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5Conformance to EC Directives
xiv
• Always discharge static electricity by touching a grounded metal part before
mounting the Serial Communications Board.
• Always discharge static electricity by touching a grounded metal part before
connecting cable connectors to RS-232C or RS-422A/485 port of the Serial
Communications Board.
• Be sure that the connectors, terminal blocks, expansion cables, and other
items with locking devices are properly locked into place. Improper locking
may result in malfunction.
• Confirm that no adverse effect will occur in the system before attempting any of
the following. Not doing so may result in an unexpected operation.
• Changing the operating mode of the PC.
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• Take appropriate measures to ensure that the specified power with the rated
voltage and frequency is supplied. Be particularly careful in places where the
power supply is unstable. An incorrect power supply may result in malfunction.
• Leave the label attached to the Unit when wiring. Removing the label may re-
sult in malfunction if foreign matter enters the Unit.
• Remove the label after the completion of wiring to ensure proper heat dissipa-
tion. Leaving the label attached may result in malfunction.
• Confirm polarities before connecting RS-422A/485 cables. Some devices re-
quire that SDA/B and RDA/B or signal polarities be reversed.
• Double-check all wiring and switch settings before turning ON the power sup-
ply. Incorrect wiring may result in burning.
• Check the user programming (ladder program, protocol macro data, etc.) for
proper execution before actually running it on the Unit. Not checking the pro-
gram may result in an unexpected operation.
• Resume operation only after transferring to the new CPU Unit the contents of
the DM Area, HR Area, and other data required for resuming operation. Not
doing so may result in an unexpected operation.
• Circuit boards have sharp or pointed edges, such as those on the leads of elec-
trical parts. Do not touch the back of printed boards or mounted sections with
your bare hands.
• Connect or set terminating resistance correctly when using RS-422A/485
cables.
• During transportation and storage, cover the circuit boards with conductive
materials to prevent them from being damaged by static electricity caused by
LSIs or ICs and keep them within the specified storage temperature.
• Refer to Section 2 Board Components and Installation and correctly wire and
install the Units.
• Do not attempt to take any Units apart, to repair any Units, or to modify any
Units in any way.
• Disconnect the functional ground terminal when performing withstand voltage
tests. Not disconnecting the functional ground terminal may result in burning.