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Memory structure Modicon Premium automation platform Unity processors 1 2 3 4 5 6 7 Processor without PCMCIA memory card Internal RAM 96 to 2048 Kb Located data Global and DFB unlocated data Program, symbols and area for online program modification Constants Processor with PCMCIA memory card in slot no. 0 Internal RAM PCMCIA card (slot no. 0) 96 to 2048 Ko 128 to 7168 Ko Located data Global unlocated data DFB unlocated data DFB unlocated data Program and symbols Constants Additional data storage Processor with data storage type memory card in slot no. 0 Internal RAM 96 to 2048 Kb Located data Unlocated data Program, symbols and area for online program modification 1 1 2 3 1 1 1 2 3 4 1 1 2 Memory structure The application memory is divided into memory areas, which are physically distributed across the internal RAM and 0, 1 or 2 PCMCIA memory extension cards: 1 The application data, which is always found in the internal RAM, is divided into two possible types: v Located data, corresponding to data defined by an address (e.g. %MW237), which can have a symbol linked to it (e.g. Counter_rejects). v Unlocated data, corresponding to data defined only by a symbol. This type of addressing eliminates the problems of memory mapping management, because addresses are assigned automatically. It also facilitates data structuring. v DFB unlocated data, corresponding to DFB user function block data. The size of this area (which is determined by the physical size of the available internal RAM) depends on the processor model, see pages 1/12 and 1/13. 2 Area in internal RAM or PCMCIA memory card for the program and symbols. If this area happens to be inside the internal RAM, it also contains the area for modifying the program in online mode (1). This area contains the program's executable binary code and IEC source code. The user selects the type of information to be stored in the PLC memory. 3 Constants area in the internal RAM or the PCMCIA memory card (slot no. 0) 4 Area for storing additional data (slot no. 0 or no. 1), e.g. for production data and manufacturing recipes Memory organization The memory will be organized in one of two ways, depending on whether the Premium processor is fitted with 0, 1 or 2 memory extension cards: b Application in internal RAM: In this case, the application is completely loaded into the processor's internal battery-backed RAM (2), the capacity of which depends on the processor model (96 Kb to 2 Mb). b Application in PCMCIA card: In this case, the internal RAM is reserved for the application data. The PCMCIA memory card (slot no. 1) contains the program space (program, symbols and constants areas) (128 Kb to 2 Mb). Certain types of PCMCIA memory card also host the data storage area (max. 6976 Kb). Symbols areas Having the symbols area in the same place as the program area is optional. However, if the application symbols database is available on the PLC, it means that, when an empty programming terminal is connected to the PLC, all the elements needed to debug or upgrade this PLC can be transferred to the terminal. Constants 3 8 9 PCMCIA data storage card (slot no. 0) 4096 or 8192 Ko Additional data storage 4 __________________________________________________________________ (1) If a PCMCIA card has been inserted, it is the memory on this memory card that will be used for the purpose of modifying the program in online mode (outside areas 2, 3 and 4 opposite). (2) The internal RAM is backed up by an optional battery (with a service life of 3 years), which is located in the power supply module (see page 2/4). 10 1 1 Presentation: page 1/4 2 1/8 Description: pages 1/5 … Characteristics: pages 1/10 … References: pages 1/12 … PCMCIA references: pages 1/22 …
Memory structure (continued) Modicon Premium automation platform Unity processors Processor with mixed type memory card in slot no. 0 and data storage type memory card in slot no. 1 (1) Internal RAM PCMCIA card (slot no. 0) 96 to 2048 Ko 128 to 7168 Ko Located data Global and DFB unlocated data Program and symbols Constants 1 1 2 3 Memory structure (continued) Extension of the data storage area Memory cards reserved for data storage (4096 or 8192 Kb) are used to: b Access the data storage area in cases where the application is fully loaded into the internal RAM. In this case, the data storage memory card is inserted into PCMCIA slot no. 0. b Free up memory to serve as additional program space when the application is on the PCMCIA card (slot no. 0). In this case, the data storage memory card is inserted into PCMCIA slot no. 1 (although the memory card in slot no. 0 can still be used for some of the data). Unity Pro programming software helps the application designer to manage the structure and organize how the memory space on the Premium PLC is occupied. 1 2 PCMCIA data storage card (slot no. 1) 4096 or 8192 Ko (1) TSX P57 20 processors and higher Additional data storage (zone A) Additional data storage (zone B) 4 4 Protecting the application Regardless of the PLC memory structure (whether the application is located in the internal RAM or on the PCMCIA card), it is possible to prevent the application from being accessed (for the purpose of reading or modifying the program) by only loading the executable code into the PLC. A memory protection bit, set in configuration mode, is also available to prevent any program modification (via the programming terminal or downloads). Program modification in online mode This function is different from previous versions of Premium PLCs (with PL7 software) in that it now allows program code and data from different parts of the application to be added or modified in a single modification session (thus making modification unified and consistent with regard to the controlled process). This increased flexibility comes at a cost in terms of the amount of program memory required. In order for the program to be modified in online mode, the amount of program memory space available must be at least equal to the combined size of all sections of the Unity Pro program affected by the single modification session concerned. 3 4 5 Depending on circumstances: b In the case of a processor with a memory extension card, there will be sufficient memory left on the card for online modification, provided that the recommendations on page 1/22 are observed. b In the case of a processor without a memory extension card, if the user wants to be able to make modifications in online mode, he or she must select a processor on the basis of the following: v The anticipated size of the application v The number and size of the program sections to be modified in online mode 6 7 Note: A memory extension card based exclusively on Flash EPROM technology (without additional SRAM) is clearly incapable of supporting online program modifications. 8 9 10 Presentation: page 1/4 Description: pages 1/5 … Characteristics: pages 1/10 … References: pages 1/12 … PCMCIA references: pages 1/22 … 1/9
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Page 9 and 10: TSX 57 2p processors and slot PLCs
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