Allen-Bradley 2755 Manual de usuario descargar pdf (Pagina 52)

Installing the Wiring Base and Power Supply 3–17

The wiring base has an RS-485/RS-422 terminal block for

point-to-point or network communications. Up to 32 devices can be

installed on a single DH485 network.

Important: The DH485 network cable requires proper shielding,

grounding, and termination. Refer to Data Highway /

Data Highway Plus / Data Highway DH485 Cable

Installation Manual (Publication No. 1770-6.2.2).

Network or Point-to-Point

Allen-Bradley offers a variety of devices that support RS-485 or

RS-422 communications. One of the more common RS-485 network

types is an SLC DH485 network.

SLC 5/04

Link Coupler

DH485 DH485

Reader Reader

Use the link coupler (Catalog No. 1747-AIC) when the distance

between the Reader and SLC is greater than 50 feet (15.2 meters).

The Reader can connect directly to another RS-485/RS-422 device.

The connections for both network and point-to-point are the same.

Line

Termination

TxA

TxB

RxA

RxB

Ground

Shield

RS-485/422

RS-422

Line Termination

The end devices on an RS-422/RS-485 network must be terminated.

A termination switch is provided. Only the end devices, on each

end of a network, should be terminated.

RS-485

d RS-422

Connections

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 95 96

Sin comentarios

Allen-Bradley 2755 Manual de usuario Pagina 52