Parameter Access; Explicit Messages; Object Classes - Danfoss VLT DeviceNet MCA 104 Programming Manual

Parameter Access

5 Parameter Access

5.1 Explicit Messages

DeviceNet is based on the CAN protocol. Every message contains an 11 bit CAN identifier field to define the connection ID.
These CAN identifiers are also used to determine access priority.
The MAC ID is stored in the header of the message, which is split into 4 different message groups, see Table 5.1.
10 9 8 7 6
0 Group 1 ID
1 0 MAC ID
1 1 Group 3 ID
1 1 1 1 1
1 1 1 1 1
Table 5.1 MAC ID
It is possible to access frequency converter parameters via the standard DeviceNet service explicit message. Two classes of
explicit messages are supported:
Message group 2: Explicit messages take place via pre-defined master/slave connections.
Message group 3: Explicit messages take place via dynamically established lower prioritized connections.

5.2 Object Classes

Access is available to the following standard DeviceNet objects.
Class ID 01h Identity object
Class ID 03h DeviceNet object
Class ID 04h Assembly object
Class ID 05h Connection object
Class ID 0Fh Parameter object
Table 5.2 Standard DeviceNet Objects
The following DeviceNet vendor-specific objects are also available:
Class ID 100d to 119d Danfoss classes.
The object classes are described in chapter 5.3 DeviceNet Object Classes and chapter 5.4 Danfoss Object Classes.
MG92F102
Programming Guide
5 4 3 2 1
Source MAC ID
Group 2 ID
Source MAC ID
Group 4 ID
1 1 X X X
Class ID 10h
Class ID 28h
Class ID 29h
Class ID 2Ah
Class ID 2Bh
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0 Identifier bits
Message group 1
Message group 2
Message group 3
Message group 4
X Invalid CAN identifiers
Parameter group object
Motor data object
Control supervisory object
AC/DC drive object
Acknowledge handler object
5 5
17