Xylem IM167 R8 Aquavar CPC (Centrifugal Pump Control) - Manual (Page 31)

31
You can wire the digital input terminals in either a PNP or NPN configuration.
PNP Connection (Source) NPN Connection (Sink)
Communications
Terminals 28…32 are for RS485 or modbus communications. Use shielded cables. For lengths
of cable beyond 100 feet, use screen connections.
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.
1 For functional descriptions, see “Standard Serial Communication” addendum.
INSTALLATION
(Frames R1-R6)
X1
10 +24V
11 GND
12 DCOM
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
X1
10 +24V
11 GND
12 DCOM
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
Terminated
Station Station Station
Terminated
Station
X1 Identification
28 Screen
29 B
30 A
31 AGND
32 Screen
SCR
B
A
GND
B
A
GND
SCR
28 SCR
29 B
30 A
31 AGND
32 SCR
ON ON
ON ON
RS485 Multidrop Application
Other Modbus Devices
Hardware Description 1
RS485 Interface
J2 J5 J2 J5
off position on position
Bus Termination
RS485
Multipump
Connections