Honeywell ControlEdge 900 platform Hardware Planning And Installation Manual page 156

156
CAUTION: Most of the modules available for use in the
ControlEdge PLC have an REMOVAL AND INSERTION UNDER
POWER designation. That is, they can be Removed and Inserted
Under Power, where "power" refers to DC power at the backplane
of the rack. (It does not refer to power for field wiring at the
terminal board associated with the I/O module, which must be
disconnected (using a user-supplied switch) at the field device
before removing or inserting the module.
For all other components of the system, AC power to the system must
be removed before removal or replacement of the component.
CAUTION: Hazardous voltages exist at the Power Supply and at
the terminal boards on I/O Modules:
Only trained and authorized personnel should perform the
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procedures in this section.
Disconnect all sources of power associated with these
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components before removal or insertion.
Failure to comply with these instructions could result in death
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or serious injury.
EXPLOSION HAZARD Class I, Division 2/Zone 2 Installations
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SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY
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FOR CLASS I, DIVISION 2/ZONE 2.
EXPLOSION HAZARD Class I, Division 2/Zone 2 Installations
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DO NOT DISCONNECT EQUIPMENT UNLESS POWER HAS
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BEEN SWITCHED OFF OR THE AREA IS KNOWN NOT TO BE
HAZARDOUS.
CAUTION: Hazardous voltages exist at the Power Supply and at
the terminal boards on I/O Modules:
Only trained and authorized personnel should perform the
l
procedures in this section.
Disconnect all sources of power associated with these
l
components before removal or insertion.
Failure to comply with these instructions could result in death
l
or serious injury.
EXPLOSION HAZARD Class I, Division 2/Zone 2 Installations
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