BECKHOFF BK5200 - Manual (Page 25)

BK5200, BK5210, LC5200 DeviceNet
BK52x0 25
Object 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 object sent to the
master
Status byte=0: I/O RUN
Status byte=1: I/O ERR 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 strip, 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 strip is not a
multiple 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, and this returns the status of the terminal
strip. Its value corresponds to the status displayed on the I/O LEDs on the
Bus Coupler: while the terminal strip 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
LED "RUN"
LED "OVERFL" Module status LEDs ”MS”
The green LED flashes:
Configuration is incorrect
The green LED is permanently lit: Status is OK.
The red LED flashes: Receive queue overflow
The red LED is permanently lit: Status is OK.
LED "CONNECT"
LED "BUS OFF" Network status LEDs ”NS”
The green LED flashes:
Bus Coupler is ready for
communication, but not yet
assigned to the master.
The green LED is permanently lit:
Bus Coupler is assigned to the
master, data is being exchanged.
The red LED flashes:
Timeout on I/O connection
The red LED is permanently lit: BUS OFF: CAN error, devices
have identical node addresses.
Input/output status ”I/O”
LED "I/O RUN" The green LED is lit: The Bus Terminals are working
correctly.
LED "I/O ERR" The red LED is lit: I/O error, a Bus Terminal or an
internal K-Bus with a fault.
LED "I/O ERR" The red LED flashes: The Bus Terminals are being
configured