ABB ACS550-01 - Communication Set-Up - EFB

150 ACS550 User’s Manual
Embedded Fieldbus
• To reduce noise on the network, terminate the RS485 network using 120 Ω
resistors at both ends of the network. Use the DIP switch to connect or disconnect
the termination resistors. See following diagram and table.
• Connect the shield at each end of the cable to a drive. On one end, connect the
shield to terminal 28, and on the other end connect to terminal 32. Do not connect
the incoming and outgoing cable shields to the same terminals, as that would
make the shielding continuous.
• For configuration information see the following:
– "Communication Set-up – EFB" below.
– "Activate Drive Control Functions – EFB" on page 152.
– The appropriate EFB protocol specific technical data. For example, "Modbus
Protocol Technical Data" on page 160.
Communication Set-up – EFB
Serial Communication Selection
To activate the serial communication, set parameter 9802 COMM PROTOCOL SEL =
1 (
STD MODBUS).
Note! If you cannot see the desired selection on the panel, your drive does not have
that protocol software in the application memory.
X1 Identification Hardware Description
28 Screen
29 B (Positive +)
30 A (Negative -)
31 AGND
32 Screen
Terminated Terminated
Station
Station Station
Station
28 SCR
29 B
30 A
31 AGND
32 SCR
SCR
+
-
GND
RS485 Multidrop application
RS485 interface
Bus termination
OFF position ON position
SCR
+
-
GND
J2
ON
J2
ON