NT21_Reference Manual (V069-E1-1) (986756), страница 17
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Refer to Appendix DPC Memory Maps on page 441.Functions of the PT Status Notify AreaReference: When the PT is set to NT20S or NT30/620 compatible mode, there are 3 words inthe PC status notify area instead of 2 words. The added first word indicates whichscreen is currently being displayed at the PT and the original two words areshifted down. Refer to Appendix C for details on the NT20S and NT30/620 compatible modes.Updated Memory Table Entry NumberWhen the contents of a numeral/character string memory table entry has beenchanged by operation at the PT, the number of the memory table entry subject tothe change is written to the content update memory table entry number word asa 4-digit BCD or hexadecimal value.
Whether the value is expressed in BCD orhexadecimal is determined by the setting for numeral storage type in the PT configuration settings made with the Support Tool. The classification of memorytable entry can be determined by whether the numeral setting strobe flag or62SectionAreas for Control/Notification2-2character string setting strobe flag is turned ON.
(After turning ON, the flag willautomatically turn OFF.) (Refer to page 63.)PTPCNumeral memory table entry 112345678123456787894561230.PT status notify areaTable entry numberNumeral settingstrobe flagContent update memory tablePT statusAllocated words (numeral memory table entry 1)12345678 → 5 6 7 8 First1 2 3 4 First + 1Updated Memory Table Entry and PT Status of the PT Status Notify AreaWord15 14 13 12 11 10 9m876543210BitUpdated memorytable entryMemory table entry number (4-digit BCD or hexadecimal)m+1 –0–0–0–––––000PT statusString setting strobe flagNumeral setting strobe flagBCDHexadecimal0001 to 19990000 to 07CFNumbersMemory table entry numbers 0 to 1,999 max.Reference: The updated memory table entry number is written only when the memory tablecontents are changed by operation at the PT.
The memory table entry number isnot written when the contents of the numeral memory table entry are changedwith the mathematical function.PT Status Notify BitsThe PT status notify bits have the functions shown below.1514013121110980076543210000Bit1 (ON)0 (OFF)15PT operation statusNotified InformationRunStop13Battery statusLowNormal12Screen switch strobe11Numeral setting strobe flag10Character string setting strobe flagPrintingStoppedOffLit/Flashinggrobal window statusOpenClose4Local window1 statusOpenClose3Local window2 statusOpenClose7Printer operating status6Backlight status5The printer operating status (bit 7) is not supported by the NT21.PT Operation Status (Bit 15)When the PT is in RUN mode, this bit is set to 1.
In other modes, and when theSystem Menu screen is displayed, it is set to 0 (OFF). When this bit is set to 0(OFF), the allocated bits and words are neither read or written.While the PT is in RUN mode, 1 (ON) is periodically written to this bit. In order tocheck whether the PT is operating normally or not, write 0 (OFF) to this bit, then63Areas for Control/NotificationSection2-2read it 30 seconds later. If the setting for the bit is 1 (ON), the PT is judged to berunning, and if it is 0 (OFF), the PT is judged to be stopped.Note To ensure system safety, be sure to periodically read the PT operating status bitfrom the host in order to ensure that the PT is always operating normally.Battery Status (Bit 13)This bit is set to 1 (ON) when the voltage of the battery that backs up the internalmemory of the PT (built-in battery) is low. (An optional Battery is required for theNT21.)If the battery voltage drops, it is impossible to retain data with the resume function and to retain history records, therefore the battery must be replaced with anew one within one week after the battery bit is set to 1 (ON).
For details on howto replace the battery, refer to section 7 of the Setup Manual.Screen Switching Strobe (Bit 12)This bit is set to 1 (ON) when the PT screen is changed by an instruction from thehost or by operation at the PT (ex. use of screen changeover function). After notification to the host, it is automatically returned to 0 (OFF).Numeral Setting Strobe Flag (Bit 11)This bit is set to 1 (ON) when a numeric value is input to a numeral memory tableentry using the numeral input function of the PT. After notification to the host, it isautomatically returned to 0 (OFF).At the same time, the number of the numeral memory table entry to which theinput was made is notified to the content update memory table word.Character String Setting Strobe Flag (Bit 10)This bit is set to 1 (ON) when a character string is input to a character stringmemory table entry using the character string input function of the PT.
After notification to the host, it is automatically returned to 0 (OFF).At the same time, the number of the character string memory table entry to whichthe input was made is notified to the content update memory table word.Printer Operating Status (Bit 7) (Not Supported by the NT21.)This bit is set to 1 (ON) when a printer connected to the PT is printing due to touchswitch operation at the PT or an instruction from the host.
