YOKOGAWA F3LR02-0N, User Manual

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A6-1
IM 34M06H45-01E 7th Edition : Aug.30, 2019-00
A6. I/O Refresh Time
A6.1 Estimating I/O Refresh Time
To estimate the I/O refresh time, calculate the I/O refresh time separately for each port
of the main unit.
For details, refer to the following example.
F3SP05/08/21 F3SP25/35
Read input 11

s 10

s
Write output 27

s 21

s
FA0511.VSD
F3SP22/28/38/
53/58/59/66/67
9

s
15

s
I/O refresh time

There are 2 types of access, namely, 'read input' and 'write output'.
Calculate the I/O refresh time for each access type using the following formula and sum the
values.
I/O refresh time for
each access type
Time dependant on
access type
Time dependant
on transmission
distance
Access type
Formula:
Number of modules:

Number of modules corresponding to access type,
converted to 16-point module basis.
Number of modules,
converted to 16-point
basis

1.0s

s
Sum of I/O refresh times
for each type of access
=
= +
x
100 (m)
(m)
: Transmission distance
F3SP71/76
5.5

s
6.5

s