Rockwell Automation 1797-BCNR FLEX Ex Redundant ControlNet Barrier Module - Manual (Page 20)

20 FLEX Ex Redundant ControlNet Barrier Module
Publication 1797-5.35 - July 2004
UL, C-UL ControlNet Ex System Diagram Notes
The entity concept allows interconnection of intrinsically safe apparatus
with associated apparatus not specifically examined in combination as a
system when the approved values of V
oc
and I
sc
or V
t
and I
t
of the associated
apparatus are less than or equal to V
max
and I
max
of the intrinsically safe
apparatus and the approved values of C
a
and L
a
of the associated apparatus
are greater than C
i
+ C
cable
and L
i
+ L
cable
respectively for the intrinsically safe
apparatus.
Wiring methods must be in accordance with the National Electric Code,
ANSI/NFPA 70, Article 504 and 505 or the Canadian Electric Code CSA
C22.1, Part 1, Appendix F. For additional information refer to ANSI/ISA
RP12.6.
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.
➅ 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.)
➆ 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.
➇ The ambient temperature range (T
amb
) for this system is -20 o C to 70 o C.
➈ Channel B is intended for a redundant connection and is identical to the
channel A configuration.