 |
|
 |
| |
|
|
| |
Is
the Industrial Ethernet an Open standard ? |
|
| |
|
|
| |
What
is different between an Ethernet switch and an Ethernet hub ? |
|
| |
|
|
| |
What
is different between unmanaged, Ring or managed solution ? |
|
| |
|
|
| |
Is
the Ring switch Managed or unmanaged ? |
|
| |
|
|
| |
How
many switches can I connect together on the same LAN ? |
|
| |
|
|
| |
|
|
| |
|
|
| |
Is
the Industrial Ethernet an Open standard ? |
|
| |
Since Industrial Ethernet is derivated from
office Ethernet, it is clearly an open standard. From the user’s
point of view, this common basis is the most obvious benefit. By
choosing Ethernet, users don’t have to worry about being restricted
by the product manufacturer’s own proprietary protocol structure.
Thus any IEEE 802.3 device with a standard 10/100BaseT(X) Ethernet
port can be easily connected to each other by just plugging them
into the same Ethernet LAN. In addition, Ethernet is already commonplace
in office environments, and offers many useful services, such as
e-mail, FTP, and web browsing, all well known to users. Applying
these services in an industrial control network gives users a head
start, since they do not need to spend a lot of time learning new
application programs. This also means that training costs can be
lowered, and development time can be speeded up, since system developers
are already familiar with the software that is readily available
for Ethernet applications. |
|
| |
Haut
de la page |
|
| |
|
|
| |
What
is different between an Ethernet switch and an Ethernet hub ? |
|
| |
The common Ethernet hub simply broadcasts each
message it receives to every one of its ports. Each Ethernet device
also has to wait for its turn to ‘talk’ to the hub, increasing
the probability of message collisions; therefore, real-time operation
is jeopardized and determinism is difficult. Alternatively, the RJ-Switch
automatically determines and remembers where an Ethernet device is
located and routes messages only through the appropriate port. This
minimizes network loading and enables true deterministic communications
over Ethernet. |
|
| |
Haut
de la page |
|
| |
|
|
| |
What
is different between unmanaged, Ring or managed solution ? |
|
| |
An unmanaged switch is a truly plug and play
device which does not require any configuration. Just plug in it,
connect the Ethernet cables from users such as personal computers
or I/O devices, and it will immediately communicate data between
users. The Ring switch has extended capabilities. It allow to connect
devices in a Ring topology. When a link is broken, the Ring switch
instantly transfers data to new path. This provide fast network and
avoid fault on the network. Managed switches can be configurated
to improve the network performance and control the traffic. They
may be configurated via a Telnet console or even a web browser. Different
management features are available. |
|
| |
Haut
de la page |
|
| |
|
|
| |
Is
the Ring switch Managed or unmanaged ? |
|
| |
The Ring models are semi-managed. They combines
the plug-and-play simplicity of an umanaged switch with some high
performance features of managed switches. Ring RJ-Switch can be pre-configurated
to just run. But it is also possible to fine tune the performance
of the ring by using a simple Windows wizard. |
|
| |
Haut
de la page |
|
| |
|
|
| |
How
many switches can I connect together on the same LAN ? |
|
| |
Switches can be cascaded almost without limit
because unlike a passive hub that has retransmission limitations,
an active switch regenerates Ethernet messages as if it were an original
transmission. There really is no limit as long as the total latency
is acceptable to your application. For example, the total latency
of 10 Ring RJ-Switches cascaded (connected in series) is typically
less than 50 us. |
|
| |
Haut de
la page |
|
| |
|
|
Is
the Industrial Ethernet an Open standard ?
Since Industrial Ethernet is derivated
from office Ethernet, it is clearly an open standard. From the
user’s point of view, this common basis is the most obvious
benefit. By choosing Ethernet, users don’t have to worry
about being restricted by the product manufacturer’s own
proprietary protocol structure. Thus any IEEE 802.3 device with
a standard 10/100BaseT(X) Ethernet port can be easily connected
to each other by just plugging them into the same Ethernet LAN.
In addition, Ethernet is already commonplace in office environments,
and offers many useful services, such as e-mail, FTP, and web
browsing, all well known to users. Applying these services in
an industrial control network gives users a head start, since
they do not need to spend a lot of time learning new application
programs. This also means that training costs can be lowered,
and development time can be speeded up, since system developers
are already familiar with the software that is readily available
for Ethernet applications. |
Fermer |
What
is different between an Ethernet switch and an Ethernet hub ?
The common Ethernet hub simply broadcasts
each message it receives to every one of its ports. Each Ethernet
device also has to wait for its turn to ‘talk’ to
the hub, increasing the probability of message collisions; therefore,
real-time operation is jeopardized and determinism is difficult.
Alternatively, the RJ-Switch automatically determines and remembers
where an Ethernet device is located and routes messages only
through the appropriate port. This minimizes network loading
and enables true deterministic communications over Ethernet. |
Fermer |
What
is different between unmanaged, Ring or managed solution ?
An unmanaged switch is a truly plug and
play device which does not require any configuration. Just plug
in it, connect the Ethernet cables from users such as personal
computers or I/O devices, and it will immediately communicate
data between users. The Ring switch has extended capabilities.
It allow to connect devices in a Ring topology. When a link is
broken, the Ring switch instantly transfers data to new path.
This provide fast network and avoid fault on the network. Managed
switches can be configurated to improve the network performance
and control the traffic. They may be configurated via a Telnet
console or even a web browser. Different management features
are available. |
Fermer |
Is
the Ring switch Managed or unmanaged ?
The Ring models are semi-managed. They
combines the plug-and-play simplicity of an umanaged switch with
some high performance features of managed switches. Ring RJ-Switch
can be pre-configurated to just run. But it is also possible
to fine tune the performance of the ring by using a simple Windows
wizard. |
Fermer |
How
many switches can I connect together on the same LAN ?
Switches can be cascaded almost without
limit because unlike a passive hub that has retransmission limitations,
an active switch regenerates Ethernet messages as if it were
an original transmission. There really is no limit as long as
the total latency is acceptable to your application. For example,
the total latency of 10 Ring RJ-Switches cascaded (connected
in series) is typically less than 50 us. |
Fermer |
|