FC 300 CANopen
MG.33.J1.02 VER. 050301 – VLT is a registered Danfoss trademark 39
How to Access FC 300 Parameters
Service Data Objects (SDO)
FC 300 parameters can be accessed by Service Data Objects, SDOs. The SDOs are used for
communicating non-time-critical data.
Structure of SDO COB-ID entry
Unsigned32
MSB LSB
bits
31 30 29 28-11 10-0
11-bit-ID 0/1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
11-bit Identifier
29-bit-ID 0/1 0 1 29-bit Identifier
Description of SDO COB-ID entry
Bit number Value Meaning
0 SDO valid
31(MSB)
1 SDO not valid
30
0 Reserved (always 0)
0 11-bit ID (CAN 2.0A)
29
1 29-bit ID (CAN 2.0B)
0 If bit 29=0
28-11
X If bit 29=1: bits 28-11 of 29-bit-COB-ID
10-0 (LSB)
X Bits 10-0 of COB-ID
An SDO is only valid if both SDO-valid-bits are 0. Bit 29 may be static (not changeable) e.g. due to
hardware restrictions.
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