Pixsys TD320, Руководство пользователя

Страница: 42 / 75

42
The area of memory for preset timer PT is composed of
128
words
and contains the values of activation of the contacts
(preset) of the respective timers.
The areas are organized in signed words, thus the resolution of
the timer and the preset timer is 16 bits (+32767).
5.9 Area of Counters C and Preset Counters PV
The memory area for counters C is composed of
64 words
. If a
counter is enabled, the variation of the contents of the memory
area is regulated by the type of counter.
The memory area for preset counters PV is composed of
64
words
and contains the values of activation of the (preset)
contacts of the respective counters.
The areas are organized in words, thus the resolution of the
counters and preset counters is 16 bits (from -32768 to +32767).
5.10 Area of Bistable Relay B
The area of memory for bistable relay B is composed of
128 bits
.
It is organized by bits, thus each bistable relay is individualized by
a single bit.
5.11 Area of EEProm
The area of memory EEProm is composed of
1000 words
. This
memory is storage for data that must be maintained even if the
TD320 remains off for very long periods (over 6 months). The data
saved in this area are in fact tested at startup to verify their
integrity, and any anomalies are signalled by activating the bit
SM1.2
, causing the initialization of the entire area to 0.
Access and writing to this area require a time significantly longer
than any other (order of 30/40 mS), thus it is advisable not to use it
for continual access (there is also a limit to the number of times
that an EEProm cell can be written to, of an order of 1,000,000
times), but only to copy at startup the data stored here, for