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12-27
12 Communications Performance and Communications Load
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
12-4 Me
ssa
g
e Ser
vice T
ransm
ission
Dela
y
12
12-4 Message Service Transmission Delay
This section describes the delay time that occurs in CIP communications instruction (CIPWrite) service
processing.
Processes that cause a delay time are processed in the task periods at each node as shown in the
above diagram. Line-based delays are as follows:
Transmission Delay
The transmission delay on an Ethernet line is 50
μ
s or less. This delay time can be ignored.
Additional Information
•
Depending on the actual operating environment, the transmission time may be longer than the
one calculated with the equations given here. The following factors can cause longer transmis-
sion times: other traffic on the network, window sizes of network nodes, other traffic at the Eth-
erNet/IP Unit itself (e.g., simultaneous tag data link communications), and the system
configuration.
•
CIP communications processing is executed as a system service. If a timeout occurs for a CIP
communications instruction, reconsider the execution time for system services.
OI UPG M C
IO UPG M C
IO UPG M C
IO UPG M C
System
service
System
service
System
service
System
service
Line
Line
Command generated.
Received command interpreted.
Response generated.
Variable written.
Received response interpreted.
Instruction (CIPWrite) executed.
Instruction completed.
OI UPG M C
OI UPG M C
×
×
Controller#1
Controller#2
Transmission path
Transmission
delay
Receive
delay
System
service
Receive
delay
System
service
Variable
written.
System
service
System
service
Transmission
delay
Transmission
delay
Task period
(local node)
Task period
(remote node)
Task period
(local node)
Task period
(remote node)
Line
Line
Maximum transmission delay time = Send delay + System service execution time + Transmission delay + Receive delay + System service execution time
+ Variable write time + System service execution time + Transmission delay + Receive delay + System service execution time
(Local node task period)
(Local node task period)
(Remote node task period)
(Remote node task period)
Содержание SYSMAC CJ1W-EIP21
Страница 8: ...Manual Structure 6 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 10: ...Sections in this Manual 8 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 20: ...Read and Understand this Manual 18 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 42: ...Revision History 40 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 68: ...1 Introduction 1 26 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 80: ...2 Installing Ethernet Networks 2 12 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 130: ...6 Testing Communications 6 4 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 206: ...7 Tag Data Link Functions 7 76 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 246: ...8 Message Communications 8 40 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 266: ...9 FTP Server 9 20 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 374: ...13 Troubleshooting 13 56 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 431: ...Index 1 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495 I Index...
Страница 436: ...Index 6 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495 Index...
Страница 437: ......