Pixsys PL260, Руководство пользователя

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The values are stored also in case of power failure thanks to a
rechargeable back-up battery. After charging, the battery stores data for
approx. 6 months
1.7.2 Memory area “special marker SM”
This area is the memory which contains all data used by the ladder
program to interact with the hardware resources of PL260. Some of this
data is initialized when starting the PLC with the default values described in
the table below. This area contains all data related to analogue inputs,
trimmers, counts and set values of encoders, and also some bits controlled
by the PLC for the ladder application as well as the settings for serial ports.
The table below includes the content of each single location of the area
“Special markers”, giving the address for Modbus protocol and the type of
operation
allowed for each location (R=reading, W=writing,
R/W=reading/writing).