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xiv
Application Precautions 5
The operating environment of the PC System can have a large effect on the
longevity and reliability of the system. Improper operating environments can
lead to malfunction, failure, and other unforeseeable problems with the PC
System. Be sure that the operating environment is within the specified condi-
tions at installation and remains within the specified conditions during the life
of the system.
5 Application Precautions
Observe the following precautions when using the DeviceNet Unit.
Failure to abide by the following precautions could lead to serious or possibly
fatal injury. Always heed these precautions.
• Always connect to a class-3 ground (100
Ω or less) when installing the
Units.
Failure to abide by the following precautions could lead to faulty operation or
the PC or the system or could damage the PC or PC Units. Always heed
these precautions.
• Install double safety mechanisms to ensure safety against incorrect sig-
nals that may be produced by broken signal lines or momentary power
interruptions.
• Enable the scan list to before operating the system.
• When adding a new node to the network, make sure that the baud rate is
the same as other nodes.
• Use specified communications cables.
• Do not extend connection distances beyond the ranges given in the spec-
ifications.
• Always turn OFF the power supply to the personal computer, Slaves, and
Communications Units before attempting any of the following.
• Mounting or dismounting the DeviceNet Unit, Power Supply Units, I/O
Units, CPU Units, or any other Units.
• Assembling a Unit.
• Setting DIP switches or rotary switches.
• Connecting or wiring the cables.
• Connecting or disconnecting connectors.
• Be sure that the terminal blocks, connectors, Memory Units, expansion
cables, and other items with locking devices are properly locked into
place. Improper locking may result in malfunction.
• Be sure that all the mounting screws, terminal screws, Unit mounting
screws, and cable connector screws are tightened to the torque specified
in the relevant manuals. Incorrect tightening torque may result in malfunc-
tion.
• Leave the label attached to the Unit when wiring. Removing the label may
result in malfunction if foreign matter enters the Unit.
• Remove the label after the completion of wiring to ensure proper heat dis-
sipation. Leaving the label attached may result in malfunction.
• Always use the power supply voltage specified in this manual.