Enabled Component
The following example implements a component similar to a Simulink® enabled subsystem:
component EnabledComponent inputs enabled = 0; % control signal u = 0; % input signal end variables (Event=true) x = 0; % state to hold output if necessary end outputs y = 0; % output end parameters held = true; % set true for held or false for reset y_init = 0; end events when edge(held && ~(enabled>0)) x = u; % if necessary, hold input on falling edge end end equations if enabled > 0 y == u; elseif held==true y == x; else % not enabled and not held y == y_init; end end end
The component has two inputs: control signal enabled
and
data signal u
.
The block operation depends on the value of the held
parameter:
if it is true
, then the event variable x
assumes
the value of the input data signal u
on the falling
edge of the control signal.
As long as the control signal has a positive value, the output y
matches
the input data signal u
. When the control signal
is negative:
If
held
istrue
, the output porty
outputs the most recent held value of the event variable.If
held
isfalse
, the output resets to the initial value, specified by they_init
parameter.