Rockwell-automation 1747-DSN DISTRIBUTED I/O SCANNER Manual do Utilizador descarregar pdf (Página 16)

Chapter 2

Wiring and Installation

2–4

The DH–485 Data Link allows a programming device to communicate with

the SLC processor. Each I/O block has a programming port that allows a

programming device to be connected to the DH–485 Data Link.

The Isolated Coupler and I/O blocks are connected to the DH–485 Data Link

in a daisy chain configuration. A daisy chain configuration is formed by

connecting the Isolated Coupler and I/O blocks together in a serial manner

along a single section of link cable (Belden 9842).

There are no restrictions governing the spacing between each device, as long

as the overall length of the DH–485 Data Link does not exceed 4,000 feet.

However, no two devices may be connected to the same point on the

DH–485 Data Link. Termination must be provided at each end of the link.

The I/O blocks and Isolated Couplers have internal resistors for this purpose.

Incorrect

Correct

Last device must

be terminated

Incorrect

Correct

Isolated Link

Coupler

Last device must

be terminated

Last device must be

terminated

Last device must

be terminated

Last device must be

terminated

Last device must be

terminated

1747–C11

Communication

Cable

Programming

Device (APS)

Programming

Device (HHT)

Belden 9842

Last device

terminated

1747–C10

Communication

Cable

Last device

terminated

Important: The device at each end of the link must be terminated using the

DH–485 Termination Switch (switch 10).

Wiring the DH–485 Data

Link

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 39 40

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