From, INSTD – Signal connection or input

Block SymbolsLicensing group: STANDARD
PIC PIC

Function Description
The two blocks From (signal connection) and INSTD (standard input) share the same symbol. They are used for referring to another signal, either internal or external.

The From block can be used in both the REX control system and the Matlab-Simulink environment, the INSTD block exists only in the REX control system.

The following rules define how the RexComp compiler distinguishes between the two block types:

There is no INSTD block in the Matlab-Simulink system, even the blocks whose GotoTag parameter contains the __ delimiter are considered to be of the From type. This property is suitable for simulation of both the control system and the controlled system. The model can be connected via From and Goto blocks, whose GotoTag parameters include the __ delimiter. Moreover it is possible to use one .mdl file for both simulation and real time control without any modifications if the controlled system model is "hidden" in a subsystem whose name starts with Simulation. The RexComp compiler ignores (omits) such subsystems. For further details see [2].

Output

value

Signal coming from I/O driver or Goto block. The type of output is determined by the type of the signal which is being referred by the GotoTag parameter.

unknown

Parameter

GotoTag

Reference to a Goto block with the same GotoTag parameter, which should be connected with the From block or a reference to input signal of the REX control system driver, which should provide data through the block’s output.

string