
4
FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply
Publication
1797-5.33 - December 2003
Understand System Planning
Part of system planning is determining what modules are needed for the
application, how many power supplies are needed, how to best partition the
system, and where to locate the system cabinets.
A key task in the development cycle is determining the number of power
supply outputs (thus power supplies) you will need. In the following example,
you will need eleven power outputs if you are using the fiber hub, which
requires 8.5W:
Each power supply has four independent IS power outputs capable of 8.5W
each. In the above example, we required eleven IS power outputs so three
power supplies were sufficient.
Modules
Requires
Modules
Requires
Fiber Hub
8.5W
Two Thermocouple Inputs
1.6W each
Two ControlNet
TM
Adapters
8.5W each
Two Digital Outputs
7.5W each
Two Analog Inputs
7.5W each
Three NAMUR Digital Inputs
2.8W each
Two Analog Outputs
6.3W each
Two Counter Inputs
4.25W each