Terminate the network, Terminate at the adapter using line a, Terminate at the adapter using line b – ProSoft Technology 3170-PDP User Manual
Page 49: Terminate, Network, 5 terminate the network, 1 terminate at the adapter using line a, 2 terminate at the adapter using line b
Connect the Adapter to the PROFIBUS DP Network
3170-PDP ♦ FLEX Platform
FLEX I/O™ PROFIBUS Adapter
ProSoft Technology, Inc.
Page 49 of 152
August 23, 2007
3
Insert the wired connector into the mating connector on the PROFIBUS
adapter.
RTS (Pin 4) Optional pin. Not used in a standard RS455 PROFIBUS – DP
installation.
4.5 Terminate
the
Network
You must use termination blocks only if your devices on the end of the network
do not have built-in terminating resistors.
Terminate the PROFIBUS media (trunk cable) at both ends of the network. If you
are not using a connector with built-in resistors, terminate the cable at the
adapter connector as shown below.
4.5.1 Terminate at the Adapter Using Line A
Since Line A has a higher line impedance, you must use the following termination
resistors:
PROFIBUS DP ADAPTER
+ 5 V
6
3
8
5
390 W (2%, 1/4 W)
390 W (2%, 1/4 W)
CABLE
Signal +
Signal -
Data Ground
220 W (2%, 1/4 W)
5
.
.
1
9
6
.
.
4.5.2 Terminate at the Adapter Using Line B
Use the following termination resistors with line B:
PROFIBUS DP ADAPTER
+ 5 V
6
3
8
5
390 W (2%, 1/4 W)
390 W (2%, 1/4 W)
CABLE
Signal +
Signal -
Data Ground
150 W (2%, 1/4 W)
5
.
.
1
9
6
.
.