On completion of printing, it returns to 0 (OFF). It is also returned to 0 (OFF) even while printing is inprogress if the PT displays the System Menu or an error screen. (This bit willalways be OFF for the NT21.)The PT can print the following data in the RUN mode.• The currently displayed screen image (by touch switch operation, or operationof the screen printing bit of the PT status control bits)• Display history record data (by pressing the Print Screen touch switch whenscreen number 9001 or 9002 is displayed)• Device Monitor display screens (by pressing the print touch switch whenscreen number 9021, 9022, or 9023 is displayed)Backlight Status (Bit 6)Indicates the status of the EL screen of an NT631 or the backlight of an NT21,NT31/NT31C, or NT631C as follows:• 1 (ON):EL screen off or backlight off• 0 (OFF): EL screen displaying or backlight lit (flashing)However, this bit is returned to 0 (OFF) when the PT displays the System Menuor an error screen.Reference: Whether the backlight is lit continuously or flashes when the backlight status bit isset to 0 (OFF) is determined by the backlight mode bit (bit 8) of the PT status control bits and the Backlight screen attribute.64SectionAreas for Control/Notification2-2Global Window Open Status (Bit 5), Local Window1 Open Status (Bit 4),Local Window2 Open Status (Bit 3)This bit is set to 1 (ON) when a corresponding window is open.
It is returned to 0(OFF) when a corresponding window is closed. (It remains 1 (ON) even if thewindow screen number is switched in the middle of operation.)It is possible to know the screen number of the window that is currently open orthe display position (bottom-left coordinate) by checking the window controlarea.StrobesThe screen switching, numeral setting, and character string setting strobes areautomatically returned to 0 (OFF) after notification to the host. The status of operations at the PT can easily be ascertained by detecting the leading edges ofthese strobes.However, when connected to a CVM1/CV series CPU, if the PC is set forasynchronous operation, the leading edge may not be detected.2-2-3 Window Control Area (Host ↔ PT)Data is written to the window control area from both the PT and the host.
Thestatus of the window is always written.When the data is written to this area from the host, the PT reads the data anddisplay the window with the specified number at the designated position.When the display status of the window (screen No., display position) is changeddue to the operation at PT, current status of the window is written to the wordsallocated in the host.
The host can determine the display status of the window byreading this area.The window control area is configured as nine consecutive words as shown below. The first word (word k) is set in the Control/Notify Area settings in the PTconfiguration settings made with the Support Tool.Word 1514131211109876543210BitScreen No.
(4-digit BCD or hexadecimal)kk+1X coordinate (4-digit BCD or hexadecimal)k+2Y coordinate (4-digit BCD or hexadecimal)k+3Screen No. (4-digit BCD or hexadecimal)k+4X coordinate (4-digit BCD or hexadecimal)k+5Y coordinate (4-digit BCD or hexadecimal)k+6Screen No. (4-digit BCD or hexadecimal)k+7X coordinate (4-digit BCD or hexadecimal)k+8Y coordinate (4-digit BCD or hexadecimal)Global windowLocal Window1Local Window2Reference: It is not necessary to allocate words in the host for window control area when thewindow is not controlled from the host or when the window is not used.Words Allocated for theWindow Control AreaSymbolC-series PCsWords can be allocated for the window control area (PT to host) in the followinghost (PC) data areas.AllocationCV-series PCsAllocationCS/CJ-series PCsAllocationNoneIR AreaOKCIO AreaOKCIO AreaOKHHR AreaOK------HR AreaNot forHost LinkAAR AreaOKAuxiliary AreaNoAuxiliary AreaLLR AreaOK------LR Area*1OKNot forHost Link65SectionAreas for Control/NotificationSymbolC-series PCsAllocationCV-series PCsAllocationCS/CJ-series PCs2-2AllocationTTC Area,Timer PVsNoTimer Area,Timer PVsNoTC Area,Timer PVsNoTU------------TC Area,Timer Completion FlagsNoCTC Area,Counter PVsNoCounter Area,Counter PVsNoTC Area,Counter PVsNoCU------------TC Area,Counter Completion FlagsNoW------------WR AreaTK------------Task FlagsNoDDM AreaOKDM AreaOKDM AreaOKEEM Area *2,current bankOKEM Area,current bankE0_ toEC_---------Not forHost Link---Not forHost LinkEM Area,current bankNot forHost LinkEM Area,EM banks 0 to CNot forHost Link*1: LR 00000 to LR 00199 are converted to CIO 01000 to CIO 01199.*2: The EM Area is supported only by the C200HX/HG/HE (-Z)E PCs.The Auxiliary Area of the CVM1 and CV-series PCs is allocated to system functions, and it cannot be used for purposes other than system use.The range of each memory area differs according to the PC.
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