Beckhoff EL6731 Documentation page 51

5.1.5.5 FDL interface
The FDL interface can be used to send FDL telegrams and pick up received FDL telegrams via ADS [} 42].
This functionality is supported by the FC31xx from V02.66 and the EL6731 from V00.75.
FDL send
ADS Write can be used to transfer one or several FDL requests or FDL responses. The FDL requests were
sent in the specified order, the FDL responses are sent when they are retrieved by another master.
ADS-Write parameters Meaning
Net-ID
Port
IndexGroup
IndexOffset
Length
Data
EL6731
Net-ID of the master (see the device's ADS [} 92] tab)
200
0xF400
0
Data length
Byte Offset Meaning
0 Cmd: 1=request follows, 3=response follows, 255=enable reception for
FDL service on all SAPs (no further data (length=1))
1 Request
Response
2 DA byte (bit 7 indicates whether a DSAP exists)
3 SA byte (bit 7 indicates whether an SSAP exists)
4 Request
Response
5 Length of the following bytes of the request or response
6 if DA.7=1: DSAP otherwise if SA.7=1: SSAP otherwise first data byte
7 if DA.7=1 and SA.7=1: SSAP otherwise if DA.7=1 or SA.7=1 first data
byte otherwise second data byte
8 if DA.7=1 and SA.7=1: first data byte otherwise if DA.7=1 or SA.7=1
second data byte otherwise third data byte
9-n further data of the request or response
n+1 perhaps next Cmd: 1=request follows, 3=response follows
... ...
Version: 2.8
Parameterization and commissioning
0
0=send single, 1=send multiple
Request: 0x03=SDA low, 0x05=SDA high, 0x04=SDN
low, 0x06=SDN high, 0x0C=SRD low, 0x0D=SRD high
Response: 0x08=DL, 0x0A=DH
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