本人在学习TRIO MC405，在Trio BASIC help文档里没看懂MOVELINK的扩展参数base_dist的怎么用及怎么计算的？

Example 5:

Using the base speed extension function it can be constructed from 3 MOVELINK commands which will be merged together automatically by the Motion Coordinator.

MOVELINK ( 200 , 250 , 100 , 0 , 2 , 16 )' Accel and const speed(blue and green)
MOVELINK ( 60 , 90 , 0 , 90 , 2 , 16 , 0 , 30 )' 1st deceleration (orange and red)
MOVELINK ( 110 , 360 , 0 , 60 , 2 , 16 )' Second const speed and 2nd decel

The first constant speed part has a ratio of 1:1.

The first decel goes down to a ratio of 1:3.

The final constant speed part has the ratio 1:3 and then decel to stopped. 

速度降到1：3时，30是怎么得到的？