Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual - Manual (Page 149)

Publication 1797-6.5.6 - June 2005
1797-IRT8 FLEX Ex Thermocouple/RTD Input Module 31-3
UL, C-UL I/O Entity
Parameters Wiring Methods
• Wiring method 1 - Each channel is wired separately.
• Wiring method 2 - Multiple channels in one cable, providing each
channel is separated in accordance with the National Electric Code
(NEC) or Canadian Electric Code (CEC).
Table 1: Entity Values for Field Device Connections
Wiring
Method
Channel Terminals V
oc
(V)
I
sc
(mA)
V
t
(V)
I
t
(mA)
Groups C
a
(
µF)
L
a
(mH)
1 and 2 Any one
channel
e.g. ch0
0(+), 1(H),
2(L), 3(-)
9.0 37.0 - - A, B, IIC 4.9 20.0
C, E, IIB 14.7 80.0
D, F, G, IIA 39.2 160.0
37, 38, 39
(CJC0)
or
46, 47, 48
(CJC1)
9.0 1.0 - - A, B, IIC 4.9 1000.0
C, E, IIB 14.7 1000.0
D, F, G, IIA 39.2 1000.0
0(+), 1(H),
2(L), 3(-)
37, 38, 39
(CJC0)
or
46, 47, 48
(CJC1)
- - 9.0 38.0 A, B, IIC 4.9 20.0
C, E, IIB 14.7 80.0
D, F, G, IIA 39.2 160.0