Siemens SIMATIC TI500 Especificaciones Pagina 189

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Cabling and Wiring the System
6-24
SIMATIC 545/555/575 System Manual
Installing PROFIBUS-DP I/O Cables (continued)
The device at each extreme end of a PROFIBUS-DP cable must be
terminated and biased; any connections made between extreme cable ends
must not be terminated or biased. See the examples below.
If a CPU with PROFIBUS-DP interface is located at an extreme end of the
cable, it must be terminated and biased. The device at the other end of the
cable must be terminated and biased. See Figure 6-12.
=PROFIBUS-DP Node
Termination and bias required.
Cable end must be
terminated and biased.
N
N
NN N
CPU with
PROFIBUS-DP
I/O interface
Figure 6-12 Terminate CPU at Endpoint
If the CPU with PROFIBUS-DP interface is not at an extreme end of the
cable, do not terminate and bias it. Only terminate and bias the devices at
each cable end. See Figure 6-13.
=PROFIBUS-DP Node
Do not terminate and bias.
Cable end must be
terminated and biased.
Cable end must be
terminated and biased.
N
N
CPU with
PROFIBUS-DP
I/O interface
NN
N
N
N
Figure 6-13 Do Not Terminate at Midpoint
Termination and
Bias
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