User Guide - Eurotherm Ltda

nanodac RECORDER/CONTROLLER: USER GUIDE4.8.1 Programmer Features menuThis menu allows the user to enable/disable some of the items presented to the user in the Programmer editpage described in Section 3.4.9. Features are enabled/disabled by using the up/down arrow keys to highlightthe required item and then using the scroll button to toggle between enabled (tick) and disabled(cross). Typically, items would be left disabled in order to reduce the number of configuration fields presentedto a user who may not need all such features.Programmer.FeaturesHoldbackPV EventUser ValueMessagesFTP StoreFigure 4.8.1 Programmer features menuHoldbackPV EventUser ValueMessagesHoldback pauses the program (freezes the Programmer setpoint (PSP) and the time remainingparameters) if the difference between the Process value (PV) and the PSP exceedsa user-specified amount (deviation). The program remains paused until the PVreturns to within the specified deviation.In ramp or step segments, holdback indicates that the PV is lagging the SP by more thanthe specified amount and that the program is waiting for the process to catch up. In adwell segment, holdback is used to guarantee that a work piece stays at set-point withina specified tolerance for the specified dwell duration.Holdback type and deviation value are configured, on a per program basis, to be appliedto either the entire program or to individual segments. See Program edit (Section3.4.9) for details.A PV Event is available for each channel in every segment except for Wait and Go Backsegment types. A PV Event is an absolute or deviation analogue alarm on the channelPV, and can be used to trigger a secondary process, or to trigger an analogue alarm.A user value can be entered for every segment (except for Wait or Go Back types) andwhen the segment is entered, this value is transferred to the associated User Value Outputparameter, which could be wired to another parameter to form part of an applicationstrategy.Table 4.8.1, below, lists the programmer specific events that generate messages thatare displayed in the message summary and recorded into the history file.It is also possible to trigger custom messages from any of the programmer outputs viauser wiring. The program name and segment name can be embedded in custom messagesby inserting the modbus address for the current program / segment name parametersin square brackets i.e.:[][]HA030554Issue 7 Nov 12Page 125