| ACCELERATION | 1.0 | | | positive rate of change of velocity. |
| ACCUMULATED_TIME | 1.2 | | | accumulated time for an activity or event. |
AMPERAGE | 1.0 | 1.6 | | strength of electrical current. DEPRECATED in Version 1.6. Replaced by AMPERAGE_AC and AMPERAGE_DC. |
| AMPERAGE_AC | 1.6 | | | electrical current that reverses direction at regular short intervals. |
| AMPERAGE_DC | 1.6 | | | electric current flowing in one direction only. |
| ANGLE | 1.0 | | | angular position. |
| ANGULAR_ACCELERATION | 1.0 | | | positive rate of change of angular velocity. |
| ANGULAR_DECELERATION | 1.7 | | | negative rate of change of angular velocity. |
| ANGULAR_VELOCITY | 1.0 | | | rate of change of angular position. |
| ASSET_UPDATE_RATE | 1.7 | | | average rate of change of values for assets in the MTConnect streams. The average is computed over a rolling window defined by the implementation. |
| AXIS_FEEDRATE | 1.0 | | | feedrate of a linear axis. |
| BATTERY_CAPACITY | 2.1 | | | maximum rated charge a battery is capable of maintaining based on the battery discharging at a specified current over a specified time period. |
| BATTERY_CHARGE | 2.1 | | | value of the battery’s present capacity expressed as a percentage of the battery’s maximum rated capacity. |
| CAPACITY_FLUID | 1.5 | | 2.5 | maximum amount of fluid that can be held by a container. |
| CAPACITY_SPATIAL | 1.5 | | 2.5 | maximum amount of material that can be held by a container. |
| CHARGE_RATE | 2.1 | | | value of the current being supplied to the Component for the purpose of charging. |
| CONCENTRATION | 1.2 | | | percentage of one component within a mixture of components. |
| CONDUCTIVITY | 1.2 | | | ability of a material to conduct electricity. |
| CUTTING_SPEED | 1.5 | | | speed difference (relative velocity) between the cutting mechanism and the surface of the workpiece it is operating on. |
| DECELERATION | 1.7 | | | negative rate of change of velocity. |
| DENSITY | 1.5 | | | volumetric mass of a material per unit volume of that material. |
| DEPOSITION_ACCELERATION_VOLUMETRIC | 1.5 | | | rate of change in spatial volume of material deposited in an additive manufacturing process. |
| DEPOSITION_DENSITY | 1.5 | | | density of the material deposited in an additive manufacturing process per unit of volume. |
| DEPOSITION_MASS | 1.5 | | | mass of the material deposited in an additive manufacturing process. |
| DEPOSITION_RATE_VOLUMETRIC | 1.5 | | | rate at which a spatial volume of material is deposited in an additive manufacturing process. |
| DEPOSITION_VOLUME | 1.5 | | | spatial volume of material to be deposited in an additive manufacturing process. |
| DEW_POINT | 2.1 | | | temperature at which moisture begins to condense, corresponding to saturation for a given absolute humidity. |
| DIAMETER | 1.6 | | | dimension of a diameter. |
| DISCHARGE_RATE | 2.1 | | | value of current being drawn from the Component. |
| DISPLACEMENT | 1.0 | | | change in position of an object. |
| DISPLACEMENT_ANGULAR | 2.1 | | | absolute value of the change in angular position around a vector |
| DISPLACEMENT_LINEAR | 2.1 | | | absolute value of the change in position along a vector. |
| ELECTRICAL_ENERGY | 1.2 | | | Wattage used or generated by a component over an interval of time. |
| EQUIPMENT_TIMER | 1.4 | | | amount of time a piece of equipment or a sub-part of a piece of equipment has performed specific activities. |
| FILL_HEIGHT | 2.5 | | | amount of a substance in a container. |
| FILL_LEVEL | 1.2 | | | amount of a substance remaining compared to the planned maximum amount of that substance. |
| FLOW | 1.2 | | | rate of flow of a fluid. |
| FOLLOWING_ERROR | 2.1 | | | difference between actual and commanded position at any specific point in time during a motion. |
| FOLLOWING_ERROR_ANGULAR | 2.1 | | | angular difference between the commanded encoder/resolver position and the actual encoder/resolver position at any specified point in time during a motion. |
| FOLLOWING_ERROR_LINEAR | 2.1 | | | difference between the commanded encoder/resolver position and the actual encoder/resolver position at any specified point in time during a motion. |
| FREQUENCY | 1.0 | | | number of occurrences of a repeating event per unit time. |
GLOBAL_POSITION | 1.0 | 1.1 | | position in three-dimensional space. DEPRECATED in Version 1.1. |
| GRAVITATIONAL_ACCELERATION | 2.1 | | | acceleration relative to Earth’s gravity of 9.80665 METER/SECOND^2. |
| GRAVITATIONAL_FORCE | 2.1 | | | force relative to earth’s gravity. |
| HUMIDITY_ABSOLUTE | 1.6 | | | amount of water vapor expressed in grams per cubic meter. |
| HUMIDITY_RELATIVE | 1.6 | | | amount of water vapor present expressed as a percent to reach saturation at the same temperature. |
| HUMIDITY_SPECIFIC | 1.6 | | | ratio of the water vapor present over the total weight of the water vapor and air present expressed as a percent. |
| LENGTH | 1.3 | | | length of an object. |
