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Lenze · I/O system 1000 · Reference Manual · DMS 5.0 EN · 09/2016 · TD17
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6
PROFIBUS communication
6.3
Communication
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6.3.3
Acyclic data transfer
An optional service expansion is the acyclic parameter data transfer of PROFIBUS-DP-V1. PROFIBUS-
DP-V0 and PROFIBUS-DP-V1 can be operated simultaneously in a network.
The integration of the acyclic service into the fixed bus cycle depends on the corresponding
configuration of the DPM 1:
• With configuration, a time slot is reserved.
• Without configuration the acyclic service is appended when a DPM 2 acyclically accesses a DP-
V1 slave.
• The acyclic service is always carried out with a lower priority.
Parameter data transfer between DPM 1 and slaves
[6-4]
Acyclic data transfer
1. DPM 1 has the transmission authorisation (token) and communicates with the slave 1, then
with slave 2 etc., until the last slave of the current list via the MS0 channel in a fixed sequence.
2. DPM 1 transfers the token to DPM 2.
3. In the remaining cycle time (time slot), DPM 2 establishes an acyclic connection to any slave to
transfer parameter data via the MS2 channel.
4. At the end of the running cycle time, DPM 2 returns the token to DPM 1.
Depending on the remaining cycle time, several time slots may be required for the non-cyclical
transmission of the data records.
5. When all data records have been transferred, DPM 2 cancels the connection within one time
slot.
Cyclic process data transfer between DPM 1 and slave 1 ... 3
Acyclic parameter data transfer between DPM 2 and slave 3
Token
Master 1
(DPM 1)
Master 2
(DPM 2)
Slave 1
Slave 2
Slave 3
0
0
0
1
Note!
DPM 1 can exchange parameter data acyclically with the slaves via the MS1 channel.