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78 Electrical installation – IEC
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Additional information on the control connections
Embedded EIA-485 fieldbus connection
The EIA-485 network uses shielded, twisted-pair cable with a characteristic impedance
of 100 ... 130 ohm for data signaling. The distributed capacitance between conductors
is less than 100 pF per meter (30 pF per foot). Distributed capacitance between
conductors and shield is less than 200 pF per meter (60 pF per foot). Foil or braided
shields are acceptable.
Connect the cable to the EIA-485 terminal on the RIIO-01 I/O module. Obey these wiring
instructions:
• Attach the cable shields together at each drive, but do not connect them to the drive.
• Connect the cable shields only to the grounding terminal in the automation controller.
• Connect the signal ground (DGND) conductor to the signal ground reference terminal
in the automation controller. If the automation controller does not have a signal ground
reference terminal, connect the signal ground conductor to the cable shield through
a 100 ohm resistor, preferably near the automation controller.
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