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status of a marker. Example: status of marker M1 is stored on bit number 0
of word 1 in the area M. The area is composed of 8 words.
1.7.6 Area memoria “analog inputs AI”
In this memory area “analog inputs AI” the PLC stores the value which is
assumed by analog inputs. The value is rated according to min. and max.
limits which have been set as range of analog input.
1.7.7 Memory area ”timer T”
Timers are stored in this area. If timer is enabled, the value contained in
this area will increase or decrease according to type of time, with the
resolution chosen at the starting of timer.
1.7.8 Memory area “preset timer PT”
Memory area “preset timer PT” is the memory where the preset values of
timers are stored.
1.7.9 Memory area “counters C”
This memory area contains values of counters. Accordng to type of
counter, at each counting operation, the value container in this area will be
updated.
1.7.10 Memory area preset values of counters PV
In this area the preset values of conters PV are stored.
1.7.11 Memory area EEPROM
EEPROM area is the self-retaining memory to store all data which cannot
be lost even if PLC is switched-off for long periods (over 6 months). Data
stored in this area are tested at the starting of PLC to check their integrity
and in case of anomaly, the fault condition is notified (SM1.2) and the
whole area is initialized at 0 (zero). Access and writing in this area requires
longer time than any other area, therefore it is recommended not to use this
area for frequent access, but only at starting to copy the stored data , for
example in area V , and then to use these for quick access, guaranteeing a
faster program.
N.B.: EEPROM memory allows a max number of writigs for each
single location (1000000 are guaranteed). Above this number, data are
Summary of Contents for EPL101
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