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Configuring the fieldbus
6.3 Communication over CANopen
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
153
6.3.1
CANopen functionality of the converter
CANopen is a CAN-based communication protocol with linear topology that operates on the
basis of communication objects (COB).
Communication between the converter and control can be established via Predefined
connection set (Page 165) or via Free PDO mapping (Page 166)
Communication objects (COB)
The converter operates with communication objects from the following profiles:
●
CANopen communication profile DS 301 version 4.0
●
Device profile DSP 402 (drives and motion control) version 2.0
●
Indicator profile DR303-3 version 1.0.
Specifically, these are:
●
SDO
Service data objects for reading and changing parameters
●
PDO
Process data objects to transfer process data, TPDO to send, RPDO to receive
●
NMT
Network management objects (NMT) for controlling CANopen communication and for
monitoring the individual nodes on the basis of a master-slave relationship.
●
SYNC
Synchronization objects
●
EMCY
Time stamp and fault messages
COB ID
A communication object includes data – which is transferred – and an 11 bit COB-ID, which
uniquely identifies it. The priority when executing the communication objects is controlled
using the COB-ID. The communication object with the lowest COB-ID always has the highest
priority.
COB ID for individual communication objects
You will find the specifications for the COB IDs of the individual communication objects
below
•
COB ID
NMT
= 0
cannot be changed
•
COB ID
SYNC
= free in most cases, this is preassigned with 80 hex
•
COB ID
EMCY
= free In most of the cases, COB ID
SYNC
+ node-ID = COB-ID
EMCY
•
COB-ID
TPDO
= free In the free PDO mapping *)
•
COB-ID
RPDO
= free In the free PDO mapping *)
•
COB ID
TSDO
= 580 + Node-ID
•
COB ID
RSDO
= 600 + Node-ID
•
COB ID
Node Guarding/Heartbeat
= 700 + Node-ID
*) COB-ID for RPDO and TPDO for the "Predefined Connection Set", seePage (Page 165).
Summary of Contents for SINAMICS G120 CU230P-2
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