Assess the Efficacy of the Low Glucose Suspend (LGS) Feature in the MiniMed Paradigm® X54 System

Inclusion Criteria: * Subject is between the ages of 16 - 60 years old * A clinical diagnosis of Type 1 Diabetes Mellitus, as determined by the Investigator, for a minimum of 12 months duration * Subject has been on a Medtronic insulin pump for at least 3 months, which includes but is not limited to those on sensor augmented insulin pump therapy * Subject has an A1C value between ≥ 7.0% and ≤ 10.0% at time of enrollment; as measured during the screening visit * Subject must have a documented stress treadmill test within the last three years of enrollment if the subject had diabetes for \>20 years * Subject willing to follow protocol and procedures for study. Exclusion Criteria: * Systolic blood pressure on screening visit is \>140 Millimeters of Mercury * Diastolic blood pressure on screening visit is \>90 Millimeters of Mercury * Subject has a history of hypoglycemic seizure or hypoglycemic coma within the last two years * Subject unable to tolerate tape adhesive in the area of sensor placement; * Subject has any active adverse skin condition in the area of sensor placement (i.e. psoriasis, rash, staphylococcus infection) that is not resolved at the time of enrollment * Subject is pregnant or plans to become pregnant during the course of the study * Subject has a history of myocardial infarction, unstable angina, coronary artery bypass surgery, coronary artery stenting, transient ischemic attack, cerebrovascular accident, angina, congestive heart failure, ventricular rhythm disturbances or thromboembolic disease * Subject has active Graves disease * Subject with renal impairment or creatinine above the normal reference range (of the laboratory that the clinical site is utilizing), as demonstrated by the screening laboratory value * Subject is outside of the normal reference range (of the laboratory that the clinical site is utilizing) for hematocrit, as demonstrated by screening laboratory value * Subject is outside of the normal reference range (of the laboratory that the clinical site is utilizing) for potassium, as demonstrated by screening laboratory value * Subject is outside of the normal reference range (of the laboratory that the clinical site is utilizing) for Thyroid-Stimulating Hormone (TSH), as demonstrated by screening laboratory value * Subject is outside of the normal reference range (of the laboratory that the clinical site is utilizing) for free Thyroxine (T4), as demonstrated by screening laboratory value * Subject has history of smoking for \>5 years * Electrocardiogram findings observed during the screening visit, which are deemed by the investigator to represent active ischemia or a condition that would compromise subject safety * The stress treadmill (if subject met inclusion criteria #7) results are deemed by the investigator to represent active ischemia or a condition that would compromise subject safety * Subject is currently participating in an investigational study (drug or device) * Subject is currently on beta blocker medication * Subject has taken oral or injectable steroids within the last 30 days * Subject is deemed by the Investigator to be unwilling or unable to follow the protocol * Subject has a history of diagnosed medical eating disorder * Subject has a history of known illicit drug abuse * Subject has a history of known abuse with prescription medication * Subject has a history of visual impairment which would not allow subject to participate in the study and perform all study procedures safely per investigator discretion * Subject has a history of current alcohol abuse * Any other condition including abnormalities found on the screening tests which in the opinion of the Investigator, may preclude him/her from participating in the study