Synchronous Messages - Leuze electronic DDLS 200 Series Original Operating Instructions

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
Message
Master simultaneously transmits 1 bit
Bit strobe
of output data to all participants.
Broadcast One message is simultaneously
messages transmitted to several participants.
CANopen
Message
All participants are synchronized on a
Sync sync telegram, e.g. input data is read
in and transmitted
Time stamp Transmits time information.
Leuze electronic
Function
Function
DDLS 200
DeviceNet / CANopen
Effects caused by DT
All participants receive the message, but not
simultaneously. Should therefore not be used
for synchronization purposes.
All participants receive the message, but not
Effects caused by DT
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.
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 = number of bits in the telegram x
tot
(0.5 µs +T ) + 100 µs
Bit
simultaneously.
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