Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual - Manual (Page 99)

Publication 1797-6.5.6 - June 2005
ControlNet Ex System 21-5
WARNING: Substitution of components may impair intrinsic safety.
AVERTISSEMENT: La substitution de composant peut compromettre la
securite intrinseque.
If fiber optic cable is provided with a metal shield, it must be connected to
a dedicated intrinsic safety ground in the non-hazardous location and tied back
in the hazardous location or be connected to a ground in the hazardous
location and tied back in the non-hazardous location.
The glass fiber must have a minimum diameter of 6µm.
For Class II, Division 1, Groups E, F, G and Class III, modules must be
installed in a UL listed Type 4, 4X, 6, 6P, 9, 12, or 12K enclosure. (The power
supply does not need to be put into an additional enclosure. Refer to the
power supply section of this manual for more information.)
Any combination of up to eight FLEX Ex I/O modules may be connected.
This includes using 1794-CE3, 1797-CE3, 1794-CE1, and 1797-CE1 cables.
The ambient temperature range (T
amb
) for this system is -20°C to 70°C.
Channel B is intended for a redundant connection and is identical to the
channel A configuration.
Installation in Division 1/
Zone 1 Modules must not be exposed to the environment. Provide a suitable
enclosure.
ATTENTION
Modules cannot be used in an intrinsically safe
environment after they have been exposed to
non-intrinsically safe signals.