NT21_Reference Manual (V069-E1-1) (986756), страница 84
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Install the correct system program.The screen doesn’tchange even though theDevice Monitor functionhas been called from thePT status control area.(NT31/NT31C andNT631/NT631C only)The communications protocol settingat the PT is not 1:1 NT Link or 1:NNT Link.Check the memory switches (fourth screen) and setthe connected PC’s serial port protocol to 1:1 NTLink or 1:N NT Link. Set the same protocol in thePC.The system program installed in thePT is for a PC maker other thanOMRON.The Device Monitor function can be used only whenthe PT is connected to an OMRON PC. Refer toVersion Display in section 6 in the Setup Manualand check the system program type. Only OMRONDirect Access system programs with versionnumbers Version 3.j and higher can use theDevice Monitor function.The words that werebeing monitored the lasttime that Device Monitorwas used are notp y the next timedisplayedth t DevicethatD i MMonitorit iiscalled.
(NT31/NT31C andNT631/NT631C only)• The PT was turned OFF.• The PT was reset.The words monitored by Device Monitor areretained even if the Device Monitor is closed, butthe information is cleared when the PT is turnedOFF or reset.Specify the desired words again.The cable was disconnected whileDevice Monitor was being used andthen connected to a PC with asmaller data area.If the cable is connected again to another PC, thePT will clear any word addresses that aren’tsupported in that PC. Check the ranges of dataareas in the PC and set word addresses withinthose ranges.423SectionTroubleshootingPT SymptomsA numeral/text display isnot displayed correctly,nothing is displayed for atext display, or a messageis not displayedp y for anllilist/history.t/hi talarmCause6-1RemedySince the memory table entry isallocated words in the host, thedisplay is updated in accordancewith the contents of the hostmemory.When the contents of the memory table entry areset as a fixed value, do not allocate words for thememory table entry in the host.The battery voltage has dropped andthe data in the memory table hasbeen destroyed.
(Applies to NT21only when optional Battery is used.)Replace the battery and execute memory tableinitialization. (Refer to Initializing the Memory Tablesand Replacing the Battery in sections 6 and 7respectively in the Setup Manual.)Since ON is set for the resumefunction, the initial values of thescreen data memory are not writtento the memory tables. (Applies toNT21 only when optional Battery isused.)Execute memory table initialization. (Refer toInitializing the Memory Tables in section 6 in theSetup Manual.)If the resume function does not need to be used,use the PT with the resume function OFF.
(Refer toSetting the Resume Function in section 6 in theSetup Manual.)Two words have been set in anumeral memory table entry for anindirect address for a number/textdisplay.Set only one word in the numeral memory tableentry.Malfunction due to external noiseCarry out grounding work in accordance with theconditions. (Refer to Grounding in section 3 in theSetup Manual.)There are too many numeral/textdisplays on the displayed screen.Reduce the number of numeral/text displays on thescreen for which updating is delayed.The cycle time is extended due toheavy processing at the host.Shorten the host cycle time.In an RS-422A/485 connection,there is illegal branching or anerroneous terminator setting.Wire correctly. (Refer to section 5 in the SetupManual.)Some of the elementsaa ged oo aarrangedon a normalscreen are not displayed.The quantity of read data exceedsthe stipulated restriction.Check the maximum number of elements bye e g to Displaysp ay Restrictionsest ct o s (page 437),3 ), ccreateeatereferringthe screen data again, then transmit all of thescreen data in a batch to the PT.On overlapping screens,some of the set elementsare not displayed.Since the data is transmitted fromthe host in screen units, the numberof elements on the overlappingscreens has exceeded the maximumpermissible without being checkedby the Support Tool.Check the maximum number of elements byreferring to Display Restrictions (page 437), createthe screen data again, then send all the screen datain a batch to the PT.The System Menu cannotbe called up.Display System Menu under ChangeSystem Settings in the SystemInstaller mode is set to Disabled.In the System Installer mode, set Display SystemMenu to Enabled.
