Mitsubishi Electric MELSEC Q Series Reference Manual page 204

(3) Punctuality is guaranteed
Set whether or not to assure the punctuality. (Default: Punctuality is guaranteed)
If the "Punctuality is guaranteed" checkbox is checked, each station performs transient transmissions for the
number of times specified in "Maximum No. of Transients in One Station", which keeps the link scan time
constant. (
The following describes the link scan operation varied depending on whether the punctuality is assured or not.
Punctuality
assurance
Punctuality is
guaranteed.
Punctuality is not
guaranteed.
(4) Maximum No. of Transients in One Station
Set the number of transient transmissions that one station can perform in one link scan. (Setting range: 1 to 10
times, Default: 2 times)
202
Page 80, Section 4.1.6)
• Link scan time is kept constant.
• Link scan time is longer compared to the case where "Punctuality is not guaranteed".
• Link scan time increases as the value set in "Maximum No. of Transients in One Station"
increases.
• Link scan time will vary when transient transmission is requested.
• The variation in link scan time increases as the value set in "Maximum No. of Transients in One
Station" increases.
Link scan operation