BECKHOFF BK7500 - Manual (Page 10)

Basic information
10 BK7500
Master Data Telegram (MDT)
The MDT is sent by the master as a broadcast to all devices. It contains
the data for all the slave devices. Because of different configurations, the
data length can vary.
Drive Telegram (AT)
Each slave sends its output data in the appropriate time slot. The telegram
contains its station address, so that the master can identify it.
MST AT AT MDT MST
1.1
1.2
t
1.n
1.n+1
t
Scyc
t
2
t
t
t
(CP4)
1 2
AT
n
AT
n+
1
(CP4)