Technical information

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Memory structure
Modicon M580 automation
platform
Processor modules
Write-protect switch
Program
Data
Application
program
%MW backup
Saved data
Persistent memory
M580 processor
Internal application RAM
Modicon M580 application storage
Optional memory card
Memory structure
Internal memory capacity
The internal application RAM of Modicon M580 processors stores and executes the
application program. This RAM has no battery backup, which means data could be
lost in the event of a power brake. To avoid data loss, the application can be backed
up in the persistent memory. The internal memory provides a maximum capacity of
16 MB for memory program, 2,048 KB for data, and 4 GB for data storage.
The internal persistent memory is used by the rmware to register:
b the value of application variables
b the system state
b application backup
b a copy of %MW values
An optional memory card, BMXRMS004GPF, is used for application backup and
data storage. It is formatted by Schneider Electric.
BMXRMS004GPF SD memory card
Modicon M580 processors support an optional 4 GB memory card
BMXRMS004GPF. The SD memory card is of ‘‘industrial grade’’ and formatted for
use with Modicon M580 only. The Modicon M580 does not support memory cards
from Modicon M340. This card withstands operating temperatures of - 40 to 85 ºC/
- 40 to 185 °F and has 10 years of le retention capacity.
Unity Pro programming software helps the application designer manage the
structure and memory space of the Modicon M580 automation platform.
Protecting the application
If necessary, it is possible to limit access to the application (in terms of reading and
modifying the program) by only loading the executable code in the PLC.
Additionally, a memory protection bit, set in conguration mode, is also available to
help prevent any program modication (via the programming terminal or
downloading).
The user has function blocks for protecting know-how by means of a signature that
can be loaded and stored in the M580 processor module’s Flash memory card
(code not executed if the signature is not present).
Modifying the program in online mode
As with the Modicon Premium and Quantum platforms (with Unity Pro software), the
online program modication function is available on the Modicon M580 automation
platform. It has the option of adding or modifying the program code and data in
different places in the application in a single modication session (thus helping to
ensure that modication is homogenous and consistent with the controlled
process). A dedicated memory area of the application internal RAM authorizes
these program modication or addition sessions while complying with the
recommendation to structure the application program in several, reasonably-sized
sections.
The CCOTF (Change Conguration On The Fly) function is used to add or remove
discrete or analog I/O modules to/from a Modicon M580 CPU in a remote I/O drop in
RUN mode. It enables Ethernet RIO drops to be added in RUN mode. The addition
of a complete M580 Ethernet RIO drop in RUN mode requires Unity Pro V8.0 or
higher on BMEP581020, BMEP582020, BMEP582040, BMEP583020,
BMEP583040, BMEP584020, and BMEP584040 processors.
The CCOTF function avoids interrupting processes and helps to reduce production
costs. It also enables the conguration parameters of pre-existing and new Modicon
M580 analog and discrete I/O modules to be modied online in a remote I/O drop.
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