User Guide - Eurotherm Ltda

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nanodac RECORDER/CONTROLLER: USER GUIDE4.5.4 Counter configurationThis allows the user to set up a counter to count trigger inputs (or it may be incremented from the Configurationpage. The Rollover Value of the counter is configurable (default 1,000,000). Counters can be cascadedby wiring from ‘Rollover’ of one counter to ‘trigger’ of the next. Wiring is carried out from the operatorinterface (Section 7) or in iTools (Section 6).For ‘Trend’, ‘Alarm 1’ and ‘Alarm 2’ configurations please see the relevant parts of Section 4.4.Virtual Channel.1.MainDescriptorTypeOperationPVStatusResolutionUnitsLow Cut OffHigh Cut OffInput1PresetPreset ValueTriggerRolloverRollover ValueDisableVirtualChan1CounterOn123436 unitsGood0units0999999015.324100NoCounter 1Input 1 RolloverNo1000000Figure 4.5.3 Typical Counter configuration1 to 10 6Counter 2Input 1 Rollover10 6 to 10 12Counter 3Input 1 Rollover10 12 to 10 18Cascading countersetc.DescriptorTypeOperationPVStatusResolutionUnitsLow Cut OffHigh Cut OffInput1PresetPreset ValTriggerRolloverAllows the user to enter a descriptor (20 characters max.) for the counter.Select: Math, Counter or Totaliser.Allows the user to enable (‘On’) or disable (‘Off’) the counter.Read only. Shows the dynamic value of the counter.Read only. Reflects the status of the input channel.Allows the number of decimal places (up to six) to be defined for the channel.Allows a units string of up to five characters to be entered for the counter valueSpecifies a value below which the counter will not decrement.Specifies a value above which the counter will not increment.The amount by which the counter is incremented each time ‘Trigger’ goes high. Thevalue may be entered manually, or wired from another parameter. Negative valuescause the counter to decrement.Setting this to ‘Yes’ causes the counter to adopt its Preset Value. The field returns immediatelyto ‘No’. The counter can also be preset by wiring from another parameter.Allows the entry of a value, from which the counter is to start incrementing or decrementing.Setting this to 1, causes the current value of the input source to be added to the Countervalue. This function can be carried out manually, or the input can be wired from anotherparameter (Section 7.2).This is the rollover output which will be set for one execution cycle when the counterrolls over. This output can be used to expand the range of the cascade counters by wiringit to the Trigger input of the next counter.Page 96HA030554Issue 7 Nov 12
nanodac RECORDER/CONTROLLER: USER GUIDERollover ValueDisableThis is the value at which the counter will rollover and is configurable in the same wayas the totaliser. When the counter rolls over the difference between the rollover valueand the calculated output will be added to 0.Example 1: with a rollover value of 1000 and a current output of 999 and an input of 5,then the output will become 4 when the counter is next triggered.Example 2: with a rollover value of -1000 and a current output of -999 and an input of-5, then the output will become -4 when the counter is next triggered.Note: in both examples, the Rollover output will be set for 1 execution cycle.Allows the user temporarily to suspend counting. The output retains the pre-disabledvalue until the counter is re-enabled, when it resumes counting from that value. Thecounter is toggled between being enabled (cross symbol) and disabled (tick symbol)by means of the scroll key.HA030554Issue 7 Nov 12Page 97
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User Guide - Eurotherm Ltda

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