12LS Controller Installation and Operation Manual, Rev 3 ... - Watlow

+-------------------------------------------------------------+¦ PARAMETERS SPECIFIC TO EACH SEGMENT ¦|-------------------------------------------------------------¦¦ Setpoint ¦ Specifies setpoint to be reached at the ¦¦ ¦ end of the segment. If the setpoint from¦¦ ¦ the previous segment is the same, this ¦¦ ¦ setpoint will be held during the segment¦¦ ¦ (soak). If the setpoint is different ¦¦ ¦ the setpoint will make a linear change ¦¦ ¦ between the two setpoints over the time ¦¦ ¦ of the segment (ramp). ¦|-------------------¦-----------------------------------------¦¦ Time ¦ Segment duration time. Time units are ¦¦ ¦ selected from the GLOBALS menu. ¦|-------------------¦-----------------------------------------¦¦ Triggers ¦ Two logic inputs sensed during profile ¦¦ ¦ segment execution. There are 2 types, ¦¦ ¦ latched and unlatched. The state may be ¦¦ ¦ ON or OFF. Default value is OFF ¦|-------------------¦-----------------------------------------¦¦ Event States ¦ The outputs of up to four events to be ¦¦ ¦ set to the selected ON or OFF state at ¦¦ ¦ the end of the segment. The default is ¦¦ ¦ for all events to be OFF. ¦|-------------------------------------------------------------|Triggers: Triggers are logic inputs sensed during profile execution. There are two types, latchedand unlatched. Latched triggers must be TRUE for a segment to begin execution. Once sensed,these triggers are never tested again. Unlatched triggers, however, are tested throughout theexecution of a segment. If an unlatched trigger goes FALSE while a segment is executing, thecontrol loop will go into WAIT mode with the segment timer stopped.Each segment may have up to two triggers specified. Either one being TRUE, whether latched orunlatched, is sufficient for a segment to begin executing.Events: An event takes place at the end of a segment. Each segment may have up to four eventsassigned. These events can be assigned to a specific logic output. They can be active ON or OFF.Tolerance Hold ["Guaranteed Soak"]: A tolerance can be assigned to each segment of eachprofile. This tolerance is a deviation from setpoint. If the process variable is beyond the tolerancelimit from the (instantaneous) setpoint, then the segment will enter a tolerance hold until theprocess variable is within tolerance. There is no logic output available to indicate the tolerancehold condition, only a visual indication.4-36