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2-1 System Configuration
PC Link Units are mounted to the PC Racks and connected to each other.
Each PC Link Unit contains a buffer through which data is transferred to and
from the other PC Link Units connected to it. The C500-LK009-V1 can be
used with C500, C1000H, and C2000H PCs, but not with a C200H, C200HS,
or C200HX/HG/HE(-Z) PC. The C200H-LK401 can be used with C200H,
C200HS, and C200HX/HG/HE(-Z) PCs.
Link Adaptors are used in any System other than one containing only two
PC Link Units connected with wire cable. They serve as branching points to
enable connecting more than two PC Link Units, which provide only one con-
nector each allowing only two PC Link Units to be connected directly, or they
serve as conversion points to change between wire and optical fiber
cables.The 3G2A9-AL001 Link Adapter is used as the Branching Link Adapt-
er (see Example 3, below), and combinations of the 3G2A9-AL004 and
3G2A9-AL002 Link Adapters are used to convert to and from optical fiber
cable.Refer to the Link Adapter Installation Guide for Link Adapter specifica-
tions and details.
Each PC Link Unit has only one connector, making it impossible to connect
more than two PC Link Units directly. Many more PCs can become part of
the same PC Link System however, if Branching Link Adapters are used to
connect through. A PC Link System including six PCs is illustrated below to
show this. This arrangement also protects PC Link communications from
shutting down completely for failures in the line, i.e., if communications are
broken off on a branch line, data transfer will continue to PCs still connected
though PC Link Units to the polling unit.
PC with PC
Link Unit
PC with PC
Link Unit
PC with PC
Link Unit
PC with PC
Link Unit
PC with PC
Link Unit
PC with PC
Link Unit
Link Adapters
Up to two PC Link Units can be mounted to one PC. Any PC with two PC
Link Units mounted to it or any PC part of a PC Link System that contains
such a PC is in a Multilevel PC Link System. If any one PC in the PC Link
System has two PC Link Units mounted to it, the entire System is multilevel.
Each group of PCs connected by PC Link Units and sharing parts of the LR
area are part of the same PC Link Subsystem. If a PC has two PC Link
Units mounted to it, it is part of two PC Link Subsystems, with each Subsys-
tem extending from a PC with two PC Link Units to either the end PC or the
next PC with two PC Link Units (see diagram below).
Each Subsystem will have its own polling unit. Each Subsystem is also as-
signed an operating level to differentiate the two Subsystems to which one
PC belongs. These operating levels do not imply a hierarchy or in anyway
affect operation of the Subsystems except to determine which LR words are
allocated to which Subsystem (see next subsection for details).
The following example conceptually shows a Multilevel PC Link System with
three Subsystems. Although Subsystems 1 and 3 are assigned the same
operating level, they are not related in any special way.
Multilink Systems
Multilevel Systems
System Configuration Section 2-1