NT21_Reference Manual (V069-E1-1) (986756), страница 52
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This function is called the resume function.When the resume function is not set, the contents of the memory table entriesare initialized to the defaults (initial values) set with the Support Tool when PToperation has been stopped by turning OFF the power, resetting the PT, or stopping operation from the System Menu.When the resume function is set, the contents of the memory table entries arenot initialized when PT operation has been stopped by turning OFF the power,resetting the PT, or stopping operation from the System Menu.
This means thatthe next time that operation is restarted, the data previously contained in thememory table entries will be written to the host automatically so the same datacan be displayed again at the host after an interruption.The resume function will retain data in numeral memory table entries 0 to 999and character string memory table entries 0 to 499. All other memory table entries will be initialized, whether the resume function is set or not.However, when a word is allocated for a memory table entry in the host and thememory table entry is set not to be initialized, the contents of the word at the hostwill be written to the memory table entry instead of the other way round, thereforethe previous contents of the memory table entry will be lost.Even if the resume function is set, if memory table initialization is executed, thememory table contents will be initialized to the defaults set with the Support Tool.Whether the resume function is used or not is set with the memory switches ofthe PT.
For details, refer to section 6 of the Setup Manual.Reference: When the voltage of the battery becomes too low, the memory table contentscannot be retained even if ON is set for the resume function. The Battery is anoption for the NT21, and the resume function will be disabled if a Battery is notbeing used, regardless of the actually setting of the function.2-16-4 Screen Saver FunctionThe PT has a function to maximize the service life of the backlight and to preventthe formation of an afterimage by turning off the screen display and the backlightif no operation is performed for a certain period of time.If the same data is displayed for a long time (about 24 hours), an afterimage willform on the screen.
To prevent this, either use the screen saver function or periodically switch the screen.The screen saver function only operates when the PT is in operation. It does notoperate during System Menu operation or while the PT is in system installermode.249Section 2-16Special FunctionsThere are the following two types of screen saver function.• Screen saver that turns off the screen and the backlight• Screen saver that displays the contents of character string memory table entry0 for a set length of time each at random positions on the screen (with theNT31C and NT631C, the color is also changed randomly).
With this screensaver, the backlight is not turned off.Note1. Do not press touch switches carelessly while the backlight is off or whilenothing is displayed on the screen.Confirm system safety before pressing touch switches.2. After images may remain if the same pattern is displayed for a long period(approx. 24 hours).To prevent the formation of an afterimage, either use the screen saver function or periodically switch screens.Reference: It is also possible to start the screen saver function using bit 15 (screen display) ofthe PT status control bits.Redisplaying a ClearedScreenWhen a screen has been cleared due to activation of the screen saver function,this screen can be redisplayed by pressing a PT touch switch, or by a screenswitching instruction from the host (if the backlight is off, it is also turned backon).
The screen will not be redisplayed when display contents such as numericvalues or character strings are changed.Setting the Screen SaverFunctionWhether or not the screen saver function is used and, if it is used, the waitingtime for execution, is set with the memory switches of the PT.For details on the setting method, refer to section 6 of the Setup Manual.2-16-5 Buzzer FunctionThe PT buzzer can be sounded to inform of emergencies and PT errors.Reference:S Whether or not the buzzer actually sounds depends on the memory switchsettings made at the PT.
The following three buzzer settings can be made withthe memory switches.• OFF:The buzzer never sounds.• ERR ON: The buzzer only sounds when a PT error occurs.• ON:The buzzer sounds in response to instructions from the hostand screen attributes.For details, refer to section 6 of the Setup Manual.S The buzzer will also sound to indicate that a window, numeral input, or character string input has been disabled by the interlock function or a control bit in thePT status control area.
These sounds are controlled as touch switch soundsand not buzzer sounds.Types of Buzzer250The following three types of buzzer can be sounded by the PT.Continuous BuzzerBuzzer that sounds continuouslyShort Intermittent BuzzerBuzzer that repeatedly alternates between sounding and stopped states of 0.5seconds duration each.Long Intermittent BuzzerBuzzer that repeatedly alternates between sounding and stopped states of 1.0seconds duration each.If more than one buzzer type has been set with the PT status control bits, theorder of priority below is followed (highest priority at the top).Section 2-16Special Functions1, 2, 3...1. Continuous buzzer2.
