NT21_Reference Manual (V069-E1-1) (986756), страница 62
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No specialsettings are 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)SoundedStoppedPerformed11Display history initialization10Not usedNot performed9Intermittent buzzer (long)SoundedStopped8Backlight modeLitFlashing7Screen printingPerformedNot performed6PT window openingDisabledEnabled5Numeral/character string inputDisabledEnabled4PT screen switching3Memory table copy execution2Memory table copy type1Alarm history initialization0Not usedAlways 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 turn off the screen during operation of the PT, operate the PT status controlarea as indicated below.296Buzzer, Backlight, and Display ControlSection3-2Set 0 (OFF) for bit 15 in the fourth word (n + 3 words) from the beginning of the PTstatus control area.3-2-5 Redisplaying the Turned-off ScreenThe following operations redisplay the screen that has been turned off by thescreen saver function or due to the operation at the PT status control area.• Switching the displayed screen (the new screen is displayed normally)• Operation at the PT status control area (the previously displayed screen is redisplayed)• Pressing the touch panel (the previously displayed screen is redisplayed)Redisplaying the Screen by Switching the Displayed ScreenIf this method is used, no special operation is necessary to redisplay the screen.The screen is redisplayed automatically.SettingNo special setting is necessary.OperationSwitching the screen during operation of the PT cancels the screen off statusand displays the new screen.
For the procedure for switching the screen, refer toNO TAG Switching the Screen (page NO TAG).Redisplaying the Screen by the Operation at the PT Status Control AreaThis method allows the operator to redisplay the screen at any required time.SettingWords must be allocated for the PT status control area in the host. No specialsettings are required for the control of buzzer.297SectionBuzzer, Backlight, and Display ControlThe 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.Operation151413123-211109876543210Bit00Controlled Item1 (ON)0 (OFF)15Screen displayPerformedNot 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 switching3Memory table copy execution2Memory table copy type1Alarm history initialization0Not usedAlways 0StoppedSoundedDisabledEnabledPerformedNot 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 redisplay the screen during the operation of the PT, operate the PT statuscontrol area as indicated below.Set 1 (ON) for bit 15 in the fourth word (n + 3 words) from the beginning of the PTstatus control area.Redisplaying the Screen by Pressing the Touch PanelUsing this method, an operator can redisplay the screen easily by operation atthe PT.! CautionDo not press the touch panel carelessly while the backlight is off or while thescreen is displaying nothing.Confirm system safety before pressing the touch panel.Reference:S Even if a position on the touch panel where a touch switch is set is pressed, thetouch switch function is not executed but the screen is displayed.S If the contents of an element have been changed while the screen is off, theelement is redisplayed in the new state.SettingNo special setting is necessary.OperationPressing the touch panel cancels the screen off status to redisplay the screenthat was displayed immediately before the screen was turned off.298SectionScreen Display and Notification3-33-3Screen Display and NotificationThis section describes the each procedure for changing and checking thescreen displayed by the PT.Reference: The methods of controlling PT status that are described below are not correct forPTs in NT20S or NT30/620 compatible mode.
Refer to Appendix C for details onthe NT20S and NT30/620 compatible modes (page NO TAG).3-3-1 Switching the ScreenThe PT provides the following four methods for switching the screen.• Operation at the PT status control area• Pressing a touch switch that has the Switch Screen function• Using the screen switching function in the bit memory table• Using the screen switching function of the alarm list/history functionSwitching the Screen by the Operation at the PT Status Control AreaWith this method, the screen can be switched to the required screen at the required time by the command given by the host.PTPCPT status control areaScreen switch setting← Screen numberCopy memoryDesignated screentable entry settingPT status control settingReserved for system useSettingWords must be allocated for the PT status control area in the host.
