Chapter 3 Deployment CPU 21x-2BS03 Manual VIPA System 200V3-2 HB97E - CPU - RE_21x-2BS03 - Rev. 15/16AssemblyNote!Information about assembly and cabling may be found at chapter "Basicsand Assembly".Start-up behaviorWhen the CPU is delivered it has been reset. After the power supply hasbeen switched on, the CPU changes to the operating mode the operatingmode lever shows. After a STOP→RUN transition the CPU switches toRUN without program.Note!Due to a long storage of the CPU, the battery may be dischargedexcessively. Please connect the CPU at least for 24 hours to the powersupply, to achieve the full buffer capacity.The CPU switches to RUN with the program stored in the battery bufferedRAM.The accumulator/battery is automatically loaded via the integrated powersupply and guarantees a buffer for max. 30 days. If this time is exceeded,the battery may be totally discharged. This means that the battery bufferedRAM is deleted.In this state, the CPU executes an overall reset because with an emptybattery the RAM content is undefined. If a MMC with a S7PROG.WLD isplugged, program code and data blocks are transferred from the MMC intothe work memory of the CPU.If there is no MMC, the project from the internal Flash is loaded.Depending on the position of the operating mode switch, the CPU remainsin STOP respectively switches to RUN. Due to the battery error the CPUcan only boot if there was an OB81 configured. Otherwise a manual restart(STOP/RUN) respectively PG command is necessary.On a start-up with an empty battery the SF LED is on and thus points to anentry in the diagnostic buffer. Information about the Event-IDs can be foundat "VIPA specific diagnostic entries".Attention!After a power reset and with an empty battery the CPU starts with a BATerror and executes an overall reset.Turn on powersupplyBoot procedure withvalid data in theCPUBoot procedurewith empty battery