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SCAIME Manual : NU-eNod4C-E-0418-196712-F.docx
5 COMMUNICATION
5.1 Communication Interface connections
5.1.1 Process control communication
Note: For a better transmission quality on a RS485 or CAN communication network it must be wired to follow
a line topology and must be terminated by an end of line (EOL) impedance at both ends. A 150Ω EOL impedance
is available on eNod4. To use this impedance set the corresponding jumper.
The PROFIBUS communication terminal is electrically isolated from power supply (isolation voltage: 1000V)
In PROFIBUS communication jumper JP5 must be removed. When eNod4 is positioned at the end of the line, use specific
connector DB9 for PROFIBUS with end of line resistor and bias resistors incorporated.
CAN communication is not electrically isolated from power supply. Admitted common voltage on CANBUS is 27V from
0V power supply. Depending on installation configuration, the usage of opt couplers or other galvanic isolation devices
is strongly recommended.
Note: If multiple elements connected to the CAN bus are using power supplies with different reference levels
(0V); the problem mentioned above can occur.
The data rate that can be transmitted on different buses depends on the length of the bus. The table below shows what
are the transmission rates supported by eNod4 and the corresponding maximum bus length:
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