ROC800-Series Instruction Manual
Revised July-2017 Power Connections 3-15
3.2.1 Tuning the Configuration
The PM-12 Power Input module can supply a maximum of 60 W
(60,000 mW) to the backplane. The PM-24, when operating between
–40C to 55C, can supply a maximum of 30 W (30000 mW) to the
backplane. Across its entire operating range (–40C to 85C) the PM-24
can supply 24 W (24000 mW). The PM-30 Power Input module can
supply a maximum of 70 W( at 11 volts dc ) (70,000 mW) to 80W(at 30
volts dc) (80,000mW) at -40°C to 75°C to the backplane.
Refer to Table 3-5 and the value you entered in the Total for ROC800
Base Unit and All Modules line. That is the value against which you
“tune” your configuration to accommodate your Power Input module. If
your configuration requires more power than the Power Input module
you intend to use, you need to modify your I/O module configuration to
reduce your power requirements.
Review the content of Tables 3-6 through 3-20. Suggestions to help
you better align the configuration of your ROC800 with the capability
of the Power Input module you intend to use include:
Reduce the +T usage by providing an external power supply for as
many transmitters or field devices needed to reduce the value in the
Total for ROC800 Base Unit and All Modules line on Table 3-5 to
below the capability of the Power Input module you intend to use.
Reduce the +T usage by reducing the number of transmitters or field
devices.
Reduce the total number of I/O modules by consolidating
transmitters or field devices onto as few I/O modules as possible.
Note: Tuning your I/O module configuration may require several
iterations to rework the content of Tables 3-6 through 3-18 until
your power requirements match the capability of the Power
Input module you intend to use.
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