FLEX Ex 8 Output and HART Analog Modules
49
Publication
1797-IN003J-EN-P - August 2017
Table 3: Flexbus Entity Values for this Module
Any combination of up to eight FLEX Ex I/O modules may be attached on a
flexbus.
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. The internal capacitances Ci of the terminal base must be taken
into account to verify the intrinsic safety.
Simple apparatus is defined as a device which neither generates nor stores
more than 1.2V, 0.1 A, 20
μ
J, or 25 mW.
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.
This module, 1797-OE8 or 1797-OE8H, must be used with terminal base
1797-TB3 or 1797-TB3S.
Terminals 2, 3, 6, 7, 10, 11, 14, 15, 19, 20, 23, 24, 27, 28, 31, 32, 36 to 39,
and 46 to 49 shall not be connected.
WARNING:
Substitution of components may impair intrinsic safety.
Terminals
V
max
(V)
I
max
(mA)
Groups
C
i
(
μ
F)
L
i
(
μ
H)
Female Bus
Connector
5.8
400
A to D
1.35
0
IMPORTANT
For detailed certification information, refer to the FLEX
Ex System Certification Reference Manual, publication
1797-RM001
.