Short intermittent buzzer3. Long intermittent buzzerFor example, if the continuous buzzer and short intermittent buzzer are specified together, the continuous buzzer sounds.Sounding the BuzzerExcept the case the buzzer is set not to sound at all, the buzzer automaticallysounds when an error occurs at the PT. Apart from this, there are the followingtwo methods for sounding the buzzer.Sounding the Buzzer by Control from the HostThe buzzer can be sounded from the host by operating the PT status controlarea during operation (page 290).A Method to Use the buzzer Screen AttributeBy setting a Buzzer screen attribute when creating screen data with the SupportTool, the buzzer can be sounded when the created screen is displayed (page290).Stopping the BuzzerWhen the buzzer is sounding, it can be stopped in the following ways.• By operating the PT status control area from the host (page 292).However, when this method is used, the buzzer will not be stopped unlessthe bits for all three buzzer types — continuous, short intermittent, and longintermittent — are set to 0 (OFF).• By displaying a screen for which no buzzer attribute is set (page 291).• By pressing a touch key assigned the buzzer stop function (page 293).By creating a touch switch assigned the buzzer stop attribute (the [ ] input key –control) on a screen for which a buzzer attribute is set, the buzzer can bestopped by pressing this switch.2-16-6 Clock FunctionThe PT has a clock function for setting and displaying the date and time.
With theNT31/NT31C and NT631/NT631C, the clock function is backed up by the built-inbattery of the PT.The NT21’s clock function is not a counter. This function just uses the most recent clock data read from the host. (The clock data is not backed up even if theoptional Battery is installed.) Refer to 2-2-4 Clock Data Area (Host to PT, NT21Only) for details on the clock data area.Reference:S When the battery voltage becomes low with the NT31/NT31C orNT631/NT631C, the time data will not be retained by turning OFF the power tothe PT, or resetting the PT, consequently the clock function will not operatecorrectly.S The NT31/NT31C and NT631/NT631C do not allow display and setting ofclock data with the clock function from the Support Tool.
To set the time, useSystem Menu or numeral memory table operations.S With the NT21, only reads the clock data from the host. The time data cannotbe set from the Support Tool or from the System Menu.S The calendar and time data are not set correctly on shipment from the factory.Numeral Memory TableEntries Used with theClock FunctionThe PT uses numeral memory table entries 247 to 255 for clock data.As shown in the table below, numbers 247 to 253 are for display and readingonly, and numbers 254 and 255 are for time setting. (For the NT21, entry numbers 254 and 255 are reserved by the system.)With the NT31/NT31C and NT631/NT631C, numbers 247 through 253 storeclock data, which is updated by the internal clock of the PT.
This data cannot berewritten by the host.251Section 2-16Special FunctionsWith the NT21, the clock data is periodically read from the words allocated in thehost and the data is stored at table entry numbers 247 to 253.FunctionDisplay/p yreadingdionlyNumeralmemorytableentryDigit positionInformationValue247Second00 to 59248Minute00 to 59249Hour00 to 23 24-hour system250Date01 to 31251Month01 to 12252Year253Settinggonlyl(NT31/NT31CanddNT631/NT631Conly)(Re(Reservedwith theNT21)Remarks00 to 99 Last 2 digits of the yearDay of week 00 to 06 See below.254DateHourMinuteSecond255VacantDay ofweekSecond00 to 59Minute00 to 59Hour00 to 23 24-hour systemDate01 to 31Month01 to 12Year00 to 99 Last 2 digits of the yearDay of week 00 to 06YearMonthVacant00The numeric values that correspond to the days of the week are as follows:Day of weekSunMonTueWedThuFriSatValue00010203040506Setting example for the NT31/NT31C and NT631/NT631C:September 28 (Fri), 2001, 14:53:30254 2 8 1 4 5 3 3 0255 0 0 0 5 0 1 0 9Reference: Numeral memory table entries 247 to 255 are provided for clock data use andhost words cannot be allocated for them.Setting Clock DataThe following two methods can be used to set clock data for the NT31/NT31Cand NT631/NT631C.
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