Light-Emitting Diodes - Beckhoff BK5200 Technical Documentation Manual

Some of the bits in the last
byte may be unused
Data string from the bus
coupler to the DeviceNet
master for transferring the
input data:
first byte-oriented data,
and then bit-oriented data.
Status byte at the end of
the string sent to the master
Status byte=0: I/O RUN
Status byte=1: I/O ERR
LED "RUN"
LED "OVERFL"
LED "CONNECT"
LED "BUS OFF"
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BK5200
Additional bytes are read from the data string until the last digital output in
the terminal row has been dealt with. If the total number of digital outputs is
not a multiple of 8, there will be a number of bits left over in the last data
byte; these will be discarded.
The object sent by the bus coupler to the DeviceNet master also contains
the byte-oriented data at the beginning, followed by the bit-oriented data.
Transfers in this direction also include a status byte, which comes right at
the end of the object.
The byte-oriented data contains the values from the analog inputs and the
bit-oriented data the values from the digital inputs.
The first four bytes contain the data from the first analog input terminal in
the terminal row, where each pair of bytes is the 16-bit value of one input.
The next four bytes correspond to the next analog input terminal and so on,
analogously to the procedure described above.
After the byte-oriented data from all the analog inputs come the values
from the digital inputs. Eight digital inputs are transferred in each byte. As
before, if the total number of digital inputs in the terminal row is not a mul-
tiple of 8, the last data byte will contain one or more superfluous bits.
An extra status byte is transferred at the end of each string sent by the bus
coupler to the DeviceNet master, this returns the status of the terminal row.
Its value corresponds to the status displayed on the I/O LEDs on the bus
coupler: while the terminal row is functioning correctly, the LED "I/O RUN"
will be lit and the status byte will contain the value 0; as soon as an error
occurs, the LED "I/O ERR" will light up and the status byte will contain the
value 1.

Light-emitting diodes

Module status LEDs "MS"
The green LED flashes:
The green LED is permanently lit:
The red LED flashes:
The red LED is permanently lit:
Network status LEDs "NS"
The green LED flashes:
The green LED is permanently lit:
BK52x0 DeviceNet
Configuration is incorrect
Status is O.K.
Receive queue overflow
Status is O.K.
Bus coupler is ready for communi-
cation, but not yet assigned to the
master.
Bus coupler is assigned to the
master, data is being exchanged.
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BK5200