LEVEL | 1.1 | 1.2 | | level of a resource. DEPRECATED in Version 1.2. See FILL_LEVEL. |
| LINEAR_FORCE | 1.2 | | | forcepush or pull on a mass which results in an acceleration. applied to a mass in one direction only. |
| LOAD | 1.0 | | | actual versus the standard rating of a piece of equipment. |
| MASS | 1.2 | | | mass of an object(s) or an amount of material. |
| OBSERVATION_UPDATE_RATE | 1.7 | | | average rate of change of values for data items in the MTConnect streams. The average is computed over a rolling window defined by the implementation. |
| OPENNESS | 2.0 | | | percentage open where 100% is fully open and 0% is fully closed. |
| ORIENTATION | 1.6 | | | angular position of a plane or vector relative to a cartesian coordinate system3D orthogonal coordinate system ISO/IEC 19794-5:2011(en. |
| PARTICLE_COUNT | 2.5 | | | number of particles counted by their size or other characteristics. |
| PARTICLE_SIZE | 2.5 | | | size of particles counted by their size or other characteristics. |
| PATH_FEEDRATE | 1.0 | | | feedrate for the axes, or a single axis, associated with a Path component. |
| PATH_FEEDRATE_PER_REVOLUTION | 1.5 | | | feedrate for the axes, or a single axis. |
| PATH_POSITION | 1.1 | | | position of a control point associated with a Controller or a Path. |
| PH | 1.1 | | | acidity or alkalinity of a solution. |
| POSITION | 1.0 | | | point along an axis in a cartesian coordinate system3D orthogonal coordinate system ISO/IEC 19794-5:2011(en.. |
| POSITION_CARTESIAN | 2.1 | | | point in a cartesian coordinate system3D orthogonal coordinate system ISO/IEC 19794-5:2011(en.. |
| POWER_FACTOR | 1.2 | | | ratio of real power flowing to a load to the apparent power in that AC circuit. |
| PRESSURE | 1.0 | | | force per unit area measured relative to atmospheric pressure. Commonly referred to as gauge pressure. |
| PRESSURE_ABSOLUTE | 1.7 | | | force per unit area measured relative to a vacuum. |
| PRESSURIZATION_RATE | 1.7 | | | change of pressure per unit time. |
| PROCESS_TIMER | 1.4 | | | amount of time a piece of equipment has performed different types of activities associated with the process being performed at that piece of equipment. |
| RESISTANCE | 1.2 | | | degree to which a substance opposes the passage of an electric current. |
| RESISTIVITY | 2.5 | | | inability of a material to conduct electricity. |
| ROTARY_VELOCITY | 1.2 | | | rotational speed of a rotary axis. |
| SETTLING_ERROR | 2.1 | | | difference between actual and commanded position at the end of a motion. |
| SETTLING_ERROR_ANGULAR | 2.1 | | | angular difference between the commanded encoder/resolver position, and the actual encoder/resolver position when motion is complete. |
| SETTLING_ERROR_LINEAR | 2.1 | | | difference between the commanded encoder/resolver position, and the actual encoder/resolver position when motion is complete. |
| SOUND_LEVEL | 1.2 | | | sound level or sound pressure level relative to atmospheric pressure. |
SPINDLE_SPEED | 1.0 | 1.2 | | rotational speed of the rotary axis. DEPRECATED in Version 1.2. Replaced by ROTARY_VELOCITY. |
| STRAIN | 1.2 | | | amount of deformation per unit length of an object when a load is applied. |
| TEMPERATURE | 1.0 | | | degree of hotness or coldness measured on a definite scale. |
| TENSION | 1.4 | | | force that stretches or elongates an object. |
| TILT | 1.2 | | | angular displacement. |
| TORQUE | 1.0 | | | turning force exerted on an object or by an object. |
| VELOCITY | 1.0 | | | rate of change of position of a Component. |
| VISCOSITY | 1.2 | | | fluid’s resistance to flow. |
VOLTAGE | 1.0 | 1.6 | | electrical potential between two points. DEPRECATED in Version 1.6. Replaced by VOLTAGE_AC and VOLTAGE_DC. |
| VOLTAGE_AC | 1.6 | | | electrical potential between two points in an electrical circuit in which the current periodically reverses direction. |
| VOLTAGE_DC | 1.6 | | | electrical potential between two points in an electrical circuit in which the current is unidirectional. |
| VOLT_AMPERE | 1.2 | | | apparent power in an electrical circuit, equal to the product of root-mean-square (RMS) voltage and RMS current (commonly referred to as VA). |
| VOLT_AMPERE_REACTIVE | 1.2 | | | reactive power in an AC electrical circuit (commonly referred to as VAR). |
| VOLUME_FLUID | 1.5 | | | fluid volume of an object or container. |
| VOLUME_SPATIAL | 1.5 | | | geometric volume of an object or container. |
| WATER_HARDNESS | 2.7 | | | concentration of calcium carbonate (CaCO3) in water |
| WATTAGE | 1.0 | | | power flowing through or dissipated by an electrical circuit or piece of equipment. |
| X_DIMENSION | 1.6 | | | dimension of an entity relative to the X direction of the referenced coordinate system. |
| Y_DIMENSION | 1.6 | | | dimension of an entity relative to the Y direction of the referenced coordinate system. |
| Z_DIMENSION | 1.6 | | | dimension of an entity relative to the Z direction of the referenced coordinate system. |