DeviceNet / CANopen
Leuze electronic DDLS 200 49
TNT 35/7-24V
9.7.3 Synchronous messages
As a result of dividing the network into multiple segments and the resulting delay of messages be-
tween the segments, there are limitations associated with synchronous transmission. The following
types of telegrams are affected:
DeviceNet
CANopen
Message Function Effects caused by DT
Bit strobe
Master simultaneously transmits 1 bit
of output data to all participants.
All participants receive the message, but not
simultaneously. Should therefore not be used
for synchronization purposes.
Broadcast
messages
One message is simultaneously
transmitted to several participants.
All participants receive the message, but not
simultaneously.
Message Function Effects caused by DT
Sync
All participants are synchronized on a
sync telegram, e.g. input data is read
in and transmitted
The message is transmitted to all partici-
pants. Participants in another segment, e.g.
segment 2, receive this telegram with a time
delay and are, thus, not synchronized with
the participants in segment 1.
Time stamp Transmits time information.
All participants receive the message. Partici-
pants in a segment other than the producer of
the message receive this information with a
time delay. This results in an error in the tim-
ing information:
Min. T
tot
= number of bits in the telegram x
(0.5 µs +T
Bit
) + 100 µs
DDLS200_E.book Seite 49 Mittwoch, 19. Februar 2020 12:22 12
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