tnet
The CPU module executes the instruction and the network module accepts the instruction.
The own station network module sends the request to another station.
Another station network module receives the request and relays it to the CPU module.
The CPU module processes the request.
Another station network module relays the response from the CPU module.
Another station network module sends the response to the own station.
The own station network module receives the response and processes it.
The own station network module requests retransmission if the response does not arrive within the arrival monitoring time.
Item
Description
Details
Tc_req
Communication time (request)
In the case of the CC-Link IE Controller Network or CC-Link IE Field Network, calculate
based on the link scan time.
For concurrent multiple transmissions including other transient transmissions, further
increase the time in units of link scans.
The link scan time can be checked with the diagnostic window of each network.
When Ethernet is used, the time varies depending on the amount of data and network
load ratio (line congestion).
Calculate the time by adding the delay of the switching hub and the line congestion to
1ms.
Tc_ans
Communication time (response)
Tt_req
Network module relay time (request)
Set 20ms in total.
Tt_ans
Network module relay time (response)
Tnet
Network module instruction processing time
(response)
Tcpu
CPU module response time
This time varies depending on the CPU module type and operating status.
Calculate the response time by "sequence scan time"
"number of times the device/
label access service is performed per scan".
For the scan time and device/label access service processing, refer to the following.
MELSEC iQ-R CPU Module User's Manual (Application)
Ò
Ó
Ô
Õ
Ö
×
Ø
Ù
(Own station)
(Another station)
CPU
module
CPU
module
Execution of the
READ instruction
Completion of the
instruction
Arrival
monitoring
time
Instruction
accepted
Sending a request
Requesting
Time
Instruction processing time (request)
Communication time (request)
Transfer time (request)
Instruction processing time (response)
Communication time (response)
Transfer time (response)
Response time of the CPU module
Requesting
(retry)
Responding
Processing
performed
Receiving a response
Network
module
Network
module
Request accepted
Processing performed
Содержание MELSEC iQ-R Series
Страница 1: ...MELSEC iQ R Programming Manual Instructions Standard Functions Function Blocks ...
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Страница 24: ...22 INDEX 2092 INSTRUCTION INDEX 2093 REVISIONS 2104 WARRANTY 2105 TRADEMARKS 2106 ...
Страница 34: ...32 MEMO ...
Страница 35: ...33 PART 1 PART 1 OVERVIEW This part consists of the following chapter 1 OVERVIEW ...
Страница 68: ...66 1 OVERVIEW 1 5 Precautions on Programming MEMO ...
Страница 204: ...202 5 SEQUENCE INSTRUCTIONS 5 3 Output Instructions Operation error There is no operation error ...
Страница 470: ...468 6 BASIC INSTRUCTIONS 6 6 Data Conversion Instructions Operation error There is no operation error ...
Страница 472: ...470 6 BASIC INSTRUCTIONS 6 6 Data Conversion Instructions Operation error There is no operation error ...
Страница 479: ...6 BASIC INSTRUCTIONS 6 6 Data Conversion Instructions 477 6 Operation error There is no operation error ...
Страница 504: ...502 6 BASIC INSTRUCTIONS 6 7 Data Transfer Instructions Operation error There is no operation error ...
Страница 518: ...516 6 BASIC INSTRUCTIONS 6 7 Data Transfer Instructions Operation error There is no operation error ...
Страница 520: ...518 6 BASIC INSTRUCTIONS 6 7 Data Transfer Instructions Operation error There is no operation error ...
Страница 754: ...752 7 APPLICATION INSTRUCTIONS 7 9 Real Number Instructions Operation error There is no operation error ...
Страница 756: ...754 7 APPLICATION INSTRUCTIONS 7 9 Real Number Instructions Operation error There is no operation error ...
Страница 758: ...756 7 APPLICATION INSTRUCTIONS 7 9 Real Number Instructions Operation error There is no operation error ...
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Страница 895: ...7 APPLICATION INSTRUCTIONS 7 16 Ramp Signal Instruction 893 7 Operation error There is no operation error ...
Страница 917: ...7 APPLICATION INSTRUCTIONS 7 20 Data Processing Instructions 915 7 Operation error There is no operation error ...
Страница 919: ...7 APPLICATION INSTRUCTIONS 7 20 Data Processing Instructions 917 7 Operation error There is no operation error ...
Страница 1415: ...13 SFC PROGRAM INSTRUCTIONS 13 1 SFC Control Instructions 1413 13 Operation error There is no operation error ...
Страница 1448: ...1446 14 REDUNDANT SYSTEM INSTRUCTIONS 14 2 Disabling Enabling System Switching MEMO ...
Страница 1795: ...25 TYPE CONVERSION FUNCTIONS 25 1 Converting BOOL to WORD 1793 25 Operation error There is no operation error ...
Страница 1805: ...25 TYPE CONVERSION FUNCTIONS 25 10 Converting WORD to DINT 1803 25 Operation error There is no operation error ...
Страница 1819: ...25 TYPE CONVERSION FUNCTIONS 25 21 Converting INT to DWORD 1817 25 Operation error There is no operation error ...
Страница 1950: ...1948 32 STRING FUNCTIONS 32 2 Extracting String Data From the Left Right Operation error There is no operation error ...
Страница 1972: ...1970 33 TIME DATA TYPE FUNCTIONS 33 4 Division MEMO ...
Страница 2067: ...APPX Appendix 5 PID Control Program Examples 2065 A 252 Set PID control data for loop 2 ...
Страница 2082: ...2080 APPX Appendix 6 Process Control Program Examples 129 Set the default value of the loop tag ...
Страница 2093: ...APPX Appendix 7 List of Loop Tag Memory Areas Used by Process Control Instructions 2091 A MEMO ...
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