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Link Adapters
1-1
Nomenclature
1-2
Link Adapters
2
Names of specific OMRON products, as well as generic names for groups of
OMRON products, are capitalized in this manual. Unit is also capitalized when it
refers either specifically or generically to an OMRON product. For convenience,
prefixes are omitted from model numbers of Link Adapters and Repeater Units.
"(P)" in a model number indicates two Units, one with the P and one without. See
the Appendix for a complete list of all products covered in this manual, along with
their full model numbers. In addition, abbreviations are used for certain Units. In
this manual, PC always means Programmable Controller; Master means Re-
mote I/O Master Unit; and Slave means Remote I/O Slave Unit.
Link Adapters are used to interconnect system devices such as host computers,
PC Link Units, Host Link Units, and Remote I/O Units, and/or to convert between
wire cable and optical fiber cable.
Using optical links between Units provides greater transmission distance and
noise resistance. In addition, Link Adapters provide inputs to bypass a Unit
which is improperly connected or which suffers a power interruption, thereby al-
lowing other Units connected in series to continue operating normally.
Some Link Adapters can ensure that a System will not begin operating until, for
example, a particular Subsystem has started up.
There are various models of Link Adapters to perform a variety of functions. For
example, the Link Adapter generally used for connecting PC Link Systems is the
AL001, but when optical cable is used it is replaced by combinations of the
AL002-(P)E and AL004-(P)E.
Link Adapter AL002-(P)E is used to branch optical cables; the AL004-(P)E is
used to convert between optical and wire cables; and the AL005-(P)E and
AL006-(P)E are used for branching and/or converting between different types of
optical fiber cables. Link Adapter AL007-P is used exclusively in Wired Remote
I/O Systems.
Link Adapters AL002-(P)E, AL005-(P)E, and AL006-(P)E have auxiliary power
input terminals which can be connected to a battery to ensure continued opera-
tion even when the AC power supply is cut off. (See 2-5 Backup Power Supply .)
Link Adapters AL002-(P)E and AL006-(P)E have repeater input terminals. (See
2-6 Link Adapter Repeater Input .)
The following diagram illustrates how Link Adapters can be used to connect sev-
eral Units in a simple configuration.
Link
Adapter
Rack with
linkable Unit
Link
Link
Adapter
Adapter
Rack with
Rack with
linkable Unit
linkable Unit
Section
1-2
Rack with
linkable Unit
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