BECKHOFF ILxxxx-B520 - Manual (Page 11)

IO Data Mapping
ILxxxx-B520 8
IO Data from Master /
Scanner to ILxxxx-B520
(Default Assignment / As-
sembly Object) IO-Data which is transferred from the DeviceNet Master / Scanner to the
ILxxxx-B520 begins with byte-oriented values which is the data for the ana-
log output and special signal extension boxes. The bit-oriented data for the
digital outputs of the ILxxxx-B520 and the digital output extension boxes is
transmitted after the byte-oriented data. If the total number of digital inputs
is not a multiple of 8, there will be a number of bits left over in the last data
byte. These will be discarded.
IO Data from ILxxxx-B520
to Master / Scanner to
(Default Assignment / As-
sembly Object)
Status Byte at the end of
the input data IO-Data which is transferred from the ILxxxx-B520 to the DeviceNet Master
/ Scanner begins with byte-oriented values which is the data from the ana-
log input and special signal extension boxes. The bit-oriented data for the
digital inputs of the ILxxxx-B520 and the digital input extension boxes is
transmitted after the byte-oriented data. If the total number of digital out-
puts is not a multiple of 8, there will be a number of bits left over in the last
data byte. These will be discarded.
An extra status byte is transferred at the end of the Input Data and returns
the status of the ILxxxx-B520 with the following meaning:
Bit0: IL_Error
: IO Error, internal Data exchange ILxxxx-B520 has failed
Bit1: IL-Cfg : ILxxxx-B520 Configuration Error
Bit2: reserved
Bit3: Diag
: Diagnosis of analog Channel
Bit4: reserved
Bit5: reserved
Bit6: reserved
Bit7: FB_Error : Fieldbus Error / Idle Mode
The status byte corresponds to the Attribute “IL-Status” of the IL-Config
Object.
Byte Data
...
...
...
...
...
Byte n
Bit Data
Byte 0
IO Data from Master /
Scanner to ILxxxx-B520
...
...
...
...
...
Byte n
Byte 0
IO Data from ILxxxx-
B520 to Master / Scanner
Bit Data
Byte Data
Status Byte
...