(a) In any action on a penal bond, containing any condition which has been broken, such damages only shall be assessed as are equitably due, and judgment shall not be rendered for the whole penalty, unless it appears to be due.
(b) If, upon a bond with conditions the breach of which may happen at different times, an action is brought upon the first breach, the court, upon finding a forfeiture of the bond, shall render judgment for what is due in equity at the time, with costs, and award execution. Upon any further or other breach of condition, the obligee, his executors or administrators may take out a scire facias against the obligor, his executors or administrators, from the clerk of the court in which the judgment was given, to show cause why execution should not be awarded for the money then due, or damages then sustained. The court shall thereupon render judgment for what appears to be due in equity and grant execution thereon, and may so render judgment and grant execution, from time to time, until the condition is fully performed. The whole amount of the judgments shall not exceed the penalty of the bond with interest.