Rockwell Automation 1797-IRT8 FLEX Ex Thermocouple/RTD Module - Manual (Page 28)

28 FLEX Ex Thermocouple/RTD Input Module
Publication 1797-5.4 - June 2010
Table 1
Table 2
 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 J, or 25 mW.
Wiring
Method
Channel Terminals V
oc
(V)
I
sc
(mA)
V
t
(V)
I
t
(mA)
Groups C
a
( F)
L
a
(mH)
1 and 2 Any one
channel,
for
example,
ch0
0(+), 1(H),
2(L), 3(-)
9.0 37.0 - - A, B 3.0 20.0
C, E 9.0 60.0
D, F, G 24.0 160.0
37, 38, 39
(CJC0)
or
46, 47, 48
(CJC1)
9.0 1.0 - - A, B 3.0 1000.0
C, E 9.0 1000.0
D, F, G 24.0 1000.0
0(+), 1(H),
2(L), 3(-)
37, 38, 39
(CJC0)
or
46, 47, 48
(CJC1)
- - 9.0 38.0 A, B 3.0 20.0
C, E 9.0 60.0
D, F, G 24.0 160.0
Terminals V
t
(V) I
t
(mA) Groups C
a
( F) L
a
( H)
Male Bus
Connector
5.8 400 A-G 3.0 3.0