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Memory structure

Memory structure

The application memory is divided into memory areas physically distributed in the internal RAM and on 1 or 2 PCMCIA memory expansion cards (2 PCMCIA cards on models 140CPU65150, 140CPU65160, 140CPU65260, 140CPU67060, 140CPU67160, 140CPU67260, 140CPU67261 and 140CPU67861 , and 1 on models 140CPU65860 and 140CPU67861 ): 1 Application data area always in internal RAM. This area is broken down into 2 types of data, to be used according to the user's habits and preferences: v Global located data, corresponding to data defined by an address (for example, %MW237) with which a symbol can be associated (for example, Counting_rejects). v Unlocated data, corresponding to data defined only by a symbol. This type of addressing removes the memory mapping management constraints because the addresses are assigned automatically. v DFB unlocated data corresponding to DFB user function blocks. The size of this object area is only limited by the size of the internal RAM physical memory available. 2 Application program and symbols area in the internal RAM or in the PCMCIA memory card (descriptor, executable code for the tasks and application symbols database) 3 Constants area in internal RAM or the PCMCIA memory card (constant words, initial values and configuration) 4 Area for storing additional data that can be used for distributed applications to store information such as production data and manufacturing recipes (only on 140CPU65150, 140CPU65160, 140CPU65260, 140CPU65860, 140CPU67060, 140CPU67160, 140CPU67260, 140CPU67261 and 140CPU67861 CPUs) According to the application memory size requirements, two memory structures are possible depending on whether the Quantum CPU has 0, 1 or 2 PCMCIA memory expansion cards: b Application in internal RAM, the application is completely loaded into the CPUs battery-backed internal RAM (2) the capacity of which depends on the CPU model. b Application in the PCMCIA card, the internal RAM is reserved for the application data. The PCMCIA memory card contains the program space (program, symbols and constants areas). Certain types of PCMCIA memory card also take the data storage area. The presence of the symbols area with the program area is optional. The fact of having the application symbols database on the PLC means that, when it is connected to an empty programming PC (with no applications), all the elements needed to debug or upgrade this PLC are available.

(1) Only with 140CPU31110, 140CPU43412U CPUs. (2) The internal RAM is backed up by a 3 V


lithium battery (installed by the user). SRAM memory expansion cards are protected by a lithium battery.

Modicon Quantum automation platform

Unity Pro standard CPUs

I/O architectures: page 2/6 I/O: page 3/2 Communication: page 5/2 Safety modules: page 6/2

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Internal RAM available Data storage PCMCIA card (slot no. 0) Located data

768 KB to 3 MB 4096 or 8192 KB

CPU with data storage memory card in slot no. 0 Program and symbols Global unlocated data and DFBs Data storage Constants

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Internal RAM available PCMCIA card (slot no. 0) Located data CPU with PCMCIA memory card in slot no. 0

768 to 7168 KB

Global unlocated data Program and symbols Constants Data storage

768 KB to 3 MB

DFB unlocated data

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Internal RAM available

548 KB to 11 MB

CPU without PCMCIA memory card Located data Global unlocated data and DFBs Program and symbols Constants Operating system (1)

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