Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual - Manual (Page 118)

Publication 1797-6.5.6 - June 2005
25-4 1797-OB4D FLEX Ex 24V dc Non-Isolated Source 4 Output Module
Table 2: Flexbus Entity Values Which are Allowed for the Next
FLEX Ex I/O Module
Table 3: Flexbus Entity Values for this Module
Note: 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.
Terminals V
t
(V) I
t
(mA) Groups C
a
(
µF)
L
a
(
µH)
Male Bus
Connector
5.8 400 A-G
IIC, IIB, IIA
3.0 3.0
Terminals V
max
(V) I
max
(mA)
Groups C
i
(
µF)
L
i
(
µH)
Female Bus
Connector
5.8 400 A-G
IIC, IIB, IIA
1.35 0
Hazardous (Classified) Location
Class I, Zone 0 Groups IIC, IIB, IIA
Class I, Div. 1 Groups A, B, C, D
Class II, Div. 1 Groups E, F, G
Class III, Div. 1
Hazardous (Classified) Location
Class I, Zone 1 Groups IIC, IIB, IIA
Class I, Div. 1 Groups A, B, C, D
Class II, Div. 1 Groups E, F, G; Class
III
To any intrinsically safe
device or associated
apparatus with Entity
Concept parameters of
V
oc
< 5.8V; I
sc
< 400mA.
T o any intrinsically safe
device or associated
apparatus with Entity
Concept parameters of
V
oc
< 9.5V; I
sc
< 1A.
To any IS device with Entity
Concept parameters of
(V
max
, I
max
, C
i
, L
i
) appropriate
for connection to associated
apparatus with Entity Concept
parameters listed in Table 2.
1797-OB4D
16
Shield Connection Only
50
51
35
34
V max =5.8V
I max =400mA
C i =1350nF
L i =0
V max =9.5V
I max =1A
C i =0
L i =0
Male Bus
Connector
33
40
41
42
43
44
45
0 (+)
Female Bus
Connector
Any Simple Apparatus or I.S.
device with Entity Concept
parameters (V
max
, I
max
, C
i
, L
i
)
appropriate for connection to
associated apparatus with Entity
Concept parameters listed in
Table 1.
1 (-)
ch0
ch1
ch2
ch3
4 (+)
5 (-)
8 (+)
9 (-)
12 (+)
13 (-)
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