ABB ACS550-02 User Manual page 18

16
Note! Terminals 3, 6, and 9 are at the same potential.
Note! For safety reasons the fault relay signals a "fault" when the ACS550 is
powered down.
You can wire the digital input terminals in either a PNP or NPN configuration.
PNP connection (source)
Communications
Terminals 28
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.
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.
Terminated
Station
X1
28 Screen
29 B
30 A
31 AGND
32 Screen
1
For functional descriptions, see
page 72
Installation
X1
10 +24V
11 GND
12 DCOM
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
32 are for RS485 modbus communications. Use shielded cables.
...
Station Station
Identification
RS485 Multidrop application
Other Modbus Devices
SCR
B
A
GND
B
A
GND
SCR
Application Macros
, and Standard Serial Communication
NPN connection (sink)
X1
Hardware Description
28 SCR
29 B
30 A
31 AGND
32 SCR
off position
on page 52 , Complete Parameter Descriptions
on page 150 .
10 +24V
11 GND
12 DCOM
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
Terminated
Station
1
RS485 interface
J2 J5 J2 J5
ON ON
ON ON
on position
Bus termination
on