Omron CVM1-CLK21, Operation Manual

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Data Link I/O Response Time Section 8-3
response time. The following is a calculation example of the maximum and
minimum I/O response times for the system configuration shown below.
The data link I/O response time depends on the communications cycle time,
input ON delay, output ON delay, and the cycle times of the PCs involved. The
values are detailed below.
Communications Cycles
Time Communications cycle time =
10
×
(8 + 16)
×
8 + 600
×
4 + 290
×
8 + 320
×
0 + 4
×
0 + 3,290
= 9,930
µ
s
≅
9.9 ms
Input ON Delay The input ON delay is the time it takes for an input device to turn ON an input
to the PC after receiving an input signal. In this system the input ON delay is
1.5 ms.
Output ON Delay The output ON delay is the time it takes for an output device to turn ON an
output signal after receiving an output from the PC. In this system the output
ON delay is 15 ms.
Cycle Times The cycle time of the PC at node #1 is 15 ms or 8 ms.
The cycle time of the PC at node #7 is 20 ms or 8 ms.
PC PC
C
L
K
#1
C
L
K
#1
Input
LRXXXX Output LRXXXX
CLK: Controller Link Unit
System configuration
Baud rate: 2 Mbps
Maximum node address: 32
Number of polled nodes per comm cycle: 4
Number of event-frames per comm cycle: 35
Nodes in network:
8 nodes
Nodes in data links: 8 nodes
Words sent in area 1: 8 words per node
Words in area 2: 16 words per node
No messages communications are performed.
A single Controller Link Unit is mounted to each
CPU Rack.
Input