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The calculations are based on the power requirements of the assemblies listed in Table 3-1. The current requirements are based on the typical maximum, assuming all channels are in use. Use the following steps to calculate the number of each type of IOP and associated FTA that an individual Power System must support. 1. Determine the number of channels needed for each type of IOP and associated FTA. Divide the total number by the number of channels that are available in the IOP. For example, using Table 3-1, if 256 High Level Analog Input (HLAI) IOP channels are needed, 16 IOPs and FTAs are required (256 channels ÷ 16 channels per IOP = 16 IOPs and 16 FTAs). 2. Multiply the number of IOPs by the current requirement for the type of IOP. For example, 16 model MU-PAIH02 HLAI IOPs require 2928 mA (16 HLAI IOPs x 183 mA = 2928 mA or 2.928 A). The current requirement is added to the Total Module Current for the Power System. 3. Multiply the number of FTAs by the current requirement for the type of FTA. For example, 16 model MU-TAIH12/52 HLAI FTAs require 5120 mA (16 HLAI FTAs x 320 mA = 5120 mA or 5.12 A). The current requirement is added to the Total Module Current for the Power System. 4. If redundant IOPs are required in the same Power System, double the IOP type count. For example, 16 redundant HLAI channels, A and B, require two IOPs (16 channels ÷ 16 channels per IOP x 2 = 2 IOPs). When the redundant IOPs reside in separate Power Systems, half the IOP power requirement is added to each Power System’s Module Current power requirement (IOP A and IOP B). 5. To determine the Total Module Current, add together the total current for both the IOPs and their associated FTAs. For example, using Table 3-1, 256 HLAI channels require 2928 mA of IOP current and 5120 mA of FTA current (256 HLAI channels = 2928 mA+ 5120 mA = 8048 mA or 8.048 A).