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.
Connection examples are shown below.
With signal ground reference terminal
G R - +
1
DGND
2
DGND
2
DGND
2
3
3
3
ON
1
ON
1
ON
1
B+
A-
B+
A-
B+
A-
Without signal ground reference terminal
G - +
B+
A-
DGND
1
2
B+
A-
DGND
2
B+
A-
DGND
2
100 ohm
3 3 3
ON
1
ON
1
ON
1
Automation controller1
Drive2
Termination switch. The devices at the ends of the fieldbus must have termination
on. All other devices must have termination off.
3
Electrical installation – North America 107
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