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4Safety Precautions
xii
1 Intended Audience
This manual is intended for the following personnel, who must also have knowl-
edge of electrical systems (an electrical engineer or the equivalent) and knowl-
edge about instrumentation system.
•Personnel in charge of installing FA systems.
•Personnel in charge of designing FA systems.
•Personnel in charge of managing FA systems and facilities.
2 General Precautions
The user must operate the product according to the performance specifications
described in the operation manuals.
Before using the product under conditions which are not described in the manual
or applying the product to nuclear control systems, railroad systems, aviation
systems, vehicles, combustion systems, medical equipment, amusement ma-
chines, safety equipment, petrochemical plants, and other systems, machines,
and equipment that may have a serious influence on lives and property if used
improperly, consult your OMRON representative.
Make sure that the ratings and performance characteristics of the product are
sufficient for the systems, machines, and equipment, and be sure to provide the
systems, machines, and equipment with double safety mechanisms.
This manual provides information for programming and operating the Unit. Be
sure to read this manual before attempting to use the Unit and keep this manual
close at hand for reference during operation.
WARNING It is extremely important that a PLC and all PLC Units be used for the specified
purpose and under the specified conditions, especially in applications that can
directly or indirectly affect human life. You must consult with your OMRON
representative before applying a PLC System to the above-mentioned
applications.
3 Safety Precautions
WARNING Check the following items before starting Loop Control Unit operation:
Analog I/O Units used in combination with the Loop Control Unit must be
mounted correctly, and the unit number set on the front panel of the Analog I/O
Unit must be the same as the unit number set on the Field Terminal Function
Block. If the unit numbers are not the same, I/O (read/write) will be performed on
the data for another Special I/O Unit (i.e., the one whose unit number is set in the
Field Terminal Function Block).
The initial settings of the System Common Block on the Loop Control Unit must
be set correctly. In particular, make sure that the Data Memory for the Node Ter-
minals in the CPU Unit controlling the Loop Control Unit is not used for other ap-
plications on the PLC. If the same words in Data Memory are used for more than
one application, the PLC system may act unexpectedly and cause injury.
When writing data to the I/O memory in the CPU Unit with function blocks (e.g.,
using Send All Blocks, Expanded DO/AO Terminal to CPU Unit, or DO/AO Ter-
minal to CPU Unit), be sure that the words written to in the I/O memory are not
being used for any other purpose. If I/O memory words are allocated to more
than one purpose, the PLC system may act unexpectedly and cause injury.
WARNING Do not perform processing in such a way that the Loop Control Unit and CPU
Unit write to identical I/O memory words allocated to a contact output or analog
output of an external Unit. If the same words are written to, the externally
connected loads may act unexpectedly and cause injury.