Yaskawa MEMOCON GL120 - Manual (Page 436)

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5.3 Panel Wiring
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3. Precautions When Hot Swapping
Heed the following precautions when hot swapping (removal/insertion under power).
WARNING When installing or removing an AC/IO Module while the AC power supply is turned ON, install
a safety switch for each Module and always turn this safety switch OFF to turn OFF to cut off
AC power supply.
Installing or removing an AC/IO Module while AC power is being supplied may result in an
electrical shock at touching the power supply terminals.
1) Inserting or removing a Module which does not permit live mounting and removal may
cause the CPU Module to stop.
2) Heed the following precautions when performing hot swapping on an I/O Module which is
being supplied AC power as I/O power supply.
3) When hot swapping on an I/O Module which supply DC power as I/O power supply, there
is no need to setup safety switches. However, it may cause I/O signal chatter when insert-
ing or removing a terminal block or a connector to or from the Module. If this is a problem,
then setup a chatter prevention switch for each Module and make sure to turn this switch
OFF to cut off DC power supply.
4) When hot swapping on a Uniwire Interface Module which is being supplied DC power as
I/O power supply, install a safety switch for each Module and make sure to switch OFF
this switch to cut off DC power supply. Inserting or removing the Module while DC power
is being supplied may result in short-circuits when removing or attaching the power sup-
ply cable.
5) When hot swapping, never short-circuit the terminal block or the connectors of the Mod-
ule.
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