Omron CS1W-SLK11-21 - 06-2004, Руководство пользователя

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65
Data Link Characteristics Section 4-11
Data Processing Time The time required for interrupt processing for data exchange (data processing
time) can be roughly estimated as shown in the following table.
4-11-3 Calculation Examples for Data Link I/O Response Times
In a SYSMAC LINK Unit data link, there is a slight time lag between the time
input is received at one node in the link and the time output is made from
another node in response to this input. This time lag is called the data link I/O
response time. In this section, examples illustrating how to calculate the mini-
mum and maximum I/O response times are given for the configuration shown
below.
The time required for each of the above items is given below:
Communications Cycle Time
62
×
0.085 + 10
×
0.654 + 4
×
0.75 + 8
×
0.056 + 192
×
0.01 + 1.322 = 18.5
≈
19 ms (For details, refer to page 62.)
Input ON Response Time
This is the time between an input signal being received and the relevant input
bit actually turning ON. Taken as 0 ms (min.) to 1.5 ms (max.) in this example.
Output ON Response Time
This is the time between the relevant output bit turning ON in the CPU Unit
and the output signal actually being sent. Taken to be 0 ms (min.) to 1.5 ms
(max.) in this example.
Data link scale Equation for estimating data processing time
Data link is established for both areas 1 and 2 0.001
×
Total number of data link words
+
1.7 (ms)
Data link is established for only area 1 or area 2 0.001
×
Total number of data link words
+
1.4 (ms)
Item Condition
Maximum node address 62
Number of polled nodes 4
Maximum number of frames 10
Number of participating nodes 8
Number of nodes participating in data links 8
Number of send words for area 1 8 words per node
Number of send words for area 2 16 words per node
Messages None
Coaxial cable
Input
SYSMAC LINK
Unit
Node 1
Output
SYSMAC
LINK Unit
Node 7
Output Input
Data link
LRXXX
LRXXX
PLC 7
PLC 1