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Max. cable length & modules per CAN bus
Maximum Cable Length and Modules per CAN Bus
There are several parameters that have to be considered when building a CAN bus network with CPAD
modules.
Baud rate
A higher baud rate allows a higher sample rate or using more CPADs. On the other hand, it reduces the
maximum cable length.
Sample rate
Every baud rate allows a certain aggregated sample rate. Lowering the baud rate allows using more modules
at the full sample rate.
Cable Length
The baud rate and the number of connected modules limit the cable length. Every module limit the bus
length by 2 meter.
Number of modules
The maximum is 30 CPADs per bus.
Staying below the above mentioned limits allow a stable CAN bus communication. If more modules are
required, use a separate CAN bus.
CAUTION: Never set the baud rate higher than the cable length allows. This will end up in an
unstable bus. In worst You will have to disconnect and reset the modules one by one in worst case.
Recommended maximum
Baud rate
[kbaud]
Sample rate
[S/sec]
Bus cable length
[m]
Modules
[Pcs.]
CPAD3
1000 100 10 10
500 100 50 10
500 50 50 20
250 100 120 5
250 50 120 10
125 100 400 3
50 100 800 1
CPAD2
1000 10 10 10
500 10 10 30
500 10 50 10
250 10 120 30
125 10 400 30
50 10 800 10
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