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When the «controlOperator» stereotype is not applied, the behavior may not have a parameter typed by ControlValue.

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SysML Activity extension stereotypes - REFERENCE CARD
SysMLv1.7 Activity extensions: ControlOperator and ControlValueKind: ADVANCED REFERENCE CARD
Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
UML keywords
Behavior
Operation
SysML keywords
ControlOperator
ControlValueKind
When the «controlOperator» stereotype is applied to behaviors, the behavior takes control values as inputs or provides them as outputs, that is, it treats control as data
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When the «controlOperator» stereotype is not applied, the behavior may not have a parameter typed by ControlValue.
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A control operator is a behavior that is intended to represent an arbitrarily complex logical operator that can be used to enable and disable other actions. ... The «controlOperator» stereotype also applies to operations with the same semantics.
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Brake pressure information also flows to a control operator that outputs a control value to enable or disable the Monitor Traction behavior.
No pins are used on Monitor Traction, so once it is enabled, the continuously arriving enable control values from the control operator have no effect, per UML semantics.
When the brake pressure goes to zero, disable control values are emitted from the control operator. The first one disables the monitor, and the rest have no effect.
While the monitor is enabled, it outputs a modulation frequency for applying the brakes as determined by the ABS system.
The rake notations on the control operator and Monitor Traction indicate they are further defined by activities, as shown in Figure 11-11 and Figure 11-12. An alternative notation for this activity decomposition is shown in Figure 11-13.
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