Omron CX-Process Monitor Plus 2, Operation Manual

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Safety Precautions 3
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 Terminal 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 PC system may act unexpectedly and cause
injury.
!WARNING
Check the following items before starting to run the Loop Control Board:
• Do not allow the bank of the EM Area with the number specified for alloca-
tion to the HMI (human-machine interface) data to be used by the CPU
Unit or other Units for any other purpose. The bank allocated for the HMI
is specified in ITEM 050 (EM Area Bank Allocated for HMI Memory = 0 to
12) of the System Common block. If the same memory area is used for
more than one purpose, the system may operate in an unexpected fash-
ion, which may result in injury.
• Do not allow the area to which user link table data is written to be used by
the CPU Unit or other Units for any other purpose. If the same memory
area is used for more than one purpose, the system may operate in an
unexpected fashion, which may result in injury.
• Analog Input/Output Units used in combination with the Loop Control
Board must be mounted correctly, and the unit number set on the front
panel of the Analog Input/Output Unit must match the unit number set on
the Field Terminal block. If the unit numbers do not match, input/output
(read/write) will be performed on the data of another Special I/O Unit (i.e.,
the one whose unit number is set on the Field Terminal block).
• The defaults of the System Common block on the Loop Control Board
must be set correctly.
!WARNING
Always stop the operation of the Loop Control Board before converting any of
the EM Area to file memory. If any part of the EM Area that is being used by
the Loop Control Board for the HMI is converted to file memory during Board
operation, the system may operate in an unexpected fashion, which may
result in injury.
!WARNING
Do not perform processing in such a way that the Loop Control Unit/Board
and CPU Unit write to identical I/O memory words allocated to a contact out-
put or analog output of an external Unit. If the same words are written to, the
externally connected loads may act unexpectedly and cause injury.
!WARNING
Fail-safe measures must be taken by the customer to ensure safety in the
event of incorrect, missing, or abnormal signals caused by broken signal lines,
momentary power interruptions, or other causes.
!Caution Before transferring function block data (initial setting data or operation data) to
the Loop Control Unit/Board, confirm that the destination for the data is cor-
rect and also confirm the overall safety of the system (including the Loop Con-
trol Unit/Board). Not doing so may result in unexpected operation.