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4.2.3 Memory managementThe CPU has an integrated memory. Information about the capacity of the memory maybe found at the front of the CPU. The memory is divided into the following parts:n Load memory 8Mbyten Code memory (50% of the work memory)n Data memory (50% of the work memory)n Work memory 4Mbyte– There is the possibility to extend the work memory to its maximum printedcapacity 8Mbyte by means of a memory extension card.4.2.4 Slot for storage mediaAt this slot the following storage media can be plugged:n SD respectively MCC (Multimedia card)– External memory card for programs and firmware.n MCC - Memory configuration card– External memory card (MMC) for programs and firmware with the possibility tounlock additional work memory.– The additional memory can be purchased separately.Ä Chapter 5.17 ‘Deploy-ment storage media - MMC, MCC’ on page 71– To activate the corresponding card is to be installed and an Overall reset is to beestablished.Ä Chapter 5.14 ‘Overall reset’ on page 674.2.5 Battery backup for clock and RAMA rechargeable battery is installed on every CPU to safeguard the contents of the RAMwhen power is removed. This battery is also used to buffer the internal clock. Therechargeable battery is maintained by a charging circuit that receives its power from theinternal power supply and that maintain the clock and RAM for a max. period of 30 days.– Please connect the CPU at least for 24 hours to the power supply, sothat the internal accumulator/battery is loaded accordingly.– Please note that in case of repeated discharge cycles (charging/buffering) can reduce the buffer time continuously. Only after acharging time of 24 hours there is a buffer for max. 30 days.CAUTION!– After a power reset and with an empty battery the CPU starts with aBAT error and executes an overall reset. The loading procedure is notinfluenced by the BAT error.– The BAT error can be deleted again, if once during power cycle thetime between switching on and off the power supply is at least 30sec.and the battery is fully loaded. Otherwise with a short power cycle theBAT error still exists and an overall reset is executed.MemoryVIPA System 300S+Hardware descriptionStructure > Battery backup for clock and RAMHB140 | CPU | 317-2AJ23 | en | 17-2530 |
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