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134
Data Link I/O Response Time
Section 8-3
Note
1. Noise may increase I/O delays.
2. The data send processing time for the area marked by the asterisk (*) in
the diagram will be affected by the processing capacity of the computer
that is used.
3. The communications cycle time may fluctuate.
4. For details regarding the time required for data exchanges between the
Controller Link Unit and the PC, refer to the
Controller Link Units Operation
Manual
(W309 or W370).
8-3-2
PC to Computer
In the following diagram illustrating the maximum data link I/O response time,
a CS-series PC is used for the PC (#2) and the PC’s cycle time is greater than
or equal to the communications cycle time.
There are three points shown in the diagram above where processing is
delayed, increasing the data link I/O response time.
1,2,3...
1. The input arrives in the PC just after I/O refreshing, causing a delay of up
to one cycle before the input is read into the PC.
2. Data exchange occurs just after the PC at node #2 passes the token that
makes it the polling node, causing a delay of up to one communications
cycle time before the data is transferred in data link processing.
3. The data arrives at the Data Link Area of the Support Board mounted at
the computer at node #1, but processing is delayed until the user applica-
tion executes the ClkReadDatalink library function. This delay will vary de-
pending on the contents of the user application.
Note
1. Noise may increase I/O delays.
User application
PC at node #2
(ClkReadDatalink)
Late
1 cycle
Program
Communications
cycle time
1
2
3
Input de
v
ice
Data link I/O response time
Input
I/O refresh
Data exchange
(*)
Data link
transmissions
Late
Computer at node #1
Input O
N
response time
Recei
v
e processing
(FinsGateway)
Summary of Contents for SYSMAC 3G8F7-CLK12-EV1
Page 2: ......
Page 4: ...iv ...
Page 20: ...xx Conformance to EC Directives 6 ...
Page 48: ...28 Applications Precautions Section 1 4 Example CX Programmer Response Timeout Setting ...
Page 68: ...48 Backup Power Supply Wiring Optical Ring Systems Only Section 2 4 ...
Page 74: ...54 Using the C Library Section 3 2 ...
Page 110: ...90 Changing the Data Link Tables with Active Data Links Section 5 5 ...
Page 187: ......