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6 MAINTENANCE
⑩ Turn on the power supply of the controller unit and check that the add-on SD.LINK
module is running normally. To accomplish this check, ensure that the add-on SD.LINK
module's PR-/SR-RX and PR-/SR-TX LEDs are all lit, but its ERR LED is not.
Switch off modules before replacing them to avoid electrical shock hazards.
When replacing modules, do not touch any terminals other than those of
optical modules to avoid electrical shock hazards.
Replace modules one at a time. If optical fiber cables are disconnected at
multiple points and the same time, communication might be disabled.
Before replacing optical modules receptacle, check that the optical fiber cables
are not broken. Disconnecting optical fiber cables for replacement while they
are broken could disable communication.
A breakage is detected in the RAS table while replacement work is in
progress. If an optical fiber cable is disconnected for replacement, a
breakage is detected in the RAS table, but successful communication is
carried on.
CAUTION
NOTICE
6-8
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