Manual – MOVIDRIVE® MDX60B/61B Communication and Fieldbus Unit Profile
63
5
Other unit functions via CAN interfaces
CAN Interfaces of MOVIDRIVE® B
5.5.4
Using CAN interfaces for integrated synchronous operation (ISYNC via SBus)
Basic operating
principle
A cyclical SBus telegram transfers a master position (e.g., the actual position of the
master or the value of the virtual encoder) from the master to the slaves via the SBus
(CAN). Sending and transferring the master position at equal intervals avoids aliasing.
Therefore, the time slices of the inverter are synchronized with a synchronization
message.
Settings for
operation using
SBus 1
1.
Master
A An SBus telegram cyclically (e.g. every 1 ms) sends the master position to the
slaves. It is created in IPOS
plus®
using the
_SBusCommDef
command:
B The synchronization message is an SBus telegram with high priority (small object
number), which is sent cyclically every 5 ms. It is created in IPOS
plus®
using the
_SBusCommDef
command:
C The synchronization ID (P817 or P885/895 with MOVIDRIVE
®
B) must be
different
from the object number of the synchronization message (see 1 B) and
all other object numbers sent on the SBus.
2.
Slaves
A The synchronization ID (P817 or P885/895 with MOVIDRIVE
®
B) must be
the
same
as the object number of the master’s synchronization message (see 1 B).
B The master position of the master is received and stored in an H variable.
TIP
Refer to the "MOVIDRIVE
®
MDX61B Internal Synchronous Operation" manual for
detailed information.
If you do not only want to synchronize several axes but also want to implement connec-
tion via fieldbus/SBus to a higher-level controller, we recommend that you use the
MOVI-PLC
®
DH..B option.
Structure
Element
Setting
SCTRCYCL
ObjectNo
As small as possible (see 4 D)
CycleTime
1 - 5 (see M filter description)
Offset
0
Format
4 (4-byte, Motorola format)
DPointer
e.g. 511 (= ActPosMot), 376 (= VEncoder)
Structure
Element
Setting
SCTRCYCL
ObjectNo
0, 1 or 2
CycleTime
5
Offset
0
Format
0 (0 byte)
DPointer
e.g. 511 (= ActPosMot), 376 (= VEncoder)
Summary of Contents for MOVIDRIVE MDX60B
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