Omron CS1G/H-CPUxxH Instructions Manual page 14

Application Precautions
!WARNING
!Caution Failure to abide by the following precautions could lead to faulty operation of
• The DeviceNet (CompoBus/D) output area for a DeviceNet (Compo-
Bus/D) Master Unit (CIO 0050 to CIO 0099) overlaps with the I/O bit
area (CIO 0000 to CIO 0319). Do not use automatic allocations for I/O
in any system where allocations to the DeviceNet system will overlap
with allocations to I/O Units. Instead, use a Programming Device or the
CX-Programmer to manually allocate I/O for the DeviceNet devices,
being sure that the same words and bits are not allocated more than
once, and transfer the resulting I/O table to the CPU Unit. If DeviceNet
communications are attempted when the same bits are allocated to
both DeviceNet devices and I/O Units (which can occur even if auto-
matic allocation is used), the DeviceNet devices and I/O Units may
both exhibit faulty operation.
• Special bits and flags for PLC Link Units (CIO 0247 to CIO 0250) over-
lap with the I/O bit area (CIO 0000 to CIO 0319). Do not use automatic
allocations for I/O in any system where allocations to the I/O Units will
overlap with allocations to I/O Units. Instead, use a Programming De-
vice or the CX-Programmer to manually allocate I/O to I/O Units, being
sure that the special bits and flags for PLC Link Units are not used, and
transfer the resulting I/O table to the CPU Unit. If operation is attempt-
ed when the special bits and flags for PLC Link Units are also allocated
to I/O Units (which can occur even if automatic allocation is used), the
PLC Link Units and I/O Units may both exhibit faulty operation.
Always heed these precautions. Failure to abide by the following precautions
could lead to serious or possibly fatal injury.
• Always connect to a ground of 100 Ω or less when installing the Units. Not
connecting to a ground of 100 Ω or less may result in electric shock.
• A ground of 100 Ω or less must be installed when shorting the GR and LG
terminals on the Power Supply Unit.
• Always turn OFF the power supply to the PLC before attempting any of
the following. Not turning OFF the power supply may result in malfunction
or electric shock.
• Mounting or dismounting Power Supply Units, I/O Units, CPU Units, In-
ner Boards, or any other Units.
• Assembling the Units.
• Setting DIP switches or rotary switches.
• Connecting cables or wiring the system.
• Connecting or disconnecting the connectors.
the PLC or the system, or could damage the PLC or PLC Units. Always heed
these precautions.
• The user program and parameter area data in the CS1-H, CS1D, CJ1-H,
and CJ1M CPU Units are backed up in the built-in flash memory. The
BKUP indicator will light on the front of the CPU Unit when the backup
operation is in progress. Do not turn OFF the power supply to the CPU
Unit when the BKUP indicator is lit. The data will not be backed up if
power is turned OFF.
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