Rockwell Automation 1797-OE8 FLEX Ex Analog Modules User Manual - Manual (Page 73)

Publication 1797-6.5.1 - May 2005
Applying FLEX Ex Analog I/O Modules 6-7
I/O
The input and output modules comply fully to and provide simple entity
parameters. These modules can directly interface with a wide variety of
intrinsically safe controls and instrumentation. Because all field device power is
supplied directly from the I/O module, no extra wiring or power sources are
needed in a hazardous area.
Finally, these modules maintain intrinsic safety in hazardous areas by providing
isolation from other modules in the system as well as intrinsic safety
segregation between channels on the same module.
Optimize Power
Distribution Your FLEX Ex system must use adequate power supplies to support the
physical locations determined earlier in this chapter. Each FLEX Ex I/O
module in the system is rated for input power, and the FLEX Ex power supply
is rated in the number of output channels and power available from each
channel.
Assigning Power Supplies
Note the amount of power each module requires and assign it to a power
supply output. Continue to assign modules to the power supply output until
the supply’s output power rating is consumed. The graphic below shows the
number of modules per power supply output.
Each power supply output in the FLEX Ex system is rated for 8.5W.
Modules can be attached to the output until their combined power equals
that number. Do not exceed the power supply maximum of 8.5W.
Modules
0
5
3
2
1
4
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
IRT8
1.6W
41661
IBN16
2.8W
IBN16
2.8W
IBN16
2.8W
IBN16
2.8W
IBN16
2.8W
IBN16
2.8W
IBN16
2.8W
IJ2
4.25W
IJ2
4.25W
IJ2
4.25W
IJ2
4.25W
OE8
6.3W
IE8
7.5W
ACNR
8.5W
RPFM
(In
RPFM
(In
RPA
8.5W
Modules Per Power Supply Output