NT21_Reference Manual (V069-E1-1) (986756), страница 61
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There are no special settings required for the control of buzzer.OperationThe bit for controlling the PT status (PT status control bit) is provided at the fourthword (n + 3 words) from the beginning of the PT status control area.15141312111009876543210Bit0Controlled Item1 (ON)0 (OFF)15Screen displayPerformedNot performed14Processing priority registration (for NT link (1:N))RegisteredCanceled13Continuous buzzerSoundedStopped12Intermittent buzzer (short)SoundedStopped11Display history initializationPerformed10Not used9Intermittent buzzer (long)8Backlight modeLitFlashing7Screen printingPerformedNot performed6PT window openingDisabledEnabled5Numeral/character string inputDisabledEnabled4PT screen switching3Memory table copy execution2Memory table copy type1Alarm history initialization0Not usedNot performedAlways 0StoppedSoundedDisabledEnabledPerformedNot performedNumeralCharacter stringPerformedNot performedAlways 0Bits 2 and 3 are not used when the PT is in NT20S or NT30/620compatible mode.Bit 7 is not supported by the NT21.To sound the buzzer during the operation of the PT, operate the PT status controlarea as indicated below.Set 1 (ON) for the following bit in the fourth word (n + 3 words) from the beginningof the PT status control area according to the required buzzer sound.• Continuous sound:Bit 13• Short intermittent sound:Bit 12• Long intermittent sound:Bit 93-2-2 Stopping the Buzzer SoundWith the PT, the following three methods are used for stopping the buzzer sound.• Displaying a screen for which the buzzer attribute is not set• Operating the PT status control area• Pressing a touch switch that has the buzzer stop functionStopping the Buzzer by Displaying a Screen for Which the Buzzer Attribute Is NotSetWhen this method is used, the buzzer stops sounding automatically when thescreen is switched to the one where the buzzer attribute is not set.SettingWhen creating a screen using the Support Tool, cancel the check mark for thebuzzer attribute at the screens where the buzzer should not sound.
(Usually, thebuzzer attribute is not checked.)291SectionBuzzer, Backlight, and Display ControlOperation3-2When the screen for which the buzzer attribute is not checked is displayed during operation of the PT, the buzzer automatically stops sounding. For the procedure for switching the screen, refer to NO TAG Switching the Screen (pageNO TAG).Stopping the Buzzer by the Operation at the PT Control AreaThis method allows the operator to stop the buzzer at any required time.PCPTPT status control areaStopping the buzzerScreen switch settingCopy memorytable entry settingPT status control setting← Control dataReserved for system useSettingWords must be allocated for the PT status control area in the host.
There are nospecial settings required for the control of buzzer.OperationThe bit for controlling the PT status (PT status control bit) is provided at the fourthword (n + 3 words) from the beginning of the PT status control area.15141312111009876543210Bit01 (ON)0 (OFF)15Screen displayControlled ItemPerformedNot performed14Processing priority registration (for NT link (1:N))RegisteredCanceled13Continuous buzzerSoundedStopped12Intermittent buzzer (short)SoundedStopped11Display history initializationPerformedNot performed10Not used9Intermittent buzzer (long)8Backlight modeLitFlashing7Screen printingPerformedNot performed6PT window openingDisabledEnabled5Numeral/character string inputDisabledEnabled4PT screen switchingDisabledEnabled3Memory table copy execution2Memory table copy type1Alarm history initialization0Not usedAlways 0StoppedSoundedPerformedNot performedNumeralCharacter stringNot performedPerformedAlways 0Bits 2 and 3 are not used when the PT is in NT20S orNT30/620 compatible mode.Bit 7 is not supported by the NT21.To stop the buzzer during operation of the PT, operate the PT status control areaas indicated below.Set 0 (OFF) for all of the following bits in the fourth word (n + 3 words) from thebeginning of the PT status control area.• Continuous sound:292Bit 13• Short intermittent sound:Bit 12• Long intermittent sound:Bit 9Buzzer, Backlight, and Display ControlReference:Section3-2S If more than one bit among the bits indicated above is 1 (ON) at the same time,only one type of buzzer sounds according to the priority: continuous buzzer >short intermittent sound > long intermittent sound.
To stop the buzzer when it issounding, set 0 (0) for all bits indicated above; setting 0 (OFF) only for the bitcorresponding to the type of buzzer sound may not stop the buzzer.S When the screen is changed, the buzzer setting in the screen attributes maycause the buzzer status to change, causing it to vary from the status in the PTStatus Control Area bits. For example, the buzzer may stop even though the bitfor a continuous buzzer is ON. If this occurs, reset the bit in the PT Status Control Area.Stopping the Buzzer by Pressing a Touch Switch That Has the Buzzer Stop FunctionUsing this method, an operator can stop the buzzer by the operation at the PT.Usually, a buzzer stop touch switch is registered to a screen for which the buzzerattribute is set to sound the buzzer.Reference: The touch switch operation will be disabled when the touch switch interlock function is being used and the host’s interlock bit that controls the touch switch’s operation is OFF.
