Communication / PROFIBUS 09.2008
6SE7087-6QX70 (Version AK) Siemens AG
8.2-86 Compendium Motion Control SIMOVERT MASTERDRIVES
8.2.8.7 CBP2 with clock synchronization on a PROFIBUS master in accordance
with PROFIdrive V3
CBP2 with clock synchronization is not supported by MASTERDRIVES
VC.
The CBP2 from V2.21 enables the clock cycles of several
MASTERDRIVES MC to be synchronized according to PROFIdrive
version 3 on the isochronous PROFIBUS.
You will need:
♦ A configuring tool that supports clock synchronization to PROFIdrive
V3 (e.g. SIMOTION SCOUT)
♦ A PROFIBUS master that supports clock synchronization to
PROFIdrive V3 (e.g. SIMOTION C, P or D)
♦ CBP2 from V2.21
♦ MASTERDRIVES MC (Compact or Compact Plus), software
version V1.6
The pulse frequency of the drive must be set to 5.3 kHz for clock
synchronization in accordance with PROFIdrive V3. The following
combinations are possible with a PROFIBUS transmission rate of
12 Mbit/s:
Synchronized time slot in
basic unit
DP cycle
T4 3 ms
T5 6 ms
Configuring the MASTERDRIVES MC:
♦ Set pulse frequency to 5.3 kHz. Select P340 = 5.3 in the drive settings
screen.
♦ Enable the source for clock sycnchronization via P744:
P744.1 P744.2 Synchronization source
0 1 First CBP2
1 1 Second CBP2
0 0 (first SLB)
1 0 (second SLB)
♦ A cycle monitoring function can be activated with P723 = 1 for the
isochronous PROFIBUS.
Function: Synchronization telegrams that are received outside the bus
cycle (± 12.8 µs) are ignored.
Advantage: Under fault conditions, faulty and displaced telegrams are
detected so that synchronization errors can be avoided.
♦ All the tasks to be synchronized must be in the same time slot,
especially the processing of setpoints and actual values to and from
the CBP2.
Cycle times
Drive configuring
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