The sum block adds two input signals in scaled fixed notation and produces an output.
Auto Scale: Rescales the range when either the maximum or minimum value is exceeded.
Const: Indicates the value of the output signal.
Input Count: Sets the number of inputs for the block.
Input Sign: Sets the sign of each input. To set the sign, select the input number from the drop-down list, then choose either the “-” or “+” radio button. You can display the sign on the block by activating the View > Connector Labels command.
Min Val Seen: Displays the low watermark of values that come through the block. This is a read-only field.
Max Val Seen: Displays the high watermark of values that come through the block. This is a read-only field.
Radix Point (bits): Sets the binary point.
Representable Range: Indicates the range of values based on the selected radix point. This is a read-only field.
Warn on Overflow: Activates a warning dialog box that appears when an overflow error occurs. An overflow error occurs when a result value is outside the currently acceptable range. You must also activate Enable Overflow Alert Messages in the dialog box for the Fixed Point Block Set Configure command under the Tools menu.
Word Size (bits): Sets the word size for the target architecture. The word size can be overridden using Override Word Size in the dialog box for the Fixed Point Block Set Configure command under the Tools menu.