Hardware configuration.
CNC 8070
7.
CENTRAL UNIT FOR CABINET (Q7-A PLATFORM).
Connections.
·174·
(REF: 1911)
Identification of the first and last elements of the bus. Line
terminating resistor.
In the CAN bus, it is necessary to use a line terminating resistor to identify which are the
elements that occupy the ends of the bus; i.e. the first and last physical element in the
connection. For the central unit, the terminating resistor is factory installed because the CNC
is always at one end of the bus.
Bus type selector: CANfagor / CANopen.
At the CNC, the type of CAN bus is selected by means of the machine parameters (parameter
CANMODE),
Selection of the cable length of the CANfagor bus cable.
Using the CANfagor type bus requires the definition of the maximum length of the bus with
parameter CANLENGTH.
Selecting the speed for the CANopen bus.
When using the CANopen protocol, the transmission speed at the bus is defined in each node
and they all must run at the same speed. The transmission speed depends on the total length
of the bus. Using the following illustrative values; assigning other values may cause
communication errors due to signal distortion.
Selecting the speed at the CNC.
At the CNC, the transmission speed is selected by means of the machine parameters
(parameter CANOPENFREQ).
Speed Length of the CAN bus.
1000 kHz Up to 20 meters.
800 kHz From 20 to 40 meters.
500 kHz From 40 to 100 meters.
250 kHz From 100 to 500 meters.
The speed of 250 kHz is only available to communicate with the keyboards and
RIOW and RIOR series remote modules; this speed is not available for the RIO5
series remote modules.
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