Rockwell Automation 1747-ACNR15 ControlNet Adapter Module User Manual - Manual (Page 126)

Publication 1747-UM003A-EN-P
B-34 Understanding Your SLC 500/1746 Control System
The following terms are used throughout this section. Familiarize yourself with
them before proceeding further into the section.
Calculating Heat
Dissipation for Your Control
System Watts per point - maximum heat dissipation that can occur in each field wiring
point when energized.
Minimum watts - amount of heat dissipation that can occur when there is no
field power present.
Maximum watts - maximum amount of heat that the module generates with
field power present.
Module Heat Dissipation: Calculated Watts vs. Maximum Watts
There are two ways that you can calculate heat dissipation.
Calculated Watts - if you want to determine the amount of heat generated by
the points energized on your module, use the formula below for calculating the
heat dissipation of each module. Then use these values for calculating the
power supply loading for each chassis - this is done using the worksheet.
(number of points energized x watts per point) + minimum watts =
heat dissipation of module
Maximum watts - maximum amount of heat that the module generates with
field power present. Use maximum watts especially if you are not sure how
many points on a module will be energized at any time.
Terminal Block Release Screws
Maximum Torque = 0.7 to 0.9 Nm
(6 to 8 in-lb.)