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• When a communication failure occurs due to a problem such as noise, change the value so that the number
of retries may increase. The number of retries is obtained using the following formula. (When using the
default values, 3 = (60 20))
Number of retries = TCP ULP timer value TCP resend timer value
When the number of retries is three and data sending fails, a data sending error occurs at the timing
shown in the figure below (in communications using the fixed buffer).
• When not performing the above retry process (set 0 times), configure the setting so that the following
formula is met.
Data
command
E71
1st retry 2nd retry 3nd retry
AAA
TCP ULP timeout value
A: TCP resend timer value
(The time at which data are sent when ACK is not returned after data transmission)
BUFSND instruction
Completion device + 1
BUFSND instruction
1 scan
TCP ULP
timer value
TCP end
timer value
=
TCP resend
timer value
=
(Set the same value for the timer values.)
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