BECKHOFF FC5101 - Manual (Page 52)

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Client -> Server, Upload Response
11 bit identifier 8 byte of user data
0x580 (=1408dez) + node ID 0x4x Index0 Index1 SubIdx Data0 Data1 Data2 Data3
Parameters Explanation
Index0 Index low byte (Unsigned16, LSB)
Index1 Index high byte (Unsigned16, MSB)
SubIdx Subindex (Unsigned8)
Data0 Data low low byte (LLSB)
Data3 Data high high byte (MMSB)
Parameters whose data type is Unsigned8 are transmitted in byte D0, parameters whose type is Unsigned16
use D0 and D1.
The number of valid data bytes is coded as follows in the first CAN data byte (0x4x):
Number of parameter bytes 1 2 3 4
First CAN data byte 0x4F 0x4B 0x47 0x43
Client -> Server, Download Request
11 bit identifier 8 byte of user data
0x600 (=1536dez) + node ID 0x22 Index0 Index1 SubIdx Data0 Data1 Data2 Data3
Parameters Explanation
Index0 Index low byte (Unsigned16, LSB)
Index1 Index high byte (Unsigned16, MSB)
SubIdx Subindex (Unsigned8)
Data0 Data low low byte (LLSB)
Data3 Data high high byte (MMSB)
It is optionally possible to give the number of valid parameter data bytes in the first CAN data byte
Number of parameter bytes 1 2 3 4
First CAN data byte 0x2F 0x2B 0x27 0x23
This is, however, not generally necessary, since only the less significant data bytes up to the length of the ob-
ject directory entry that is to be written are evaluated. A download of data up to 4 bytes in length can therefore
always be achieved in Beckhoff bus nodes with 22h in the first CAN data byte.
Client -> Server, Download Response
11 bit identifier 8 byte of user data
0x580 (=1408dez) + node ID 0x60 Index0 Index1 SubIdx 0x00 0x00 0x00 0x00
Parameters Explanation
Index0 Index low byte (Unsigned16, LSB)
Index1 Index high byte (Unsigned16, MSB)
SubIdx Subindex (Unsigned8)