Rockwell-automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User M Manual do Utilizador descarregar pdf (Página 91)

3–5Connect the Adapter to the PROFIBUS DP Network

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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:

  

+ 5V 6

3

8

5

390Ω (2%,  1/4W)

390Ω (2%,  1/4W)

CABLE

Signal +

Signal -

Data Ground

220Ω (2%,  1/4W)

5

.

.

1

9

6

.

.

Terminate at the Adapter Using Line B

Use the following termination resistors with line B:

  

+ 5V 6

3

8

5

390Ω (2%,  1/4W)

390Ω (2%,  1/4W)

CABLE

Signal +

Signal -

Data Ground

150Ω (2%,  1/4W)

5

.

.

1

9

6

.

.

Terminate the Network

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