103643 datasheet(4/24 Pages) ETC2

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Catalog E 074441

01/06

Edition 4

www.erni.com

General Information

The development of bus systems for industrial applications

began in 1983. To be more accurate, it was the use of serial

data transmission which brought about the breakthrough. In

1988, field bus systems were still new in industrial automati-

on and a great deal of effort was required to win customers.

But within a very short time, so-called field bus systems

have gained acceptance to an extent that no one could have

dreamed of.

This has only been possible because customers have simply

been made aware of a clear product advantage. From then

on, it was no longer necessary to individually wire device for

device and signal for signal; instead so-called “bus nodes”

could be installed, which communicate with one another by

means of a 2-wire cable and pass on commands to the input

and output modules. In this way, installation expense and

the possibility of faults were considerably reduced. Added

to this are features such as remote diagnostics, parameter

setting and modularity, to name but a few. Of the multitude

of field buses that came onto the market, some have almost

disappeared again. The large control system manufactu-

rers are trying to establish their systems in the marketplace

through so-called user organizations, e.g. PNO (Profibus

User Organization), CiA (CAN in Automation), SafetyBUS p

(SafetyBUS Club), and other marketing activities.

A fundamental difference is constituted by the different net-

work topologies. Hence, there are line, ring or star configura-

tions. All have their particular advantages and disadvantages.

Device hierarchies are also possible: master-slave systems or

multi-master systems.

A characteristic of the line configuration is that the bus must

be “terminated” by means of a resistor at the end of the line

in order to avoid effects such as reflections, which may inter-

fere with the communication.

Devices within the line are cabled by “looping through”. Here,

the T function, which enables the bus to operate when the

plug is removed, is of particular interest.

ERNI is currently concentrating on Profibus, CAN bus and

SafetyBus p versions where, at the same time, customer-

specific solutions e.g. for Bitbus, Interbus, etc. also exist.

In the meantime, some bus systems have been international-

ly standardized. The so-called physical layer is also defined

in these standards, which, among other things, specify the

cable, the connectors and the contact assignment. There are

still differences with regard to the protection class. Different

plug connectors are recommended depending on this. The

term “light duty” is used with IP 20 and “heavy duty” with IP

65/67.

ERNI bus interface connector,

ERbic for short

The interface plugs of the ERbic line for various bus systems

offer different features and advantages. They are based on

D-Sub interface technology. All ERbics have compact exter-

nal dimensions. There are versions with horizontal and vertical

cable outlets.

Both pure node versions and pure termination versions are

available as well as nodes with a connectable termination

resistor. The node (without termination resistors) is used

within the length of a line and the termination (with terminati-

on resistors) at the end of the line. The node with a connec-

table termination resistor can be used anywhere. The latter is

simply configured as a termination by changing the position

of the switch.

The housings of the pure terminations are a different color

than the nodes. The end of the line is therefore immediately

recognizable.

The bus systems are also different colors. The user can the-

refore easily find their way around within a system.

A T function is provided in all ERbics. A device can therefore

be changed while the bus is running. The types with a con-

nectable termination resistor are primarily suitable for custo-

mers with reduced storage or when setting up, extending or

converting large systems.

Certain types are reversed with regard to the face of the con-

nector, allowing the direction of the cable outlet to be deter-

mined. This is achieved by a special pin arrangement in the

D-Sub connector.

However, the standard direction of the cable outlet is mat-

ched to the devices of the market leaders and should there-

fore be used for new designs.

A further outstanding feature is the termination technology.

Depending upon the type, ERbics are available with screw

terminals, cage-clamp terminals or IDC terminals.

Terminations using the Siemens FastConnect principle, for

example, are therefore possible.

The development of field buses in the direction of safety-

related applications is also satisfied by corresponding further

advancement of the ERbic line. There is a Profibus Ex i versi-

on, which was developed together with ABB, or a SafetyBus

p version for the Pilz company.

As an alternative to the plastic housing, the newly developed

ERbic MAX has recently been introduced to the market. This

has a metal housing and an axial cable outlet. It is particularly

suitable for harsh environments and offers space advantages

at the field device when several interfaces are present.

The metal housing guarantees optimum EMC.

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