(Refer to Section 6 of the SetupManual.)Updating of numericvalues and text isydelayed.424The total of the element coefficientsfor the displayed screen is greaterthan 1,024.SectionTroubleshootingPT SymptomsCause6-1RemedyThe following SystemMenu operations are notpossible.- Establishing theTransmit mode- Displaying the memoryswitch setting screens- Screen data memorycheck- Displaying theinitialization menu- Displaying thecalendar/time settingscreen (NT31/NT31Cand NT631/NT631Conly)Screen Memory Protect underChange System Setting in theSystem Installer mode is set toDisabled.In the System Installer mode, set Screen MemoryProtect to Enabled. (Refer to Section 6 of the SetupManual.)Screen Memory Protect has beenset to Disabled because the PTpower supply was turned OFF duringdeletion of screen data.Do not turn the PT power OFF during deletion ofscreen data.In the System Installer mode, first change thesetting for Screen Memory Protect to Enabled, thenrepeat the screen data delete operation.
(Refer toSection 6 of the Setup Manual.)Cannot input numericvaluesThe upper/lower (max./min.) limitcheck for numeric value input is ineffect.Check the screen data’s upper/lower (max./min.)limit check setting for numeric value input, andcorrect it if necessary (for numeric key type, refer topage 192; for thumbwheel type, refer to page 200).Cannot input numericvalues/character strings.Bit 5 of the PT status control area(numeral/character string input) isset to 1 (ON).Set bit 5 to 0 (OFF) (page 60).Cannot operate recipeelements using touchswitches on the PT.Interlock bit set in the recipeelements is OFF.Check the status of the interlock bit set in the recipeelements and turn it ON.Cannot change recipedata (parameters) usingtouch switch operationson the PT.Editing of records specified in therecipe data using the PT has beenset to disabled (the default setting)using the Support Tool.Recreate the screen data with the Support Tool toenable editing of specified recipe data, and thensend all the data in a single operation to the PT.Recipe data details arenot displayed on screen.Specified recipe data is not set onscreen.Recreate the recipe data on screen using theSupport Tool, and then send all the screen data in asingle operation to the PT.Window screen does notopenBit 6 of the PT status control area(PT window opening) is set to 1(ON).Set bit 6 to 0 (OFF) (page 59).Cannot switch screenswith touch switchesBit 4 of the PT status control area(PT screen switching) is set to 1(ON).Set bit 4 to 0 (OFF) (page 60).Buzzer sounds – cannotThe interlock function is set for theuse touch switches, inputs touch switch or input field and the(numeral or charactercontrolling interlock bit is OFF.string), or recipe objectsCheck the status of the corresponding interlock bitand turn it ON.The display is dim.Insufficient contrast or brightnessFor the NT31/NT31C or NT631/NT631C, use thesystem menu to increase the contrast/brightness.(Refer to section 6 of the Setup Manual.)For the NT21, use the switches on the back of thePT to increase the contrast.
(The brightness cannotbe adjusted.)Backlight defective, or its life hasexpiredFor the NT31/NT31C or NT631C, replace thebacklight.(Refer to section 6 of the Setup Manual.)For the NT21, contact your nearest OMRONrepresentative.425SectionTroubleshootingPT SymptomsCause6-1RemedyThe display is too faint.The contrast is too high.For the NT31/NT31C or NT631/NT631C, use thesystem menu to reduce the contrast.(Refer to section 6 of the Setup Manual.)For the NT21, use the switches on the back of thePT to increase the contrast.The digits in numeraldisplay come out as *.The number of digits of a numericvalue in a numeral memory tableentry exceeds the set number.• Confirm the values of the PC words allocated to thenumeral memory table entry.426• Allocate one PC word to each numeral memorytable entry.SectionResponding to Displayed Error Messages6-26-2Responding to Displayed Error MessagesWhen the PT displays an error message, find the corresponding symptoms inthe appropriate table below and respond by following the Remedy indicated inthe table.For details of the error messages displayed when using Memory Unit and corrective action to take for them, refer to Using a Memory Unit (PT models with Vjsuffix) or Using a Memory Unit (PT models without Vj suffix) in section 3 in theSetup Manual.6-2-1 Errors Occurring at Start of Operation and Their RemediesThe table below shows the errors that can occur when the power to the PT isturned ON and when operation starts, and their remedies.MessageCauseRemedy[No Comm.
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