AS Series Programming Manual * The format for the download action time: the data is stored as a binary-coded decimal. The following table lists the range _2 of values. 8. The PLC status change log SR309–SR390 SR309: The maximum number of PLC status change logs stored in SR309 is 20. Each PLC status change log occupies 4 registers. The recorded PLC status change actions are numbered, as shown in the following table. SR310: The PLC status change log pointer points to the latest PLC status change log. When the PLC status changes, the value of the PLC status change log pointer increases by one. The range of pointer values is 0–19.
For example, PLC status change log pointer points to the fourth PLC status change log when the value in SR310 is 3. The time when the PLC status change actions occur is recorded in SR311–SR390. The flowing table lists the corresponding functions of these data registers. 2-112 Action *Time when the download occurs Number number Year Month Day Hour Minute Second SR305 SR306 High byte SR306 Low byte SR307 High byte SR307 Low byte SR308 High byte SR308 Low byte 20 Function Value Year 00–99 (A.D.) Month 01–12 Day 01–31 Hour 00–23 Minute 00–59 Second 00–59 PLC status change Number PLC powered on. 1 PLC disconnected. 2 PLC starts to run. 3 PLC stops.
4 Default setting in the PLC 5 Action *Time when the PLC status change occurs Number number Year Month Day Hour Minute Second SR311 SR312 High byte SR312 Low byte SR313 High byte SR313 Low byte SR314 High byte SR314 Low byte 1 SR315 SR316 High byte SR316 Low byte SR317 High byte SR317 Low byte SR318 High byte SR318 Low byte 2 SR319 SR320 High byte SR320 Low byte SR321 High byte SR321 Low byte SR322 High byte SR322 Low byte 3 SR323 SR324 High byte SR324 Low byte SR325 High byte SR325 Low byte SR326 High byte SR326 Low byte 4 SR327 SR328 High byte SR328 Low byte SR329 High byte SR329 Low byte SR330 High byte SR330 Low byte 5