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CHAPTER 4 FUNCTIONS
4
4.1 Cyclic Transmission Function
4.1.6 Cyclic transmission punctuality assurance
(2) When the punctuality assurance setting is enabled
Each of stations performs the specified number of transient transmissions in one link scan to keep the link scan
time constant, and the punctuality of cyclic transmission is ensured.
(a) When the actual number of transient transmissions is less than the specified one
Dummy data are sent to cover the shortfall.
(b) When the actual number of transient transmissions exceeds the specified one
They are divided and transmitted in several link scans.
(3) Setting the punctuality assurance and the number of transient
transmissions
Set the punctuality assurance and the number of transient transmissions in "Supplementary Setting" of "Network
Range Assignment" of the control station. ( Page 201, Section 6.3.6)
Enable "Punctuality is guaranteed", and set a value for "Maximum No. of Transients in One Station".
Control station
No.1
Normal station
No.2
Normal station
No.3
Normal station
No.4
Cyclic transmission
Transient transmission (dummy transmission)
Transient transmission
Request
Response
Link scan time is constant since each station sends
a specified number of transient transmissions.
Link scan time
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