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LOGO! Manual
A5E00067781 01
3.7 Storage Space and Size of a Circuit
A program (control program in LOGO!, circuit diagram) has
the following limitations:
The number of blocks connected in series (nesting
depth)
The storage space (use of memory by the blocks)
Memory area
You can only use a limited number of blocks for your pro-
gram in LOGO!. In addition, some blocks require extra
memory for their special functions.
The memory required for special functions is divided up
into 4 memory areas.
Par: The area in which LOGO! stores the desired val-
ues (e.g. the limit values of a counter).
RAM: The area in which LOGO! stores the current ac-
tual values (e.g. the counter status).
Timer: The area LOGO! uses for time functions such as
the off delay.
REM: The area in which LOGO! stores actual values
that have to be retained (e.g. the count value of an op-
erating hours counter). In blocks with selective use of
the retentive feature, this memory area is only used if
the retentive feature is switched on.
Resources available in LOGO!
The maximum amount of resources that can be occupied
by a program in LOGO! is as follows:
Blocks Par RAM Timer REM Markers
56 48 27 16 15 8
LOGO! monitors memory utilization, and offers in the func-
tion lists only those functions for which there is still actually
enough memory space available.
Pro
rammin
LOGO!
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