63
6 F 3 B 0 3 5 6
Actual transmission cycle time (TCY) is sum of above TSCN and TMSG. But when TSCN is
short, Time for software operation (TSOFT) is not neglected. Therefore, Actual transmission
cycle time is expressed as follows.
If TSOFT < TSCN / 2
TCY = TSCN + TMSG
If TSOFT > TSCN / 2
TCY = TSCN / 2 + TSOFT + TMSG
TSOFT = ( 370 * NSTN + 2.8 * WSCN ) / 1000 [ms]
Set the Target Scan Time (Target Cycle Time) larger than above TCY.
Here;
NSTN: Number of connected stations
WSCN: Total size of send data (words)
WMSG: Maximum message size of send data (words)
MSTN: Number of message transmission stations
(Note 1) The minimum TSCN is about 3 ms. Even if the above calculation result is less than 3 ms,
actual TSCN is limited by this value.