VDO ACTUATORS - FOR CENTRAL LOCKING SYSTEMS V3.1 Manual de usuario descargar pdf (Pagina 7)

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Be Certain with BeldenBe Certain with Belden

Ethernet Connectors

RJ45 connectors are widely used for connecting

devices to Ethernet networks for ofce

communication. For these types of applications,

an IP 20 protection rating is required. For

applications in tough industrial environments

M12 connectors with IP 67 protection are widely

used. M12 connectors have proven to be a reliable

connecting method for sensors and actuators as

well as for use in transferring data.

Ethernet Data Lines

Originally, the Ethernet specication provided for

the use of coaxial cables as the transfer medium.

A distinction was made between thick coax

(10BASE-5) and thin coax (10BASE-2), depending

on the cable structure. Because of its low cost,

thin coax was commonly referred to as

“Cheaper net”.

Today, the use of twisted-pair cable (10BASE-T,

100 BASE-TX) is more common. This type of

cable represents a divergence from the original

mechanisms in a number of ways. In twisted-

pair cables, sending and receiving channels are

separated. The channels are then transferred over

a wire pair. The lines are organized according

to categories.

Within the industry, use of Fast Ethernet with a

data transfer rate of 100 Mbit/s is widespread. The

required cable must meet Category-5 standards.

To improve network expansion capability and

increase data transfer rates, ber-optic cables

are also used as transfer medium (10BASE-F,

100BASE-FX, and 1000BASEX).

Use of Hubs/Switches

If only two devices are used, the sending channel

of one device must be connected to the receiving

channel of the other device for twisted-

pair wiring. If more than two devices are to

communicate with one another, hubs or switches

are used as the central station. Usually, hubs and

switches have multiple ports to which terminals

or other hubs or switches can be connected to

allow network cascading. The difference between

a hub and a switch lies in the method used

to forward data packages. A hub sends a data

package it has received at one port to all

other ports.

A switch, on the other hand, evaluates the target

address of the data package and only forwards

the data package to the port leading to the device

that was intended as the recipient. By forwarding

data packages only to targeted recipients,

switches reduce the load on the network and

increase communication speed.

Topology

Using a switch or hub as the central element

produces wiring in the shape of a star, which, in

turn, serves as the basis for the network topology.

By using several switches it is possible to build a

tree-like structure.

Wire Length

The permitted wire length between one hub or

switch and a terminal or between two terminals

(channel) according to specications is 100 m for

twisted-pair wiring. Nevertheless, the network

expansion capability is greatly determined by the

wires and connectors that are used.

Data Transfer Rate

The data transfer rate for standard Ethernet

(10BASE-T) is 10 MBit/s. For Fast Ethernet

(100BASETX) it is 100 MBit/s.

Auto Negotiation

Today’s Ethernet devices support both standard

and Fast Ethernet data transfer. This ensures the

downward compatibility of the devices, so that

older devices can still be used to exchange data.

On the basis of the “auto negotiation” procedure

dened in Fast Ethernet, two devices agree upon

a common method of data transfer before the

exchange of data actually takes place (10 or 100

MBit/s, half or full duplex).

Auto Crossing

Implementing this function enables Ethernet

device interfaces to cross sending and receiving

wires automatically for twisted-pair wiring. This

makes it possible to use 1-to-1 wired lines instead

of crossed data lines when wiring the system.

Auto Polarity

Today’s Ethernet interfaces for 10BASE-T and

100BASE-TX are able to change the polarity of

both of the sending or receiving lines to correct

wiring errors.

Shielded (STP) and Un-Shielded

(UTP) Cables

The use of shielded cables is recommended for

environments with increased EMI levels. It is

important to ensure the proper grounding of the

shield to avoid ground loops that may lead to

interference of the data communication.

Today’s commonly used Ethernet cables for

ofce applications use a 4-pair construction. For

standard applications with transmission speeds

up to a 100 Mbit/s (100baseT) however only two

of the four pairs are used (one transmit and one

receive pair). The additional wires were intended

for future additions (e.g. higher transmission

speeds such as Gigabit Ethernet). 100 Mbit/s

are sufcient for the real-time demands on the

factory oor. Therefore many of the automation

specic protocols utilize the 2-pair technology.

M12 Circular Connectors, 8-Pole

The M12 8-pole connector is mostly used in

applications where standard Ethernet is brought

from the ofce to the factory oor (e.g. via

TCP/IP).

The cordsets meet the requirements for Category

5e according to the TIA/EIA 568B standard. The

continuous use of 4-pair cables makes it possible

to use all standard Ethernet cable testers that

might already be available in the IT department

(not all cable testers support 2-pair cables).

The unused wires can also be used for additional

functionalities like power over Ethernet or the

transmission of video signals.

M12 Circular Connectors, 4-Pole

Since this connector type uses only 2- pair

cables it is mostly used in automation specic

applications. It is standardized for EtherNet/IP and

PROFInet and is part of the IAONA specication.

The specied connector type utilizes the Dcoding.

This newly developed keyway helps avoid incorrect

connections (e.g. connecting an Ethernet cable to

a power supply) and possibly destroying

network equipment.

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