Data Exchange and Parameterization
Application Manual POWERLINK Controlled Node
Document no. 5.13013.04
33
of 80
5
5.3.1 Frame structure SoA
The structure of the Start of Asynchronous (SoA) frame is as follows:
Bit offset
Byte offset 7 6 5 4 3 2 1 0
0 Message Type = SoA (0x05)
1 Destination = Broadcast address (0xFF)
2 Source = Node ID of the MN (0xF0)
3 NMTStatus
4 res res res res res EA/res ER/res res
5 reserved
6 RequestedServiceID (see the following table)
7 RequestedServiceTarget
8 EPLVersion
9 ... 45 reserved
EA (Exception Acknowledge)
ER (Exception Reset)
NoService 0x00 Asynchronous slot is not assigned to any node
IdentRequest 0x01 Identification of inactive nodes
StatusRequest 0x02 Request the status and error information of sin-
gle nodes
NMTRequestInvite 0x03 Requesting a node to send an indicated NMT
command.
Manufacturer specific 0xA0 .. 0xFE Manufacturer specific purposes
UnspecificInvite 0xFF Requesting a node to send an indicated transmit
request.
RequestedService ID Description