Communications - ABB ACS550-01 User Manual

22
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
29
30
31
32
1
For functional descriptions, see "Application Macros" on page 31, "Complete Parameter Descriptions"
on page 50, and communication protocol documentation.
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
Screen
RS485 Multidrop application
Other Modbus Devices
B
SCR
A
B
A
AGND
GND
Screen
B
A
GND
SCR
ACS550 User's Manual
NPN connection (sink)
X1
Terminated
Station
1
Hardware Description
J2
28 SCR
29 B
30 A
ON
31 AGND
32 SCR
off position
10 +24V
11 GND
12 DCOM
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
RS485 interface
J5 J2 J5
ON ON
ON
on position
Bus termination