Ground unconnected input port
The Ground block connects to blocks whose input ports do not connect to other blocks. If you run a simulation with blocks having unconnected input ports, Simulink® issues warnings. Using a Ground block to ground those unconnected blocks can prevent these warnings.
The Ground block outputs a signal of the same data type as the port to which it connects. For example, consider the following model:
In this example, the output of the Constant block determines
the data type (
int8) of the port to which the Ground
block is connected. That port determines the output data type of the
The Ground block outputs a signal with zero value. When the output data type cannot represent zero exactly, the Ground block outputs a nonzero value that is the closest possible value to zero. This behavior applies only to fixed-point data types with nonzero bias. The following expressions are examples of fixed-point data types that cannot represent zero:
fixdt(0, 8, 1, 1) — an unsigned
8-bit type with slope of 1 and bias of 1
fixdt(1, 8, 6, 3) — a signed
8-bit type with slope of 6 and bias of 3
If the output is an enumerated data type, the Ground block outputs the default value of the enumeration. This behavior applies whether or not:
The enumeration can represent zero.
The default value of the enumeration is zero.
If the enumerated type does not have a default value, the Ground block outputs the first enumeration value in the type definition.
The Ground block supports all data types that Simulink supports, including fixed-point and enumerated data types. For more information, see Data Types Supported by Simulink in the Simulink documentation.
The following Simulink examples show how to use the Ground block:
Double | Single | Boolean | Base Integer | Fixed-Point | Enumerated | Bus