Terminate the network, Terminate at the adapter using line a, Terminate at the adapter using line b – Rockwell Automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User Manual User Manual
Page 91
3–5
Connect the Adapter to the PROFIBUS DP Network
Publication 1794ĆUM057B-EN-P - November 2001
3. Insert the wired connector into the mating connector on the
PROFIBUS adapter.
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.
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
+ 5V
6
3
8
5
390
Ω
(2%,
1/4W)
390
Ω
(2%,
1/4W)
CABLE
Signal +
Signal -
Data Ground
220
Ω
(2%,
1/4W)
5
.
.
1
9
6
.
.
Terminate at the Adapter Using Line B
Use the following termination resistors with line B:
PROFIBUS DP ADAPTER
+ 5V
6
3
8
5
390
Ω
(2%,
1/4W)
390
Ω
(2%,
1/4W)
CABLE
Signal +
Signal -
Data Ground
150
Ω
(2%,
1/4W)
5
.
.
1
9
6
.
.
Terminate the Network