2-172.6 Calendar TimerIf a backup battery is installed in the FP∑, the clock/calendar function can be used. This funcation cannotbe used without a backup battery.Example: <5.7 Installation and setting of backup battery>2.6.1 Area for Clock/Calendar FunctionWith the clock/calendar function, data indicating the hour, minute, second, day, year and otherinformation stored in the special data registers DT90053 to DT90057 can be read using the transmissioninstruction and used in sequence programs.Special dataRegister No. Upper byte Lower byte Reading WritingDT90053 Hour dataH00 to H23Minute dataH00 to H59 Available Not availableDT90054 Minute dataH00 to H59Second dataH00 to H59 Available AvailableDT90055 Day dataH01 to H31Hour dataH00 to H23 Available AvailableDT90056 Year dataH00 to H99Month dataH01 to H12 Available AvailableDT90057 - Day-of-the-week dataH00 to H06 Available Available2.6.2 Setting of Clock/Calendar FunctionThere are two ways to set the clock/calendar function, as described below.Setting using FPWIN GR1. Press the [CTRL] and [F2] keys at the same time, to switch to the [Online] screen.2. Select “Set PLC Date and Time” under “Tool” on the menu bar.Set PLC Date and Time dialog boxThe above steps display the “Set PLC Date and Timedialog box” shown at the left. Input the date and time, andclick on the “OK” button.Setting and changing using program1. The values written to the special data registers DT90054 to DT90057, which are allocated as theclock/calendar setting area, are sent.2. A value of H8000 is written to DT90058.Note) The value can be sent using the differential instruction “DF”, or by changing H8000 to H0000.
