Allen-Bradley PowerFlex 20-COMM-P FRN 1 Series User Manual page 18

2-4 Installing the Adapter
Figure 2.4 20-COMM-P DB-9 pin layout
Terminal
Housing
1
2
3
4
5
6
7
8
9
5. Connect the PROFIBUS cable to the adapter, and secure it with the
two screws on the connector. (See
Note: The screws on some connectors tie the Profibus cable ground/
shield to the metal of the socket. In some cases, Profibus will not
operate correctly without this connector.
Termination
The first and last node on the PROFIBUS network needs to be
terminated by using a PROFIBUS connector with terminating resistors.
Some connector manufacturers offer standard terminating connectors,
such as the yellow ERNI Profibus termination vertical connector (Part #
103659). Standard Profibus node connectors, such as the Phoenix
Subcon Plus M1 (Part #2761826), can be configured as a terminating
connector by adding resistors (See
Figure 2.5 Phoenix Subcon Plus M1 connection for terminating resistors
Signal
Shield
Not connected
Not connected
B-LINE
RTS
GND BUS
+5V BUS
Not connected
A-LINE
Not connected
6
390
Ω
3
220
Ω
8
390
Ω
5
Function
Positive RxD/TxD, according
to RS485 specification
Request to send
Isolated GND from bus
Isolated +5V from bus
Negative RxD/TxD
according to RS485
specification
Figure 2.6.)
Figure 2.5.)
B
A