Calculation Example - Omron CS1W-CLK12-V1 Operation Manual

Data Link I/O Response Time
9-3-3

Calculation Example

PLC
C
L
K
#1
Input
Input LRXXXX
Communications Cycle
Time
Input ON Delay
Output ON Delay
Cycle Times
192
The data links of the Controller Link Unit require a slight time delay from the
time the data link area of one node is changed until this change is reflected in
the data link area at another node. This time delay is called the data link I/O
response time. The following is a calculation example of the maximum and
minimum I/O response times for the system configuration shown below.
CLK: Controller Link Unit
PLC
C
System configuration
L
K
#7
LRXXXX Output
No messages communications are performed.
A single Controller Link Unit is mounted to each CPU Rack.
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 PLCs involved.
The values are detailed below.
Communications cycle time =
9.1 × (8 + 16) × 8 + 1,740 × 4 + 960 × 8 + 2 × 7 × 8 + 4,800 =21,299 µ s ≅
22 ms
The input ON delay is the time it takes for an input device to turn ON an input
to the PLC after receiving an input signal. In this system the input ON delay is
1.5 ms max.
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 PLC. In this system the output
ON delay is 15 ms max.
The cycle time of the PLC at node #1 is 15 ms or 8 ms.
The cycle time of the PLC at node #7 is 20 ms or 8 ms.
H-PCF cable used
Connection method:
Transmission distance:
Maximum node address:
Number of polled nodes per comm cycle: 4
Number of event-frames per comm cycle: 35
Nodes in network:
Nodes in data links:
Words sent in area 1:
Words in area 2:
Section 9-3
Token-ring mode
8 km
62
8 nodes
8 nodes
8 words per node
16 words per node