Emerson USB Fieldbus Interface Manual de usuario descargar pdf (Pagina 13)

Networking

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1-800-893-2321

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CTNet Fieldbus

The CTNet fieldbus is a 5 Mbit token ring network

that supports peer-to-peer communications. Utilizing

the field-proven ANSI/ATA 878.1 ARCNET standard as

a foundation, CTNet includes a custom protocol stack

that supports cyclic data and “one shot” transactions.

The CTNet fieldbus employs an RS485 transformer-

isolated physical layer to allow usage of a convenient

and inexpensive two-wire shielded, non-phasic cable.

Two methods of data exchange are supported: cyclic

data and non-cyclic data. Cyclic data exchanges are

pre-programmed block transfers (20 registers max.)

between coprocessors at either a fast or slow rate. Non-

cyclic exchanges are asynchronous transfers initiated by

application programs or SCADA / HMI devices.

X-Link Network Bridge (2510-00010)

For those applications

requiring connection of

CTNet systems with third-

party networks and PLCs,

the X-Link Bridge provides

a solution. The X-Link

engine accepts a CTNet

ISA card and a third-party

network card, such as A-B Data Highway™. Special

driver software allows communication between the

two networks. Users may map registers on a PLC

to parameters in a CTNet-equipped drive and once

specified, the exchanges run continuously using the X-

Link box as the mediator. The X-Link currently supports

over 50 industrial networks and is the only system

available that can connect to an A-B Data Highway.

Repeaters

For extending CTNet cable segments

and creating star topologies, there are

three types of repeaters available:

CTNet Cable

Control Techniques

supplies a high quality

shielded twisted-pair cable

suitable for high-speed data

transmission. It is available

in three standard lengths or

any specified non-standard

length.

100 Meters CTNet-100

200 Meters CTNet-200

Non-standard (bulk in feet) CTNet-xxx*

* xxx= number of feet

Beckhoff Remote I/O

The high-quality Beckhoff

I/O system is available for

CTNet systems. Beckhoff

systems for CTNet include

a SSP7200-Rev C bus coupler

and a large variety of snap-on

terminal blocks allowing up

to 256 digital inputs or outputs and up to 100 analog

inputs and outputs per bus coupler. Up to 64 Beckhoff

I/O systems can be attached to a CTNet network. I/O

points exist as CTNet parameters and can be easily read

or written. Cyclic data transfers are also supported for

efficient I/O sampling.

Contact Control Techniques for details on the wide

range of available Beckhoff Remote I/O options.

CTIU200 Operator Interface Unit

Control Techniques

supports several HMI

displays, and of these the

CTIU200 model, with the

CTIU200-CTNet-Rev C option,

supports CTNet operations.

The CTIU200 is a high-end

operator interface unit featuring a 16-line,

40-character display, 37 keys, 300 pages of user-

programmable displays, a scripting language, graphical

charts and trends, recipe support and user-friendly

modification of parameter values. A sophisticated

Windows programming tool creates the custom

application and downloads it into the CTIU200

for operation.

Cable Length Catalog Number

Two-output (3-port) Repeater (Hub) CTNet-Hub-Rev D

Twisted-pair to Fiber Optic Repeater CTNet FIB-Rev D

Hybrid Hub for connecting

previous versions of CTNet CTNet Hybrid Hub

hardware to current versions

Description Catalog Number

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 22 23

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