Automation platform Modicon Premium - Schneider Electric

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Memory structure
Processor without PCMCIA memory card
Internal RAM
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Presentation:
page 1/4
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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
PCMCIA data
storage card
(slot no. 0)
96 to 2048 Kb
4096 or 8192 Ko
Located data
Unlocated data
Program, symbols and
area for online program
modification
Constants
Additional data storage
Description:
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Modicon Premium
automation platform
Unity processors
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.
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(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) .
Characteristics:
pages 1/10 …
References:
pages 1/12 …
PCMCIA references:
pages 1/22 …