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3.4.5 Temperature Derating for UIO The maximum outside module temperature must be limited depending on the internal dissipation. Attention • Airflow through the module is assumed to be natural convection. • Ensure that the UIO modules are installed in the correct position. A UIO module must be mounted in the upright position. To determine the maximum acceptable outside module temperature for a typical configuration, perform the following steps. 1. Perform the Internal Dissipation Calculation for UIO. a. Determine and record the actual configuration data. b. Calculate the totals per dissipation contributor. c. Add the totals of the previous step to determine the internal dissipation. 2. Using the Temperature Derating Curves for UIO, determine the maximum acceptable outside module temperature. 3.4.6 Internal dissipation calculation for UIO To calculate the maximum outside module temperature, you require the IO configuration. The maximum dissipation caused by the kernel logic of the UIO module is a fixed value. The other dissipation contributions depend on the channel configuration