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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.

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Claim: The ControlValue input to Monitor Traction without a Pin is invalid in 'Figure 11-10: Continuous system example 1' and multiple issues with ControlOperator
Figure 11-10: Continuous system example 1 {ELIDED PINS}
Figure 11-10: Continuous system example 1 {EXPLICIT PINS}
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
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INFO
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ControlOperator
ControlValueKind
ControlValueKind::disable
ControlValueKind::enable
Brake pressure information also flows to a control operator that outputs a control value to enable or disable the Monitor Traction behavior.
Full quote
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.
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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.
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Figure 11-10 shows a simplified model of driving and braking in a car that has an automatic braking system.
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.
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
When the «controlOperator» stereotype is not applied, the behavior may not have a parameter typed by ControlValue.
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