ATI Q46 Profibus Communications Manual
7
O&M Manual
Rev-E (2/16)
1.5 Cable Specification
The cable used for Profibus communication is specifically designed for such a purpose, and
ONLY certified Profibus DP cable should be used in the network connections. For the Q46, the
cable is terminated inside a special DB9 bulkhead connector that attaches to the side of the Q46
enclosure.
Figure 3 - Certified Network Cable Specifications
Communication speed can be affected by segment cable length, and the number of repeaters
included in a given segment (up to three can typically be used.) Although it might seem desirable
to always attempt to run at the maximum 12M bus speed, in reality, users adjust bus speed for
maximum network reliability and minimize loss of data. Therefore, the baud rate is often adjusted
for the specific environment. A setting of 1.5MHz is the most common starting point. The Q46
supports automatic baud rate selection from the master.
Data Transmission
Rate (Hz)
Maximum
Segment
Length
(m)
Maximum Total Network
Length (m)
Figure 4 - Baud Rate vs. Network Segment Lengths (Typ.)
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