Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual - Manual (Page 180)

Publication 1797-6.5.6 - June 2005
39-4 ControlNet Ex System
Certified Equivalent ControlNet Ex System Diagram Items
You may use these items as equivalents for the items shown on the system
diagram.
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. For additional information refer to
ANSI/ISA RP12.6.
WARNING: Substitution of components may impair intrinsic safety.
System Diagram Name Catalog Number Source
1797-RPA 1797-RPA ⑦ Allen-Bradley
RSD-CFA-Ex.CN ⑦ Pepperl+Fuchs
1797-RPFM 1797-RPFM ⑦ Allen-Bradley
RSD-FC-Ex2.CN ⑦ Pepperl+Fuchs
1797-ACNR15 1797-ACNR15 ⑦ Allen-Bradley
RSD-GW-Ex2.CN ⑦ Pepperl+Fuchs
Coax Trunk Cable 1 1797-RG6 Allen-Bradley
3092A 2 Belden Wire & Cable Co.
3092A with blue jacket Belden Wire & Cable Co.
ControlNet Ex Tap 1797-TPx Allen-Bradley
RS-TPx-Ex Pepperl+Fuchs
CNet Ex Trk Trm 1797-XT Allen-Bradley
RS-XT-Ex Pepperl+Fuchs
CNet Ex Tap Trm 1797-TCAP Allen-Bradley
RS-TCAP-Ex Pepperl+Fuchs
1 In addition to these cable types, the following specification can be followed to allow additional types:
Cable Impedance = 75
Ω ± 3Ω
Cable Capacitance = <5.94nF per 100m
Cable Resistance = >9.08
Ω per 100m
Cable Attenuation 0.2MHz > 0.93dB/100m 5MHz > 1.39dB/100m
(-20 to +70 o C) 0.5MHz > 0.95dB/100m 10MHz > 1.86dB/100m
1MHz > 1.07dB/100m 20MHz > 2.73dB/100m
2MHz > 1.16dB/100m 50MHz > 4.33dB/100m
2 Belden Wire & Cable 1189A may be used, but with functional loss of communication distance and/or nodes.