4-11-3 Calculation Examples For Data Link I/O Response Times - Omron CS1W-SLK11-21 - 06-2004 Manual

Data Link Characteristics
Data Processing Time
Data link scale
Data link is established for both areas 1 and 2
Data link is established for only area 1 or area 2

4-11-3 Calculation Examples for Data Link I/O Response Times

The time required for interrupt processing for data exchange (data processing
time) can be roughly estimated as shown in the following table.
0.001 × Total number of data link words + 1.7 (ms)
0.001 × Total number of data link words + 1.4 (ms)
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.
Input
Input
LRXXX
Item
Maximum node address
Number of polled nodes
Maximum number of frames
Number of participating nodes
Number of nodes participating in data links
Number of send words for area 1
Number of send words for area 2
Messages
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.
Equation for estimating data processing time
Coaxial cable
PLC 1
SYSMAC LINK
Unit
Node 1
LRXXX
Data link
62
4
10
8
8
8 words per node
16 words per node
None
Section 4-11
PLC 7
SYSMAC
LINK Unit
Output
Node 7
Output
Condition
65