(See Disabling Touch Switches with Interlock Bits on pageNO TAG for details.)SettingThere is an input key – control touch switch that has the buzzer stop ( ) function.Register this touch switch on the screen when creating it using the Support Tool.OperationPress the touch switch with the buzzer stop function to stop the buzzer.3-2-3 Controlling the BacklightThe NT21, NT31/NT31C, and NT631C provide the following two backlightmodes.• Light: The backlight is lit continuously.• Flash: The backlight alternates between lit and unlit states.With the NT21, NT31/NT31C, and NT631C, the following two methods are usedfor controlling the backlight mode.• Displaying a screen for which the backlight attribute is set• Operating the PT status control areaReference:S If the screen saver function is set to Display erased, the backlight is turned offwith the screen, which is turned off by the screen saver function if the PT notoperated for a while, or by operation at the PT status control area.
Even whenthe backlight has gone off, it may light or flash according to the setting if thebacklight mode is changed by operation at the PT status control area.S This setting is ineffective in the NT631.293SectionBuzzer, Backlight, and Display Control3-2Controlling the Backlight Status by Displaying a Screen for Which the BacklightAttribute Is SetBy using this method, it is possible to control the backlight automatically when aspecific screen is displayed.SettingSet either of the following statuses for the backlight screen attribute of the screenfor which the backlight is to be controlled when creating it using the Support Tool.(The default setting is Light.)• Light• FlashOperationWhen the screen is changed over during the operation of the PT, the status of thebacklight is controlled according to the setting for the backlight attribute of thenewly called screen.Controlling the Backlight Status by the Operation at the PT Status Control AreaUsing this method, the backlight status (lit/flashing) can be controlled at any required time.Backlight is flashingPTPCPT status control areaScreen switch settingCopy memorytable entry settingPT status control setting← Control dataReserved for system useSetting294Words must be allocated for the PT status control area in the host.
No specialsettings are required for the control of buzzer.SectionBuzzer, Backlight, and Display ControlOperation151413123-2The bit for controlling the PT status (PT status control bit) is provided at the fourthword (n + 3 words) from the beginning of the PT status control area.11109876543210Bit00Controlled Item1 (ON)0 (OFF)15Screen displayPerformedNot performed14Processing priority registration (for NT link (1:N))RegisteredCanceled13Continuous buzzerSoundedStopped12Intermittent buzzer (short)SoundedStoppedPerformed11Display history initialization10Not used9Intermittent buzzer (long)SoundedStopped8Backlight modeLitFlashing7Screen printingPerformedNot performed6PT window openingDisabledEnabled5Numeral/character string inputDisabledEnabled4PT screen switching3Memory table copy execution2Memory table copy type1Alarm history initialization0Not usedNot performedAlways 0DisabledEnabledPerformedNot performedNumeralCharacter stringPerformedNot performedAlways 0Bits 2 and 3 are not used when the PT is in NT20S orNT30/620 compatible mode.Bit 7 is not supported by the NT21.To control the backlight status during the operation of the PT, operate the PT status control area as indicated below.Set 0 (OFF) or 1 (ON) for bit 8 in the fourth word (n + 3 words) from the beginningof the PT status control area.Word n + 3, bit 8• To turn the backlight on: 0 (OFF) 1 (ON)• To flash the backlight: 1 (ON) 0 (OFF)3-2-4 Turning off the ScreenBy turning off the screen while it is not in use, the backlight lasts for a long timeand, at the same time, afterimage on the display panel can be prevented.
Thebacklight is turned off automatically when the screen is turned off. If the screensaver function is set to Display, however, it is not possible to prolong the life of thebacklight since it is not turned off when the screen is turned off.The PT provides the following two methods for turning off the screen.• Using the screen saver function of the PT• Operating the PT status control areaNote To prevent the formation of an afterimage, either use the screen saver functionor periodically switch screens.Reference:S The screen can be made to enter the no-display state by specifying screen No.0. In this state, however, the backlight remains lit or flashing.S While the screen is in the no-display state, only screen switching operationsfrom the host are permitted.S Even though the screen display is set to off, the display of the screen immediately before the screen is turned off remains output by the PT.295SectionBuzzer, Backlight, and Display Control3-2Turning off the Screen Using the Screen Saver Function of the PTIf this method is used, the screen is automatically turned off when no operation isattempted for a preset length of time.SettingUsing the system menu of the PT, set a value other than 000 for Screen SaverStart up Time (the length of time before the screen saver is activated after thelast PT operation) and Display erased for Screen Saver Movement.
(The screensaver function is not executed if 000 is set for Screen Saver Start up Time.)Reference: If a value is set other than 000 for Screen Saver Start up Time and Display forScreen Saver Movement, the character string set in character string table entry 0is displayed on the screen at random. In this case, the backlight is not turned off.If the PT has not been operated (touch switch operation, screen switching operation) for the preset length of time during operation of the PT, the screen is automatically turned off.OperationTurning off the Screen by the Operation at the PT Status Control AreaThis method makes it possible to turn off the screen at any required time.SettingWords must be allocated for the PT status control area in the host.
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