ACS550 User’s Manual 149
Embedded Fieldbus
– Actual value 4
– Actual value 5
– Actual value 6
– Actual value 7
– Actual value 8
The content of these words is defined by profiles. For details on the profiles used,
see "ABB Control Profiles Technical Data" on page 168.
Note! The words “output” and “input” are used as seen from the fieldbus controller
point of view. For example an output describes data flow from the fieldbus controller
to the drive and appears as an input from the drive point of view.
Planning
Network planning should address the following questions:
• What types and quantities of devices must be connected to the network?
• What control information must be sent down to the drives?
• What feedback information must be sent from the drives to the controlling
system?
Mechanical and Electrical Installation – EFB
Warning! Connections should be made only while the drive is disconnected
from the power source.
Drive terminals 28…32 are for RS485 communications.
• Use Belden 9842 or equivalent. Belden 9842 is a dual twisted, shielded pair cable
with a wave impedance of 120
Ω.
• Use one of these twisted shielded pairs for the RS485 link. Use this pair to
connect all A (-) terminals together and all B (+) terminals together.
• Use one of the wires in the other pair for the logical ground (terminal 31), leaving
one wire unused.
• Do not directly ground the RS485 network at any point. Ground all devices on the
network using their corresponding earthing terminals.
• As always, the grounding wires should not form any closed loops, and all the
devices should be earthed to a common ground.
• Connect the RS485 link in a daisy-chained bus, without dropout lines.
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