Omron CS1W-CLK12-V1, Руководство по эксплуатации

Страница: 73 / 312

56
Optical Wiring Section 3-3
3. The maximum distance between nodes depends on how the cable is pro-
cessed. For details, refer to the applicable Optical Fiber Cable (H-PCF)
manual.
4. There are no special restrictions that apply to the distance between stand-
by Controller Link Units and higher or lower Controller Link Units. (The re-
strictions, however, on the maximum transmission distance for Controller
Link Networks (20 km) and the maximum distance between nodes (de-
pends on the cable construction method) must be satisfied.)
5. The standby Controller Link Unit does not participate in communications
and so is not counted as a node. However, because standby Units are in-
cluded in the figure for the maximum number of mountable Units (62), the
maximum number of active nodes is equal to the following:
62
−
Number of standby Units
6. The network can include a mixture of duplex and non-duplex nodes.
3-3-2 Optical Fiber Cable Connections for GI Cable
Optical Bus and Optical
Ring Systems (Token-bus
Mode) All of the nodes in the network are connected in a line (daisy-chain configura-
tion) with GI Optical Fiber Cable. The cables must be connected as shown in
the following diagrams.
An identifying label is printed on one of the cables in each pair, so that the
cables can be told apart. If the Units are connected incorrectly, the situation
can be misinterpreted as a disconnection and unpredictable operation may
result.
Although there is no fixed order in which the nodes must be connected, in
order to minimize the effect on communications time in the event of a discon-
nection, it is recommended that they be connected in node-address order
(node 1
→
node 2...
→
node 62) whenever possible.
Always cover the unused connectors on the highest and lowest nodes in the
network with Optical Connector Covers.
See 1-2-6 Devices Required for Connection for details on available GI Optical
Fiber Cables.
Note 1. Always use the specified Optical Fiber Cables.
2. Although the Optical Fiber Cables can be distinguished by the markings or
color, in order to prevent incorrect connection it is recommended that tags
are attached to the cables.
3. The maximum distance between nodes depends on the type of GI cable
(core diameter) that is being used.
62.5/125
µ
m cable: Max. distance between nodes = 2 km
50/125
µ
m cable: Max. distance between nodes = 1 km
Higher SL2 "Receive"
Higher SL2 "Transmit" Lower SL1 "Receive"
Lower SL1 "Transmit"
←
Higher Lower
→
Optical
Connector
Cover
Receive
Transmit
Receive
Transmit
Receive
Transmit
Receive
Transmit
Optical
Connector
Cover