Omron SYSMAC 3G8F7-CLK13-E Operation Manual page 27

Overview
Transmission Path
Duplication
Disconnect Detection and
Notification
Node Connection
Configuration Data
Reading
Using Repeater Units for T-Branches, Network Extensions, Network Expansions,
Converting Network Sections to Optical Fiber, and Device Modularization
T-Branches enable greater wiring freedom during layout, restructuring, and expansion of
networks.
The total length of wired networks can be extended.
The maximum number of nodes can be extended to 62 for wired networks.
Improved noise resistance through the use of optical cabling.
Devices can be modularized.
In Token Ring Mode in an Optical Ring System (H-PCF cable or GI cable),
data transmission will be unaffected even by a cable or connector break at
one location in the ring connection. With the optical cable wired in a ring
shape, a break at one point will simply cause the transmission to be routed on
the other path.
Even with transmission path duplication, the network will be broken if discon-
nections occur in two or more places. In Token Ring Mode in an Optical Ring
System (H-PCF cable or GI cable), the location of a disconnection can be
detected and identified by means of the node status information given for all
nodes. This function can be used to prevent system crashes in advance, e.g.,
by performing maintenance when a disconnection occurs at one location.
In Token Ring Mode in an Optical Ring System (H-PCF cable or GI cable),
connection data can be read for all of the nodes in the network. The informa-
tion that can be read includes the order in which the nodes are connected and
which of two optical connectors is connected to which node. Special support
software (Controller Link Support Software, Ver. 2.00 or later) is required to
read the node connection configuration data.
Wire-to-Wire Repeater Units enable Controller Link T-Branches. T-Branches
provide the following advantages:
• Cabling can conform to the layout of equipment.
• It is possible to add nodes by adding or inserting Repeater Units at
branch points of an existing wired Controller Link system.
• If Repeater Units are installed at likely future branch points in the network
in advance, new nodes can be added by simply connecting them to these
Repeater Units.
At a baud rate of 2 Mbps, conventional wired networks can be up to 500 m
long. By using two Repeater Units, this can be extended to a maximum of
1.5 km.
By combining version-1 Controller Link Units/Support Boards and a Repeater
Unit, it is possible to construct networks containing up to 62 nodes.
By installing two Wire-to-Optical Repeater Units, optical cabling can be used
for sections of the network that are the source of noise.
• Devices can be modularized according to Repeater Units, making wiring
easier when adding, removing, or modifying devices.
• When starting up devices, components can be added to the network and
debugged as they are completed.
Refer to the Controller Link Unit Operation Manual (W309) for information on
using Repeater Units.
Section 1-1
7