No specialsettings are required for the control of buzzer.OperationAt the beginning of the PT status control area (word n), there is an area (screenswitch setting area) for the screen switching command and screen number notification.Wordnn+1n+215 14 13 12 11 10 9876543210Screen No. (4-digit BCD or hexadecimal)Copy source memory table entrynumber (4-digit BCD or hexadecimal)Copy destination memory table entrynumber (4-digit BCD or hexadecimal)n+3PT status control bitsn+4Reserved for system useBitScreen switch settingCopy memory tableentry settingPT status controlThe configuration and functions of these words are differentwhen the PT is in NT20S or NT30/620 compatible mode.To switch the screen, operate the PT status control area as indicated below.Write the screen number of the screen to be displayed at the beginning of the PTstatus control area (word n) either in 4-digit BCD or 4-digit hexadecimal.
Whichof the BCD or hexadecimal notation should be used is set for Numeral StorageType of Tools – PT Configuration – System with the Support Tool.The screen numbers that can be set are:• 0000:No display (screen off)• 0001 to 3999:Screen No. 1 to No. 3999299SectionScreen Display and NotificationReference:3-3• 9001:Occurrence history screen• 9002:Frequency history screen• 9021 to 9023:Device Monitor functionNT631/NT631C only)• 9030:Brightness and contrast adjustment screen (NT31/NT31C orNT631/NT631C only)screens(NT31/NT31CorS To display overlapping screens, specify the screen number of the parentscreen.S When the PT is started up, the screen of which screen number is stored forScreen Switch Setting in PT status control area is displayed.If the screen number stored for Screen Switch Setting is not correct, the screenis displayed according to the screen number set for Initial Screen of System inPT Configuration.
If the screen number set for Initial screen is not correct, theerror screen (No Starting Screen) is displayed.S The screen is not switched if elements have not been registered for the specified screen number.S Screen number 9020 (Programming Console function screen) cannot be displayed using operations in the PT Status Control Area.Switching the Screen by Pressing the Touch Switch with the Switching ScreenFunctionThis method allows the screen to be switched by operation at the PT.Setting screen No.
5 for the touch switchTo next screenScreen No. 5Reference: 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 page 370 fordetails.)SettingWhen creating the screen using the Support Tool, set the Switch Screen functionfor a touch switch and specify the screen number of the screen to be switched to.This screen number should be registered to the screen.The screen numbers that can be specified are:300• 0001 to 3999:Screen No. 1 to No. 3999• 9001:Occurrence history screen• 9002:Frequency history screen• 9020:Programming Console function screen• 9021 to 9023:Device Monitor functionNT631/NT631C only)• 9030:Brightness and contrast adjustment screen (NT31/NT31C orNT631/NT631C only)screens(NT31/NT31CorSectionScreen Display and Notification• 9999:Reference:3-3Return to the previous screenS To display overlapping screens, specify the screen number of the parentscreen.S The screen is not switched if elements have not been registered to the specified screen number.Press the touch switch with the screen switching function when the screen is tobe switched.OperationReference:S When the screen is changed over, the screen switching strobe of the PT statusnotify bit changes to 1 (ON), after the new screen number is written to thescreen switching setting area in the PT status control area, so that the event ofscreen switching is notified to the host.
After that the screen switching strobereturns to 0 (OFF) automatically. (Refer to page 305.)S When NT20S or NT30/620 compatible mode is being used, the current screennumber occupies the first word of the PT status notify area and the word containing the PT status notify bits is shifted down one word.
(Refer to pageNO TAG.)Example of UseScreens Other Than No. 9999To next screenWhen touch switch 1 is pressedScreen number 5Screen number 5 is set for touch switch 1Screen No. 9999Previous screenMenu ScreenOperation 1Operation 2Screen switching@ Instruction from host@ Screen switchover keyScreen number9999 is set fortouch switch 1Touch switch 1 pressed301SectionScreen Display and Notification3-3Switching the Screen by Using the Switch Screen Function of the Bit Memory TableIf this method is used, it is possible to switch the screen by bit operation at thehost.PTDisplayScreen No. 3PCBit table entry 1Screen No.
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